. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 218 Bulletin Museum of Comparative Zoology, Vol. 150, No. 4. Figure 18. Stereophotographs of pelvis of ?Eucosmodon sp. (AMNH 16325), San Juan Basin. A) fragmentary right ilium and ischium, lateral view; B) fragmentary left ilium and ischium, lateral view. > Abbreviations: pob, dorsal margin of postobturator foramen. imately mm wide and about 2 mm high; ahhough breakage has occurred, it appears to have been bordered ventrally by a very thin lamina of bone. The post- obturator foramen does not open into the
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 218 Bulletin Museum of Comparative Zoology, Vol. 150, No. 4. Figure 18. Stereophotographs of pelvis of ?Eucosmodon sp. (AMNH 16325), San Juan Basin. A) fragmentary right ilium and ischium, lateral view; B) fragmentary left ilium and ischium, lateral view. > Abbreviations: pob, dorsal margin of postobturator foramen. imately mm wide and about 2 mm high; ahhough breakage has occurred, it appears to have been bordered ventrally by a very thin lamina of bone. The post- obturator foramen does not open into the pelvic cavity, but rather represents a hia- tus in a keel-like ischio-pubic symphysis. The pubis forms the anterior and part of the ventral border of the obturator fo- ramen. Details of its shape, including the possible presence of facets for epipubic bones, have been lost by postmortem crushing and breakage. Two elongate, boomerang-shaped bones are located near the right ilium and left ischium, respectively. One end tapers, the other terminates in a slight swelling. A longitudinal sulcus traverses the length of one side of the shaft. These features are similar to those characteristic of the bones that Jenkins and Parrington (1976) iden- tified tentatively as the clavicles of Eozos- trodon. The possibility that these are clav- icles appears to be remote because no other elements of the anterior limb skeleton of Ptilodus were so displaced. Rather, it is likely that these are epipubes, and that Jenkins and Parrington's identification may be in error. Other Material—?Eticosmodon sp. (AMNH 16325), nearly complete pelvis including parts of both ilia and ischia, the pubes represented only by bone in region of iliopubic junction; ?Mesodma sp. (UMVP 1419), partial left ischium; ?Mesodma sp. (UMVP 1420), nearly complete left ilium lacking anterior tip of blade but including entire acetabulum; ?Mesodma sp. (UMVP 1417), partial left ischium; ?Mesodma sp. (UMVP 1418), nearly complete le
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