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This scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions that are true to the original work.

This scarce antiquarian book is a facsimile reprint of the original. Due to its age, it may contain imperfections such as marks, notations, marginalia and flawed pages. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions that are true to the original work.

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Excerpt from Cave Vertebrates of America: A Study in Degenerative EvolutionA cave is a unit of environment so well circumscribed and of such simplicity that we may know its contents, its elements, and its conditions nearly as well as the experimental zoologist knows the contents and conditions of his aquarium. These contents and conditions are of rare uniformity, changing but little from day to night, from season to season, or from decade to d...

Excerpt from The American CharacidaeDepth 4 or nearly 4, the greatest depth just behind pectorals, then tapering gradually to caudal. The fontanel, in the long, slender ones with a typically colored caudal, is narrower than in the others. Lateral line 35 or 36.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical wo...

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Excerpt from Fishes of Western South America: I. The Intercordilleran and Amazonian Lowlands of Peru, II. The High Pampas of Peru, Bolivia, and Northern Chile, With a Revision of the Peruvian Gymnotidae, and of the Genus OrestiasThe present report had its inception as a proposed Part II of The Fishes of Northwestern South America. Part I consisted of the studies made by C. H. Eigenmann, Arthur W. Henn, Charles E. Wilson, and others upon the fi...

Excerpt from Fishes of Western South America: I. The Intercordilleran and Amazonian Lowlands of Peru, II. The High Pampas of Peru, Bolivia, and Northern Chile, With a Revision of the Peruvian Gymnotidae, and of the Genus OrestiasThe present report had its inception as a proposed Part II of The Fishes of Northwestern South America. Part I consisted of the studies made by C. H. Eigenmann, Arthur W. Henn, Charles E. Wilson, and others upon the fi...

Excerpt from The Pygidiidae, a Family of South American CatfishesHead ¿at rounded, eyes small, superior, covered by the skin. Head times in length to basis of caudal fin. Depth at D. I. One-half length to basis pectoral fin, width of head two-thirds the same dis tance. Inter-orbital width times in length of head. Maxillary and external mental barbels extending beyond basis of pectoral, inner mental barbel one-half the same. Radii D. 7, P. 8, V...