scholarly journals V.—On a new Trilobite from the Dictyonema-shales of the Malvern Hills

1902 ◽  
Vol 9 (2) ◽  
pp. 70-73 ◽  
Author(s):  
Theodore T. Groom

In the collection made by the late Dr. Grindrod, now in the Geological Museum at Oxford, there is a minute species of trilobite, represented by two specimens, obtained from the Dictyonema-shales of the Malverns. This form was referred by Dr. Callaway to Shumardia (Conophrys) Salopiensis, Call.; but a careful study of the two specimens, aided by the removal of a small fragment of shale which partly concealed the more complete example, has shown the distinctness of the trilobite from Shumardia, and from any other genus known to the writer. Owing to the kindness of Professor Sollas I have been enabled to make a thorough examination of the specimens. The preservation is fairly good, but much of the actual test has been lost, and both fossils are largely in the form of internal casts. In the more complete but somewhat smaller example, which may be taken as the type-specimen, the whole trilobite is preserved (Fig. 3); in the second specimen little more than the thorax and pygidium is seen (Fig. 4).

Phytotaxa ◽  
2020 ◽  
Vol 433 (4) ◽  
pp. 265-276
Author(s):  
MARILIA S. WÄNGLER ◽  
THIAGO E. C. MENEGUZZO ◽  
CÁSSIO VAN DEN BERG ◽  
JOSÉ FERNANDO A. BAUMGRATZ

Understanding the composition of the type specimen of Pseudolaelia corcovadensis is very important for establishing its taxonomic circumscription. This specimen, originally collected on the Morro do Corcovado in the municipality of Rio de Janeiro, within the Atlantic Forest biome, were mixed with those of another species of Pseudolaelia. A careful study of the specimens has made it possible to propose the lectotypification of P. corcovadensis and determine the identity of the mixed specimen, which corresponds to P. vellozicola, a similar species. The morphological description and geographical distribution, now more restricted, are presented for P. corcovadensis, and the range of P. vellozicola is established as more extensive than previously understood.


2009 ◽  
Vol 28 (2) ◽  
pp. 189-190
Author(s):  
M. A. Kaminski ◽  
D. B. Lazarus

Abstract. INTRODUCTIONThe Ehrenberg collection of microfossils in the Natural History Museum, Berlin contains the original reference material for a single genus of agglutinated foraminifera – Bolivinopsis Yakovlev, 1891. Among the foraminiferal specimens preserved in the collection, a single specimen was selected and illustrated by Ehrenberg (1854) as Spiroplecta rosula. This species was subsequently designated by Kisselman (1964) as the senior synonym of Bolivinopsis capitata Yakovlev, 1891, making it the type species of Bolivinopsis by virtue of synonymy. According to Kisselman (1964), the type specimens of B. capitata were deposited in the Central Geological Museum in St Petersburg, and were lost during the war. Indeed, the name B. capitata is not used in the Soviet literature, and such forms are consistently attributed to B. rosula. As part of the work undertaken for a Catalogue of Agglutinated Foraminiferal Genera, we undertook a search of the Ehrenberg Collection in order to establish the status of the type specimen(s) of Spiroplecta rosula.MATERIAL AND METHODSThe Ehrenberg collection of microfossils at the Museum für Naturkunde in Berlin consists of innumerable specimens embedded in Canada Balsam mounted on small mica disks that served as microscope slides. Small paper rings pressed onto the surface of the disks were used by Ehrenberg to mark specimens of importance, such as illustrated in Ehrenberg’s (1854) book Mikrogeologie. A catalogue of the collection was compiled originally by Ehrenberg’s daughter Clara and has been supplemented by new collection databases. We used these sources to locate and examine all the micas from the . . .


Author(s):  
A.J. Tousimis ◽  
T.R. Padden

The size, shape and surface morphology of human erythrocytes (RBC) were examined by scanning electron microscopy (SEM), of the fixed material directly and by transmission electron microscopy (TEM) of surface replicas to compare the relative merits of these two observational procedures for this type specimen.A sample of human blood was fixed in glutaraldehyde and washed in distilled water by centrifugation. The washed RBC's were spread on freshly cleaved mica and on aluminum coated microscope slides and then air dried at room temperature. The SEM specimens were rotary coated with 150Å of 60:40- gold:palladium alloy in a vacuum evaporator using a new combination spinning and tilting device. The TEM specimens were preshadowed with platinum and then rotary coated with carbon in the same device. After stripping the RBC-Pt-C composite film, the RBC's were dissolved in 2.5N HNO3 followed by 0.2N NaOH leaving the preshadowed surface replicas showing positive topography.


2008 ◽  
Vol 17 (3) ◽  
pp. 87-92
Author(s):  
Leonard L. LaPointe

Abstract Loss of implicit linguistic competence assumes a loss of linguistic rules, necessary linguistic computations, or representations. In aphasia, the inherent neurological damage is frequently assumed by some to be a loss of implicit linguistic competence that has damaged or wiped out neural centers or pathways that are necessary for maintenance of the language rules and representations needed to communicate. Not everyone agrees with this view of language use in aphasia. The measurement of implicit language competence, although apparently necessary and satisfying for theoretic linguistics, is complexly interwoven with performance factors. Transience, stimulability, and variability in aphasia language use provide evidence for an access deficit model that supports performance loss. Advances in understanding linguistic competence and performance may be informed by careful study of bilingual language acquisition and loss, the language of savants, the language of feral children, and advances in neuroimaging. Social models of aphasia treatment, coupled with an access deficit view of aphasia, can salve our restless minds and allow pursuit of maximum interactive communication goals even without a comfortable explanation of implicit linguistic competence in aphasia.


2020 ◽  
Vol 142 ◽  
pp. 83-97
Author(s):  
A Chandran ◽  
PU Zacharia ◽  
TV Sathianandan ◽  
NK Sanil

The present study describes a new species of myxosporean, Ellipsomyxa ariusi sp. nov., infecting the gallbladder of the threadfin sea catfish Arius arius (Hamilton, 1822). E. ariusi sp. nov. is characterized by bivalvular, ellipsoid or elongate-oval myxospores with smooth spore valves and a straight suture, arranged at an angle to the longitudinal spore axis. Mature myxospores measured 10.1 ± 0.8 µm in length, 6.8 ± 0.5 µm in width and 7.7 ± 0.7 µm in thickness. Polar capsules are equal in size and oval to pyriform in shape. They are positioned at an angle to the longitudinal myxospore axis and open in opposite directions. Polar capsules measured 2.8 ± 0.3 µm in length and 2.5 ± 0.4 µm in width; polar filaments formed 4-5 coils, and extended to 32.2 ± 2.1 µm in length. Monosporic and disporic plasmodial stages attached to the wall of gallbladder. Molecular analysis of the type specimen generated a 1703 bp partial SSU rDNA sequence (MN892546), which was identical to the isolates from 3 other locations. In phylogenetic analyses, genus Ellipsomyxa appeared monophyletic and E. ariusi sp. nov. occupied an independent position in maximum likelihood and Bayesian inference trees with high bootstrap values. The overall prevalence of infection was 54.8% and multiway ANOVA revealed that it varied significantly with location, year, season, sex and size of the fish host. Histopathological changes associated with E. ariusi sp. nov. infection included swelling, vacuolation and detachment of epithelial layer, reduced mucus production and altered consistency and colour of bile. Based on the morphologic, morphometric and molecular differences with known species of Ellipsomyxa, and considering differences in host and geographic locations, the present species is treated as new and the name Ellipsomyxa ariusi sp. nov. is proposed.


2015 ◽  
Vol 42 (2) ◽  
pp. 226-235 ◽  
Author(s):  
G. N. H. Waller

Eight species of mesoplodont whales (genus Mesoplodon Gervais, 1850) named during the nineteenth century are based on valid descriptions. A checklist with the original description and type material for each of these species is provided. Additional data given may include type locality and illustrative sources, type material holding institution and type registration number(s). The only type specimen for which a record of external morphology was published relates to the 1803 stranding of Sowerby's beaked whale (Mesoplodon bidens).


2013 ◽  
Vol 40 (1) ◽  
pp. 149-156 ◽  
Author(s):  
E. Charles Nelson

Archibald Menzies landed twice at Chatham Bay, Isla del Coco, in January 1795. A small number of his herbarium specimens are extant, including the type specimen of Callicosta rugifolium (Bryophyta; Daltoniaceae) and perhaps also that of Octoea insularis (Angiospermae; Lauraceae), indicating that he was probably the first to make scientific collections on the island.


Author(s):  
Adam Schoene

Where Adam Smith’s The Theory of Moral Sentiments (1759) extends the domain of spectatorship beyond the ocular realm and claims that we must become the impartial spectators of our own character and conduct, Jean-Jacques Rousseau’s Rousseau juge de Jean-Jacques, Dialogues (1776) also attempts to probe beyond the visual surface to examine through careful study the constitution of another, who is actually himself. This chapter traces a Smithian sentiment in the radical division of the self dramatized in Rousseau’s fictional autobiographical Dialogues, emphasizing Rousseau’s attempt to liberate his own gaze and render an unbiased judgment upon himself. Although Rousseau does not write in direct discourse with Smith, he applies a strikingly similar rhetorical device to the spectator within the dialogic structure of his apologia. Reading Rousseau alongside Smith resituates the Dialogues not as a work of madness, as it has frequently been interpreted, but rather as an unrelenting struggle for justice.


2016 ◽  
Vol 7 (1) ◽  
pp. 102-122
Author(s):  
Cecilia Wassén

Scholars usually take for granted that the sectarian members of the Qumran movement ate their common meals in full purity at a level that is often compared to that of the priests serving in the temple. This assumption rests on the interpretation of hatohorah, “the purity,” as pertaining to common meals. But a careful study of a range of texts, including the important Tohorot A, leads to a more nuanced picture. Accordingly, it is important to distinguish between the common, everyday meals of the movement and the special meals. Whereas a mild level of impurity of the participants was accepted at the ordinary type of communal meals, special meals required purity. Even at these pure meals, there were variations concerning the required level of purity depending on the occasion.


2018 ◽  
pp. 16-31
Author(s):  
Tatyana Denisova

For the first time in Russian African studies, the author examines the current state of agriculture, challenges and prospects for food security in Ghana, which belongs to the group of African countries that have made the most progress in achieving the Sustainable Development Goals (SDGs). The SDGs are a collection of 17 global goals adopted by UN member states in 2015 with a view of achieving them by 2030. The SDGs include: ending poverty in all its forms everywhere (Goal 1); ending hunger, achieving food security and improved nutrition, and promoting sustainable agriculture (2); ensuring healthy lives and promoting well-being for all at all ages (3), etc. These goals are considered fundamental because the achievement of a number of other SDGs – for example, ensuring quality education (4), achieving gender equality (5), ensuring sustainable consumption and production patterns (12), etc. – largely depends on their implementation. Ghana was commended by the world community for the significant reduction in poverty, hunger and malnutrition between 2000 and 2014, i.e. for the relatively successful implementation of the first of the Millennium Development Goals (MDGs, 2000–2015) – the eradication of extreme poverty and hunger. However, SDGs require more careful study and planning of implementation measures. In order to achieve the SDGs, the Government of Ghana has adopted a number of programs, plans and projects, the successful implementation of which often stumbles upon the lack of funding and lack of coordination between state bodies, private and public organizations, foreign partners – donors and creditors, etc., which are involved in the processes of socioeconomic development of Ghana. The author determines the reasons for the lack of food security in Ghana, gives an assessment of the state of the agricultural sector, the effective development of which is a prerequisite for the reduction of poverty and hunger, primarily due to the engagement of a significant share (45%) of the economically active population in this sector. The study shows that the limited growth in food production is largely due to the absence of domestic markets and necessary roads, means of transportation, irrigation and storage infrastructure, as well as insufficient investment in the agricultural sector, rather than to a shortage of fertile land or labor.


Sign in / Sign up

Export Citation Format

Share Document