Brief contributions to zoology from the Museum of Yale College; No. XVII, Descriptions of North American fresh-water leeches

The present paper has been prepared in the course of work at the University of Illinois for the degree of master of science in zoology. In addition to extensive collections of Entomostraca made at the Biological Station of the University of Illinois, situated at Havana, on the Illinois River, I have been able, through the kindness of Dr. S. A. Forbes, to examine all the accumulations in this group made by the Illinois State Laboratoryof Natural History during the last twenty years,and covering a territory little less than continental.

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On certain conditions attending the geological descent of some North American types of fresh-water gill-bearing mollusks

American Journal of Science ◽

10.2475/ajs.s3-23.137.382 ◽

1882 ◽

Vol s3-23 (137) ◽

pp. 382-386

Author(s):

C. A. White

Keyword(s):

Fresh Water ◽

North American

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A NEW WATER-BUG FROM CANADA

The Canadian Entomologist ◽

10.4039/ent2956-3 ◽

1897 ◽

Vol 29 (3) ◽

pp. 56-56

Author(s):

William H. Ashmead

Keyword(s):

New Species ◽

Fresh Water ◽

North American ◽

South American ◽

The South ◽

Water Stream ◽

The North ◽

Water Species

The interesting new species of water-bug described below was received some time ago from Abbé P. A. Bégin, of Sherbrooke, Canada. It was captured swimming on a fresh-water stream some little distance above Sherbrooke, and is of more than ordinary interest, from the fact that it belongs to the genus Halobatopsis, Bianchi, a genus not yet recognized in the North American fauna, and only recently characterized, being based upon the South American Halobates platensis, Berg., also a fresh-water species.

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The Geology and Bottom Deposits of Lake Tystrup Sø, Zealand

Danmarks Geologiske Undersøgelse II. Række ◽

10.34194/raekke2.v76.6865 ◽

1950 ◽

Vol 76 ◽

pp. 1-52

Author(s):

Kaj Hansen

Keyword(s):

Fresh Water ◽

North American ◽

Systematic Investigation ◽

Geological Survey ◽

Terra Incognita ◽

Bottom Deposits ◽

Marl Lake ◽

The University

While there is an abundant literature on the sediments of Swedish, German and North American lakes, the bottom deposits of Danish lakes are nearly terra incognita. In spite of the paper on Lake Marl, Lake Ores and Lake Gytje published in 1901 by Wesenberg Lund a more systematic investigation has long been needed. In 1942 I therefore began an investigation of the sediments in Lake Tystrup Sø, Zealand (Sjælland), in co-operation with the Laboratory for Fresh Water Biology of the University of Copenhagen, and using the laboratory's annex in Suserup woods as a base. It is my aim to continue such investigations in other Danish lakes. It is my pleasant duty to thank the Director of the Laboratory for Fresh Water Biology, Prof. Kai Berg for that friendship which he has shown me during the investigation, both in the laboratory in Hillerød, and in Suserup. I also thank the Geological Survey of Denmark because it has agreed to include this paper in its publications, and lastly I thank the Carlsberg Fond who have subsidized the publication.

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