. Elements of zoölogy. Zoology. 218 BACKBONED ANIMALS. The Double - Walkers (Amphisbcenidce) (Fig. 262) are found in tropical America, often in the nests of ants. They move in either direction with equal ease. Thirteen species are known in Asia, Africa, and South FlG. 262. —Amphisbcena fuliginosa. Order III. Turtles (Clielonia). General Characteris- tics).—The turtles (Fig. 263) are distinguished by the shell or box-like covering that envelops them. The upper part forms the carapace, r, the lower the plastron, //, the two constituting a covering into which the head, tail, and limbs c
. Elements of zoölogy. Zoology. 218 BACKBONED ANIMALS. The Double - Walkers (Amphisbcenidce) (Fig. 262) are found in tropical America, often in the nests of ants. They move in either direction with equal ease. Thirteen species are known in Asia, Africa, and South FlG. 262. —Amphisbcena fuliginosa. Order III. Turtles (Clielonia). General Characteris- tics).—The turtles (Fig. 263) are distinguished by the shell or box-like covering that envelops them. The upper part forms the carapace, r, the lower the plastron, //, the two constituting a covering into which the head, tail, and limbs can be more or less withdrawn. The generally arched carapace is formed by the greatly expanding ribs, these and the vertebrae being fixed and immovable. The plas- tron is generally considered a greatly expanded sternum.* The outer surface of the shell is made up of scales or plates, or a leathery substance, as in the case of the soft- shell tortoise. The jaws are toothless, being armed with a horny beak, as in the birds. The eyes have three lids ; * Some naturalists consider it a dermic 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
