. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Prof. H. G. Seeley on the Ornithosaurian Pelvis. 251 fellow in the median line if the ischiac margins came together, as in Crocodiles ; and the prepubis would then have the posi- tion of the bone in Crocodiles which most authors identify as Fig. 12. prepubis. ¥is. 13. ischium. Fig. 12.—Eestored Ventral Aspect of Pelvis of Cycnorhamphus Fraasii. Fig. 13.—Restored Ventral Aspect of Pelvis of Dimorphodon macronyx. the pubis, but which I have supposed to be the prepubic
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Prof. H. G. Seeley on the Ornithosaurian Pelvis. 251 fellow in the median line if the ischiac margins came together, as in Crocodiles ; and the prepubis would then have the posi- tion of the bone in Crocodiles which most authors identify as Fig. 12. prepubis. ¥is. 13. ischium. Fig. 12.—Eestored Ventral Aspect of Pelvis of Cycnorhamphus Fraasii. Fig. 13.—Restored Ventral Aspect of Pelvis of Dimorphodon macronyx. the pubis, but which I have supposed to be the prepubic bone. I have stated the reasons for that identification already * ; but if a pelvis like that of the Alligator (fig. 14) is compared with that of an Ornithosaur, say Cycnorhamphus, in which the shape of the ischium can be seen, it will be found that the two bones are very similar in form—as similar as are the prepubes. In many Ornithosaurs, such as Pt. dubius, the connexion between the ischium and pubis is a narrow process. If then the pubis dwindles away till the prepubis completely takes its place, except that it never enters the acetabular cup, we have the change which would convert the pelvis of an Ornithosaur into that of a Crocodile. Thus we may accept * Proc. Roy. Soc. vol. xliii. p. 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 London, Taylor and Francis, Ltd
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