. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. VERTE BEATA. 323 bones, united to the expanded spines of the vertebrae and to the ribs, making the walls of the carapace. The ven- tral pieces form the plastron, or ster- All are toothless. There are always four stout legs; and the order furnishes the only examples Of Verte- Fig. 302.—Box-tortoise (Cistudo Virginea). United brates lower than states- Birds that really walk, for Lizards and Crocodiles wrig- gle, and drag the body along. There are no
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. VERTE BEATA. 323 bones, united to the expanded spines of the vertebrae and to the ribs, making the walls of the carapace. The ven- tral pieces form the plastron, or ster- All are toothless. There are always four stout legs; and the order furnishes the only examples Of Verte- Fig. 302.—Box-tortoise (Cistudo Virginea). United brates lower than states- Birds that really walk, for Lizards and Crocodiles wrig- gle, and drag the body along. There are no teeth, but a horny beak. The eggs are covered with a calcareous shell'. The Sea-turtles, as the edible Green Turtle and the Hawk's-bill Turtle, which furnish the " tortoise - shell" of commerce, have the limbs converted into paddles. The fresh-water forms, represented by the Snapping Turtle {Chelydrd), are amphibious, and have palmated feet. Land Tortoises (Testudo) have short, clumsy limbs, fitted for slow motion on the land; the plastron is very broad, and the carapace is arched (while it is flattened in the aquatic species), and head, legs, and tail can be drawn within it. The land and marine species are vegetable-feeders; the others, carnivorous. 4. Crocodilia, the highest and largest of Reptiles, have also two exoskeletons—one of horny scales (epidermal), and another of bony plates (dermal). The bones of the skull are firmly united, and furnished with numerous teeth, im- planted in distinct sockets. The lower jaw extends back of the cranium. The heart has four cavities, but the pul- monary artery and aorta communicate with each other, so that there is a mixture of venous and arterial blood. They have external ear-openings, closed by a flap of the. 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 w
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
