. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 34.—Plastron of Trionyx. en, ento- plastron; ep, epiplastron; hpp, hypoplastron; hyp, hyoplastron; xp, xiphiplastron. FIG. 35.—Ventral ends of ribs (r) and gastralia (g) of Sphenodon. only in the armadillos where they form a complete armor above, the plates arranged- in transverse rows, some of which are movable on each other. In the extinct glyptodons they formed an inflexible case. It is uncertain whether these are a new acquisition in the edentates or have been inherited from non-mammalian ancestors. TH
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FIG. 34.—Plastron of Trionyx. en, ento- plastron; ep, epiplastron; hpp, hypoplastron; hyp, hyoplastron; xp, xiphiplastron. FIG. 35.—Ventral ends of ribs (r) and gastralia (g) of Sphenodon. only in the armadillos where they form a complete armor above, the plates arranged- in transverse rows, some of which are movable on each other. In the extinct glyptodons they formed an inflexible case. It is uncertain whether these are a new acquisition in the edentates or have been inherited from non-mammalian ancestors. THE ENDOSKELETON. The endoskeleton may pass through three stages in its develop- ment, including the membranous stage. From this it may pass through a cartilage stage before becoming bone, or it may in part develop directly into bone from membrane, or, lastly, it may never pass beyond the cartilage stage. Thus only the membranous stage is constant. These differences in development are of great importance in tracing homologies between bones in different groups, but the distinction be- tween bones developing directly from membrane (membrane bones). 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 Kingsley, J. S. (John Sterling), 1854-1929. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
