. Outlines of zoology. Zoology. 582 REPTILES. connected with the ; The quadrate articulates with the pro-otic, for there is no squamosal. Example.—Typhlops, very widely distributed. In all other Ophidians the palatines are widely separated, and their long axes are longitudinal; there are transverse bones connecting palatines and maxillfe; the pterygoids are connected with the quadrates. Sub-order z. Colubriformes (innocuous snakes). The poison gland is not developed as such ; the maxillary teeth are not grooved. Examples.—The British smooth snake (Coronella /avis); the British g
. Outlines of zoology. Zoology. 582 REPTILES. connected with the ; The quadrate articulates with the pro-otic, for there is no squamosal. Example.—Typhlops, very widely distributed. In all other Ophidians the palatines are widely separated, and their long axes are longitudinal; there are transverse bones connecting palatines and maxillfe; the pterygoids are connected with the quadrates. Sub-order z. Colubriformes (innocuous snakes). The poison gland is not developed as such ; the maxillary teeth are not grooved. Examples.—The British smooth snake (Coronella /avis); the British grass snake (Tropido- nolus natrix); the Pythons ; the Boas, of which the An- aconda (Boa murina) (30 feet) is the largest living Ophidian. Sub-order 3. Colubriformes Venenosi. Examples. —Cobras, Naja tripu- dians (Indian), Naja haje (African) ; the Hamadryad (Ophiophagus daps), eating other snakes ; Coral - snakes (Elaps, etc.) ; Sea-snakes (Hydrophis, etc.), with paddle- shaped tails. Sub-order 4. Viperiformes. Examples.—The British adder (Pelias berus); the rattlesnake (Crotalus), with a rattle formed chiefly from epidermic remnants of successive slough- ings; the African Puff-adder (Clotlio arietans).. Fig. 253.—Lower surface of skull of a young crocodile. , Premaxilla; mx., maxilla pal., palatine; , os trans versuin ; pt., pterygoid ; /., jugal Qj., quadrato-jugal; Q., quad rate; posterior nares ; c. condyle. Crocodilia. Crocodiles, Alligators, Gavials. General Characters.—The Crocodilians are carnivorous fresh- water reptiles of large size, now represented by a few genera, Crocodilus, Alligator, and Gavialis. The skin bears epidermic scales, underneath some of which there are dermic bones or scutes. The tail is laterally compressed, and assists in swimming. Teeth occur in distinct sockets in the premaxilla, maxilla, and dentaries. Inmodern Crocodilians, almost allthe vertebra are Please note that these images are extracted from
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
