. Biology in America. Biology. ^- ,â 'â /,. â¢-'."â .'."â 'A'.k'. .'.'-'VJi/,'/- t.' â '' â â¢'â¢. A. The Shark Cestracion From Pirsson and Schuchert, after Gannaii. B. The Crossopterygian Polypterus From Dean, '' Fishes, Living and Fossil.'' C. The New Zealand Lizard IIatteria From Gadow, "Amphibia and Eeptiles, The Cambridge Natural His- tory. '' Band C hy permission of the Macmillan Company. Copy furnished by Conrad Lantern Slide Company, Chivago. Other relatives of the early sharks were the Crossoptery- gians, whose descendants are found today in the Nile, Niger and other Af
. Biology in America. Biology. ^- ,â 'â /,. â¢-'."â .'."â 'A'.k'. .'.'-'VJi/,'/- t.' â '' â â¢'â¢. A. The Shark Cestracion From Pirsson and Schuchert, after Gannaii. B. The Crossopterygian Polypterus From Dean, '' Fishes, Living and Fossil.'' C. The New Zealand Lizard IIatteria From Gadow, "Amphibia and Eeptiles, The Cambridge Natural His- tory. '' Band C hy permission of the Macmillan Company. Copy furnished by Conrad Lantern Slide Company, Chivago. Other relatives of the early sharks were the Crossoptery- gians, whose descendants are found today in the Nile, Niger and other African rivers. In the arrangement of the dermal head plates they are suggestive of the Stegocephala or extinct amphibians which flourished in the Carboniferous or coal-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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