Identifier: outlinesofcompar00agas (find matches)
Title: Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges
Year: 1870 (1870s)
Authors: Agassiz, Louis, 1807-1873 Gould, Augustus A. (Augustus Addison), 1805-1866 Wright, Thomas, 1809-1884
Subjects: Physiology, Comparative Zoology
Publisher: London : Bell & Daldy
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image:
AGES OF NATURE. 405 sidered as the prototypes of the whales, having, like them,limbs in the form of oars. The Plesiosaurus (fig. 383) agrees,in many respects, with the Ichthyosaurus in its structure,but is easily distinguished by its long neck, which somewhatresembles the neck of some aquatic birds. A still more ex-traordinary reptile is the Pterodactylus (fig. 384), with itslong fingers, like those of a bat, for the support of wings, bywhich it was enabled to fly.
Text Appearing After Image:
Fig. 384.—Pterodactylus Gratsirostris*—Goldfuss* § 674. It is also in the upper stages of this formation thatwe meet with the skeletons of tortoises. Here also we findthe remains of several families of insects (Lidellula, Coleop-tera, Ichneumons, $-c.) Finally, in these same stages, the slatesof Stonesfield, the first traces of mammals are found, namely,\he jaws and teeth of animals belonging to extinct forms of 406 GEOLOGICAL SUCCESSION OF ANIMALS. Marsupialia, and having some resemblance to the opossum(fig. 385).

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