. A manual of zoology. Zoology. 596 GIIOBDATA. Sab Order 11, TPJONYCIIIA. Fresh-water forms with poorly ossified carapace, but ribs and vertcbno coniitoted witli it. Our leather turtles (Ainyda*) and soft shelled turtles (Aspit/onectes*)of savage habits belong here. Sub Order III. CRYPTODIKA. Carapace well developed and united with ribs and vertebrse, but the pelvic arcli free. The species are numer- ous, including terrestrial, fresh-water, and marine forms. Cheltdrid^, fresh water, tail long. Chelyd7'a serpentina,* snapjjing turtle; Machrochelys. Fig. 6^.—CTicIonc imhricata, tortoise-snell tu
. A manual of zoology. Zoology. 596 GIIOBDATA. Sab Order 11, TPJONYCIIIA. Fresh-water forms with poorly ossified carapace, but ribs and vertcbno coniitoted witli it. Our leather turtles (Ainyda*) and soft shelled turtles (Aspit/onectes*)of savage habits belong here. Sub Order III. CRYPTODIKA. Carapace well developed and united with ribs and vertebrse, but the pelvic arcli free. The species are numer- ous, including terrestrial, fresh-water, and marine forms. Cheltdrid^, fresh water, tail long. Chelyd7'a serpentina,* snapjjing turtle; Machrochelys. Fig. 6^.—CTicIonc imhricata, tortoise-snell turtle. (From Hajek.) lacertina* alligator turtle. CheloniD/E, marine, paddle-like feet. Tha- laasoehelys caretta* loggerhead; Chelone mydas* green turtle, the favorite of epicures; Eretmochelys imhricata, whose horny shields furnish tortoise shell. TESTUDiNiDiE, terrestrial, including Xerohatts* the ' gopher turtle' of the South, the giant Testudoot the Galapagos Islands, and the enormous fossil Colossochelys atlas of India, 18-20 feet long, 8 feet high. Other families contain our mud turtles (Kinosternon *}, box tnvttes (Cistudo*), and terrapins (Malademmys*). Sub Order IV. PLEURODIRA. Pelvis united to carapace and plastron. All belong to the southern hemisphere. Order V. Rhyncliocephalia. These resemble the lizards not only in body form (four iive- toed feet) and in scaly skin, but in certain anatomical matters as well: lack of hard palate, presence of epipterygoid, transverse cloaca! opening, and heart, lungs, and brain. On the other hand they recall the crocodiles in having two postorbital arches and immovable quadrate. The large abdominal sternum and abdominal ribs are noticeable as well as the unciiiate processes of the true ribs. The notochord is bttt incompletely replaced. The group appears in the Permian and is thus one of the oldest of reptilian types, and is usually regarded as ancestral to all the orders yet to be mentioned. The only living species, Splienodon {Hat
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
