. A manual of zoology. Zoology. 5L'li CIIORDATA ho\ve\er, ignores the fossil forms, \\lien these are taken into considera- tion another grouping must be a(.lopted. Order I. Theromorpha. Extinct reptiles from the Permian and triassic, closely related to the stego- cephala; with amphica'lous \erlebra\ inimovahle ([uadrate, and from two to six sacral \'ertel)ra-. Anomodon'Tia, wilh partial or complete loss of teeth, near the turdes; the Thkriodonta, in which a Iielcrodont dentition is devel- oped, rcsendilc mammals, which, by many, are supposed to ha\'e descended from them. Order II. Plesiosauria
. A manual of zoology. Zoology. 5L'li CIIORDATA ho\ve\er, ignores the fossil forms, \\lien these are taken into considera- tion another grouping must be a(.lopted. Order I. Theromorpha. Extinct reptiles from the Permian and triassic, closely related to the stego- cephala; with amphica'lous \erlebra\ inimovahle ([uadrate, and from two to six sacral \'ertel)ra-. Anomodon'Tia, wilh partial or complete loss of teeth, near the turdes; the Thkriodonta, in which a Iielcrodont dentition is devel- oped, rcsendilc mammals, which, by many, are supposed to ha\'e descended from them. Order II. Plesiosauria. Extinct aquatic forms from the mcsozoic, some of them forty feet long. Thev had long necks; limbs wire swimming paddles recalling the fli])pers of whales; quadrate immo\able; jaws long, with numerous teeth in sockets. Order III. Ichthyosauria. Resembled the Plcsiosaurs in swimming feet, elongate jaws, and quadrate, but had teeth (sometimes absent) in grooves, and short necks. At least some species were \iviparous. ^Mcsozoic. Order IV. Chelonia (Testudinata). The turtles form in external appearance a sharply circumscribed group, with the short and compact body enclosed in a bony case, from wdiich only head, tail, and legs protrude (figs. 575, 576). The case consists of a convex dorsal portion, the carapace and a flattened ventral plastron, the two being united in most forms at the margins. Each consists of bony plates, the posi- tions and names of which may be learned from the adjacent cut. It only needs mention that the neural plates are united with the spinous processes, the costals. ^y // Ty. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
