. Bulletin. Natural history. 98 PEABODY MUSEUM BULLETIN 23. Text-fig. 56. Lateral view of pelvic girdle of Mosasaurus conodon (USNM 11396, x about i/4) with the elements in natural articulation. Abbreviations: il, ilium; is, ischium; ist, ischiadic tubercle; obt, obturator foramen; pu, pubis; put, pubic tubercle. are apparent. The beveled edges of their symphyseal shafts indicate that the ischia and pubes of opposite sides met on the ventral midline of the body with a relatively minor amount of intervening cartilage and were oriented in a trans- verse plane at an angle of about 30° to the hori

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. Bulletin. Natural history. 98 PEABODY MUSEUM BULLETIN 23. Text-fig. 56. Lateral view of pelvic girdle of Mosasaurus conodon (USNM 11396, x about i/4) with the elements in natural articulation. Abbreviations: il, ilium; is, ischium; ist, ischiadic tubercle; obt, obturator foramen; pu, pubis; put, pubic tubercle. are apparent. The beveled edges of their symphyseal shafts indicate that the ischia and pubes of opposite sides met on the ventral midline of the body with a relatively minor amount of intervening cartilage and were oriented in a trans- verse plane at an angle of about 30° to the horizontal. The pubic shaft is twisted so that its leading edge is rotated ventrally. Because it is longer than the ischiadic shaft, the acetabulum assumes a posterolateral inclination. The symphyseal shaft of the ischium was depressed anteriorly in life, and has a posterodorsally turned ischiadic process. In this specimen the three pelvic ele- ments were closely united by connective tissue to form an imperforate acetab- ulum. Facets on the pubis and ischium indicate that the shaft of the ilium was vertical in a transverse plane and anteriorly inclined at an angle of about 60° to the horizontal in lateral aspect. ILIUM The ilium is a slender, club-shaped bone in mosasaurs. Its ventral end is expanded and, in CUdastes and Mosasaurus conodon, divided into a ventral facet for the ischium, an anteroventral one for the pubis, and a broad, concave, lateral facet for the acetabulum. These facets are very much less distinct in Amphekepubis (Mehl, 1930, pi. 65 figs. 2-3), Platecarpiis and Tylosaurus. In M. conodon, Amphekepubis (Mehl, 1930) and Platecarpiis there is a distinct scar on the posterior surface of the ventral end, possibly for the attachment of a portion of the M. iliocaudalis.. 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