5. Type of Cope's species _Tuditanus mordax_ referred by him to the cranium, on account of the sculpturing of the elements. We now know the specimen to be portions of the interclavicle and clavicles of _Diceratosaurus punctolineatus_, as Cope suggested they might be. Original in American Museum of Natural History. × 1. 6. Skull of _Baphetes planiceps_ Owen from the Coal Measures of Nova Scotia. × 0.45. Original in the British Museum. South Kensington. After Owen. ] This species may be distinguished from other members of the genus by the large size and shape of the cranium (462) and the broad mandible (plate 16, figs. 2, 3) with its very long teeth. The skull of _Sauropleura digitata_ Cope is not known, but the body of that animal as preserved represents far too small a form for the skull to be referred to that species. The skull is fully half as long as the dorsal region of _S. digitata_ Cope, so that an association of the remains would be incongruous. It differs from the skull of _S. scutellata_ Newberry in size and proportions. The skull of _S. scutellata_ is narrow, while in _S. longidentata_ it is quite broad. The teeth of the latter are also characteristic of the species, since in all other known species of this genus in which the skull is preserved the large anterior tooth is wanting. The bones of the skull show the coarse sculpturing of the larger species of Microsauria. It consists more of radiating grooves than of pits. The skull, as restored (462), is broadly ovate, with the posterior border truncate. The muzzle is broad and the nostrils are, apparently, located near the anterior margin. The posterior border of the orbits lies near the median transverse line of the skull. They are circular and are removed some distance from the margin of the cranium. Only the frontal and parietal can be determined with certainty. The mandible is heavy and is provided with pleurodont, heterodont teeth. Near the anterior end of the mandible there is a very long fang-like tooth, longitudinally striated and slightly recurved, which arises from a broad base and attains to considerable prominence. The other teeth are smaller, though the next succeeding one is still of considerable size. All of the teeth preserved are longitudinally striated, but only the two anterior ones are recurved to any extent. Measurements of the Type.