File:Comparative zoology, structural and systematic - for use in schools and colleges (1883) (20671111295).jpg

Title: Comparative zoology, structural and systematic : for use in schools and colleges
Identifier: comparativezool00orto (find matches)
Year: 1883 (1880s)
Authors: Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950
Subjects: Zoology; Anatomy, Comparative; Physiology, Comparative
Publisher: New York : Harper & Bros.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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322 COMPAKATIVE ZOOLOGY. loosely tied together by ligaments. Nearly all have a breast-bone, and the eyes (save in the Gecko) are fur- nished with movable lids. In the common Lizards and Chameleon, the tongue is extensile. The tail is usually long, and in some cases each caudal vertebra has a divis- ion in the middle, so that the tail, when grasped, breaks off at one of these divisions. The Chameleon has a pre- hensile tail. The Iguana is distinguished by a dewlap on the throat and a crest on the back. Except some of the Monitors of the Old World, all the Lizards are terrestrial. 3. Chelonia, or Tortoises and Turtles, are of anomalous structure. The skeleton is external, so as to include not only all the viscera, but also the whole muscular system, which is attached internally; and even the limbs are
Text Appearing After Image:
Fig. 301.—Hawk's-bill Turtle (Eretmochelys imbricata). Tropical Atlantic. inside, instead of outside, the thorax. The exoskeleton unites with the endoskeleton, forming the carapace^ or case, in which the body is enclosed. The exoskeleton con- sists of horny plates, known as "tortoise-shell" (in the soft Tortoises, Trionyx, this is wanting), and of dermal

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