The pelvis of lemurs is narrow, attached lightly to the slender sacrum, tilted at an angle of 140° and is possessed of a short weak symphysis; it resembles the structure in bats. In macaques the box is long, the sacrum wide, with a short iliac synostosis, the ilia long, narrow and curved out sharply, the ischia are continuous with the ilia and widely separated; the symphysis is short, about one-sixth the pelvic length; the angle of the superior strait is about 60°; the outlet is oval, the transverse diameter being short. The chimpanzee pelvis is made up of a wedge-shaped sacrum composed of three vertebræ, wide, flaring, concave ilia, stout well separated ischia with flattened tuberosities and a short symphysis parallel to the sacrum; the outlet is ovoid; true conjugate angle is 65°; the sacroiliac junction has little motility. In the gorillas the following points differ from the last described structure. Five vertebræ comprise the sacrum and the anterior surface is distinctly concave; the pelvic contour while still ovoid, has the two diameters more nearly equal; the pelvic angle is obtuse; the true conjugate is at an angle of 70°. In man the salient features of the pelvis are—a broad, wedge-shaped sacrum, concave anteriorly, with wide articular surfaces and a limited motility; widely flaring ilia including the concave curvature of the body of the bone whereby the lateral diameter of the pelvic inlet becomes wider than in lower orders; short stout pubes with a narrowed angle beneath them; heavy blunt ischia with large tuberosities; true conjugate is at an angle of 55°. The human fetal pelvis resembles that of quadrupeds.