. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 372. Outer surface, plastron, young Tortoise. Inner surface, plastron, young Tortoise. into one more or less flat floor, and all the parts of the carapace into one more or less convex roof, fig. 51; side-walls being like- wise now formed by the union of the hyo- and hypo-sternals with the coextensive marginal plates. In all Chelonia, save the TrionycidcB and Sphargis, the epiderm of the-trunk is condensed into large horny scales, usually contiguous, more rarely imbricate, and then only on the carajiace. They may be keele
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 372. Outer surface, plastron, young Tortoise. Inner surface, plastron, young Tortoise. into one more or less flat floor, and all the parts of the carapace into one more or less convex roof, fig. 51; side-walls being like- wise now formed by the union of the hyo- and hypo-sternals with the coextensive marginal plates. In all Chelonia, save the TrionycidcB and Sphargis, the epiderm of the-trunk is condensed into large horny scales, usually contiguous, more rarely imbricate, and then only on the carajiace. They may be keeled, or rugous, or scabrous, but are commonly smooth and polished, or marked only by concentric lines of growth. Their growing margins indent the dermal bones supporting them, forming the triradiate grooves, e. g. u^ion the beginnings of the costal â plates in the young Tortoise, fig. 370, jih, and those marked si-s5 on the neural and costal plates in the Turtle, fig. 52. The large epi- dermal plates of the carapace and plastron are termed ' shields' and ' tortoise-shell:' most of them have special names in Zoology, as they afford useful characters in the discrimination of genera and species; whilst the impressions they leave upon the subjacent bones give similar light in the interpretation of fossil 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 Owen, Richard, 1804-1892; Cornell University. College of Veterinary Medicine. Flower-Sprecher Veterinary Library. fmo. London, Longmans, Green
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