. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson: The Osteology of Promerycochoerus. 189 anterior portion, but otherwise the pelvis has the usual antero-pos- terior elongation and the deep, narrow pelvic cavity, characteristic of the family. The point of the ilium is rather heavy and rugose, affording extensive surfaces for muscu- lar attachments. From this rugosity backwards to the iliosacral contact is a very prominent ridge on the internal face of the ilium, which also serves for the attachment of muscles. The spines of the sacr
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. Peterson: The Osteology of Promerycochoerus. 189 anterior portion, but otherwise the pelvis has the usual antero-pos- terior elongation and the deep, narrow pelvic cavity, characteristic of the family. The point of the ilium is rather heavy and rugose, affording extensive surfaces for muscu- lar attachments. From this rugosity backwards to the iliosacral contact is a very prominent ridge on the internal face of the ilium, which also serves for the attachment of muscles. The spines of the sacrum when in position, rise above the superior iliac border. The latter is rounded from before backward and the ilium is rapidly con- tracted to a notch back of the sacro- iliac contact much as in Merycoidodon culhertsoni, Mesoreodon, and other genera of the family. The acetabular border of the ilium forms a long and gently concave sweep from the point of the ilium to the anterior border of the acetabulum. The latter is rather small, though deep, and the pit for the ligamentum teres is unusually deep. The cotyloid notch is deep, but narrow, and relatively smaller than in Merycoidodon, and much smaller than in Mesoreodon chelonyx. The ischium is elongated and robust, with a broad rough surface over the acetabulum which terminates above in a deep ridge or spine. This spine again decreases in prominence to form the lesser sacro-sciatic notch after which the ischium again sud- denly rises in an upward and outward direction to form the high and robust ischial tuberosity. The broad surface of the posterior portion of the ischium is sub-triangular in out- line, very high, terminating above in the large tuberosity mentioned and below in a heavy and rugose area, which is developed into a large tubercle on the posterior ventral angle of the symphysis. The ascend-. FiG. 29. Lateral view of sacrum and pelvis of Promerycochcerus carri- keri. No. 1081. ^ nat. Please note that these imag
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