The post-cranial skeleton, unlike the skull of the Amphisbaenidae (Zangerl, 1944), does not exhibit as many characters peculiar to this group of reptiles. In some respects there are similarities with the post-cranial skeleton of the snakes, (e.g., the large number of presacral vertebrae; distally forked ribs in the sacral region; no haemapophyses, but paired ventral processes in the tail region, analogous to haemapophyses), in other respects with that of the lizards (e.g., the structure of the vertebrae lacking zygosphen-zyganthrum connection; the presence of a shoulder girdle and front limbs in the genus Bipes, with a lacertiloid carpus, but a strange phalangeal formula of 3, 3, 3, 3, 3; vestigesl of a shoulder girdle in Blanus cinereus, and other forms). Furthermore there are similarities which the amphisbaenids have in common with the snakes and the limbless forms among the lizards (e.g., lymphapophyses in the sacral region). Practically all of these characters are clearly adaptive and do not suggest a close relationship to either the lizards or the snakes. Scattered information concerning the post-cranial skeleton of the Amphisbaenidae can be found in the literature. Most descriptions and illustrations concern girdle and limb vestiges (Joh. Miuller, 1832; Dumeril and Bibron, 1839, 1854; Gervais, 1853; Fiirbringer, 1870, 1900; Smalian, 1885; Cope, 1892a; K. H. M. Muller, 1900) and need to be revised and expanded.