. Breviora. 12 BREVIORA No. 161 muscle in Pyxis appears to be a case of an intermediate stage between the typical condition of the Testudininae, on one hand, where the muscle is absent, and that of Bmydinae, on the other, in which it is better developed. In Stcrnotheriis odoratus and Sternotherus carinatus yyiinor, belonging to Kinosterninae, the muscularis striatum pulmonale is similar in its origin, course and insertion to that described for the Malaclemys terrapin terrapin (Fig. 3). In Chelydra ser- pentina of the Chelydrinae the muscle is completely absent and instead a thin layer of conne
. Breviora. 12 BREVIORA No. 161 muscle in Pyxis appears to be a case of an intermediate stage between the typical condition of the Testudininae, on one hand, where the muscle is absent, and that of Bmydinae, on the other, in which it is better developed. In Stcrnotheriis odoratus and Sternotherus carinatus yyiinor, belonging to Kinosterninae, the muscularis striatum pulmonale is similar in its origin, course and insertion to that described for the Malaclemys terrapin terrapin (Fig. 3). In Chelydra ser- pentina of the Chelydrinae the muscle is completely absent and instead a thin layer of connective tissue is present in its place. In Chelonia mydas, Caretta caretta, Lepidochelys olivacea and Eretmochelys imhricata (Fig. 7), which all belong to the family Chelonidae, the muscularis striatum pulmonale is totally absent. Even in Dermochelys coriacea (Fig. 7), of the Dermochelyoidea, —^ T, A. Fig. 12. Diagrammatic sketch of the disposition of the respiratory muscles in sucli Emydinae as Geoemyda spinosa, etc. the muscle is absent. Thus, it appears that none of the marine forms possess any lung muscle, and that unlike the land forms or the fresh water ones there is no variation in this regard. All the members belonging to the suborder Pleurodira possess a partial muscularis striatum pulmonale rather similar to that seen in the Emydinae (Fig. 5). The members of the genus. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University
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