The species differs from the type of the genus (_T. punctulatus_) in the possession of a broadly rounded muzzle. This character will also separate it from other species of the genus. The sculpturing of the bones of the cranium is coarser in the present species than in the type. The form of the clavicle is different in the two species. The above-described species seems to be more closely allied to the form described as Tuditanus walcotti than to other species of the genus. I have been unable to detect the presence of limbs, although Cope says they are present. Measurements of the Type of Tuditanus brevirostris Cope. mm. Median length of skull 15 Width of skull at posterior border 18 Width of skull across orbits 11.5 Length of orbit 3 Width of orbit 2 Interorbital space 4.5 Length of clavicle 7 Width of clavicle 3 Length of longest rib preserved 9 Length of entire specimen 54 The material consists of the type specimen with counterpart and two fragments which probably are to be associated with this species. Collected by Doctor J. S. Newberry. =Tuditanus longipes Cope.= Cope, Trans. Amer. Phil. Soc., XV, p. 210, 1874 (Sauropleura). Cope, Geol. Surv. Ohio, II, pt. II, 398, pl. XXVI, fig. 2, 1875. Type: Specimen No. 1099 G, American Museum of Natural History. Horizon and locality: Linton, Ohio, Coal Measures. The cranium of this species is quite unknown. The only genus with which the specimen can be compared in the structure of the skeleton is _Tuditanus_. From the other species of the genus the present form differs in the presence of ventral chevron rods and the elongate character of the limbs, as well as in the possession of large iliac bones, which, in the only other species in which the ilia are known, are small and slender. It seems best to locate the species in this genus for the present, although it may eventually have to be removed to another group. Very little is known of the main portion of the skeleton of the species of _Tuditanus_, other than in _T. longipes_, so an exact comparison is impossible. From all the species of Tuditanus thus far known the present species differs in the elongate character of the limbs and in the presence of ventral scutellation. There are three other species of Tuditanus in which the limbs are known. These are: _T. walcotti_ Moodie, _T. minimus_ Moodie, and _T. punctulatus_ Cope. In these three species the limbs are short and weakly developed. From the other species of _Tuditanus_ the present species maybe separated by its size principally, since nothing of the bodies of the other species is known.