. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 152 PELVIS. wings, the anterior part seems deficient, the anterior superior spine'(a) being placed directly over the cotyloid cavity ; and the crest (c) being, consequently, very short, terminating abruptly at the vertical rib mentioned in the description of the human ilium. The ales are more expanded in the Uran than the Chimpanzee. The crest does not present the lateral /-like curvature, and is less arched than in man. The anterior iliac spines are more widely separated, the inferior (6) being scarcely discernible, and
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 152 PELVIS. wings, the anterior part seems deficient, the anterior superior spine'(a) being placed directly over the cotyloid cavity ; and the crest (c) being, consequently, very short, terminating abruptly at the vertical rib mentioned in the description of the human ilium. The ales are more expanded in the Uran than the Chimpanzee. The crest does not present the lateral /-like curvature, and is less arched than in man. The anterior iliac spines are more widely separated, the inferior (6) being scarcely discernible, and the border between them thin and concave. The posterior, or iliac tuberosity is even less prominent in these animals than in the lower order of Ruminants. The distance from the cotyloid to the sacro- iliac joint is 3^ inches in the Hunterian Chim- panzee, and about 3 inches in the Uran, though, from the greater straightness and obliquity of the cotylo-sacral arch (r/) and the want of the anterior curve, the direct horizontal distance between these points is about the same as in man. In the Simice generally, the ilia are said to be placed almost in a straight line with the spinal column. Added to the great length of the ilia, this arrangement causes the pelvic brim to be much elongated from before back- wards ; but much less so, however, than it would be if the pubes and iliac shafts were in the same plane. I have, however, found the ilio-verlebral angle in Chimpanzee, Uran, long- armed Gibbon, and brown Baboon to be very little, if at all greater than the human pelvi- vertebral, as far as could be ascertained without actual section of the bones. But in the Lemurs the ilia are only 10° from being in the same straight line with the spine ; while in the Man- drill and many Monkeys they are almost pa- rallel. This characteristic, heightened by that of the much diminished curve of the lumbar vertebra and the elongation of the iliac shafts in these animals, contributes to form a g
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