File:The chordates (1950) (20423345938).jpg

Title: The chordates
Identifier: chordates00rand (find matches)
Year: 1950 (1950s)
Authors: Rand, Herbert W. (Herbert Wilbur), 1872-1960
Subjects: Chordata
Publisher: Philadelphia : Blakiston
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Aim and Method of Comparative Anatomy 369
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Fig. 293. Convergence. Adaptation for swimming in fish, reptile, and mammal. (Top) Shark, a fish. (Center) Ichthyosaur, an extinct reptile. (Bottom) Porpoise, a modern mammal. (Courtesy, American Musum of Natural History, New York.) to a single organ instead of involving the whole body. Stiff, sharp spines, such as are produced by the skin of our common porcupine, occur also on the European hedgehog and on the "spiny anteater" of the Australian region—animals genetically very far apart (Fig. 294). The "flying membrane," a broad fold of skin extending along the side of the body from foreleg to hindleg, is similarly developed in flying squirrels (rodents) and in flying phalangers (Australian marsupials), and reaches its extreme differentiation in bats (Fig. 547). The East Indian "flying lemur" (Galeopithecus: affinities uncertain) has flying membranes very much like those of the squirrel (Fig. 593). The wings of the pterodactyls, extinct flying reptiles, were similar to those of

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