Image from page 362 of “Zöology; a textbook for colleges and universities” (1920) – more Sharks goodness curated by www.SardineRunPE.co.za
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Title: Zöology; a textbook for colleges and universities
Year: 1920 (1920s)
Authors: Cockerell, Theodore D. A. (Theodore Dru Alison), 1866-1948
Publisher: Yonkers-on-Hudson, N. Y., World book company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library
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Text Appearing Before Image:
Photograph from Am. Mus. Natural HistoryFIG. 129. Garpike. FISHES 347
Text Appearing After Image:
Photograph from Am. Mus. Natural HistoryFIG. 130. Group showing nesting habits of the bowfin. scales, though without the well-defined peg-and-socketarrangement. It is to this type that the term ganoid has been more especially restricted in recent years. The bowfin (Amia caka), also of the MississippiValley, is actually nearer to the garpike than the latteris to Polypterus, though its scales are not ganoid. It is,however, a very.distinct and isolated type, and althoughthe scales superficially resemble those of many of thehigher fishes, the fine fibrilloe or threads composing thebasal part run lengthwise as they do in the lung-fishes. The sturgeons (Chondrostei) constitute another iso- sturgeonslated type surviving from ancient times. They havelarge, bony plates on the body, and the tail is heterocer-cal- – that is to say, bends upward at the end, carryingthe fin on the lower side. This is a feature also ob-served in the sharks, and less conspicuously in thebowfin and garpike. It will b
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