. Outlines of zoology. Fig. 329.—External appearance of tortoise. prix. Fig. 330.—Skull of turtle. ^ supra-occipital;/^^., parietal; i?V?., frontal; , pre-frontal; post-frontal; SQ.^ squamosal; PMX., pie-maxilla; MX., maxilla; /., jugal; , quadrato^ugal; Q.,quadrate; D,j dentary; AN,, angular; AR., articular; S.,surangular. shelter of which the head and neck, tail and limbs, can bemore or less retracted. The dorsal carapace is usually formed 6i4 REPTILIA. from—(a) the flattened neural spines {plus dermal scutes);(b) expanded and more or less coalesced ribs {plus costaldermal
. Outlines of zoology. Fig. 329.—External appearance of tortoise. prix. Fig. 330.—Skull of turtle. ^ supra-occipital;/^^., parietal; i?V?., frontal; , pre-frontal; post-frontal; SQ.^ squamosal; PMX., pie-maxilla; MX., maxilla; /., jugal; , quadrato^ugal; Q.,quadrate; D,j dentary; AN,, angular; AR., articular; S.,surangular. shelter of which the head and neck, tail and limbs, can bemore or less retracted. The dorsal carapace is usually formed 6i4 REPTILIA. from—(a) the flattened neural spines {plus dermal scutes);(b) expanded and more or less coalesced ribs {plus costaldermal scutes) ; (c) a series of dermal marginal scutes aroundthe outer edge. In the Athecce the dorsal vertebm and ribsare not fused to the dermal plates which form the ventral shield or plastron is formed of nine or so dermalbones. There is no sternum. Overlapping, but not corresponding to the bony plates, thereare {except in Trionychia and Athecce) epidermic horny platesof tortoise shell, which, though very hard, are not withoutsensitiveness, numerous n
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
