The Lymnæidæ of North and Middle America: Recent and Fossil

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The Academy, 1911 - 539 páginas
 

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Página 114 - The Invertebrata of the Laramie and Cretaceous Rocks of the vicinity of the Bow and Belly rivers and adjacent localities in the North-west Territory J
Página 488 - Descriptions of Twelve New Species of Uniones and Other Freshwater Shells of the US Proc.
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Página 469 - Notes on a Collection of Mollusks from the Vicinity of Alpena, Michigan. Trans. Acad. Sci. St. Louis, XVI, pp.
Página 48 - That it cannot take all the air it requires in this manner is shown by the bottle experiments mentioned above. "Continuing this line of observations, two similar vessels were selected, in each of which six snails were placed. One vessel was filled with fresh spring water and the other with water which had been boiled in order to drive off all the free air contained in it, before cooling in a sealed flask to prevent the ingress of fresh oxygen from the atmosphere. Undoubtedly much air was absorbed...
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Página 479 - DEKAY, JAMES E. 1839. Catalogue of the Animals belonging to the State of New York, as Far as They have been Figured and Described.
Página 231 - Lymnaeas, a fact attested by the many rest varices observed on the shell of large individuals. In these dry ponds living specimens may frequently be found by digging into the mud, leaves and other debris. In Wisconsin, caperata has been found almost invariably in small woodland pools which become dry in summer and fall, or in small streams which become wholly or partially dry.

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