. Animal biology. Zoology; Biology. 388 METAZOAN PHYLA it now seems probable that it is not an ancestral form from which other lizards have sprung but rather a highly modified type which has persisted from earlier times. 419. Crocodilia.—This order contains some of the largest living reptiles, the gavials of southern Asia and the caymans of South and Central America reaching a length of 20 feet or more and a Philippine crocodile having been captured measuring 29 feet in length. A crocodile (//na. Femur Ilium Ischium Fig. 266.—Skeleton of a European turtle, Cistitdo lutaria (Marsili) preparatio
. Animal biology. Zoology; Biology. 388 METAZOAN PHYLA it now seems probable that it is not an ancestral form from which other lizards have sprung but rather a highly modified type which has persisted from earlier times. 419. Crocodilia.—This order contains some of the largest living reptiles, the gavials of southern Asia and the caymans of South and Central America reaching a length of 20 feet or more and a Philippine crocodile having been captured measuring 29 feet in length. A crocodile (//na. Femur Ilium Ischium Fig. 266.—Skeleton of a European turtle, Cistitdo lutaria (Marsili) preparation. A, the carapace with the internal skeleton The limb skeletons are inside the ribs. X %. From a mounted B, the plastron, removed. and an alligator (Fig. 265) are found in southern United States. Cro- codilia are lizard-like in form but the scales do not overlap, being set into the thick, leathery skin, broadened, and sometimes raised to form ridges. The snout is long and the nostrils are at its tip. Since the eyes project from the top of the head, the animal can lie just under the surface of the water with only its eyes and its nostrils exposed. The eyes are covered with lids and both nostrils and ears possess valves which may be closed when the animal is under water. There are several noteworthy details connected with the internal anatomy. The teeth are conical, set in sockets, and are capable of. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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