The forearm of the right side is preserved in part. The humerus is seen to be a heavy, somewhat expanded element lying displaced with relation to the pectoral girdle. It is greatly expanded at the ends. The ulna presents characters similar to the humerus and only differs from it in being shorter and less stout. The radius is not preserved. The carpus is unossified and its position is occupied by a blank space. The digits are represented by 4 metacarpals, and this may have constituted the entire number of the fingers. The phalangeal bones preserved are a little scattered. They are elongate with expanded ends. Evidences of 23 consecutive osseous vertebræ are preserved. Their character can not be determined, although Cope (123) describes them as amphicœlous. This may be inferred to be the case, but I am unable to verify his observation. In form the vertebra are subquadrate. The neural spines are not evident. The osseous ribs articulate, apparently, between the bodies of the vertebra. Cope figured them as intercentral. There are 22 or 23 pairs preserved. They are single-headed and the extremities are attenuated. No traces of ventral scutellæ are present. The entire length of the animal probably did not exceed 5 or 6 inches. Its form was quite lizard-like and it was probably of an ambulatory type, though it may have spent a part of its time in the old lagoon in which its remains were finally buried. No traces of external gills have been detected in this or any other Linton species. Measurements of the Type of Tuditanus punctulatus Cope. mm. Length of entire specimen 94 Median length of skull 22 Width of skull at occiput 19 Depth of mandibular ramus 4 Length of the 23 vertebræ 61 Length of interclavicle 6.5 Width of interclavicle 4.5 Width of the three pectoral plates 10 Length of humerus 8 Width of humerus at proximal end 2.5 Length of ulna 6 Width of ulna at proximal end 2 Length of phalanx (metacarpal?) 2 Expanse of longest ribs 16 Length of rib 10.5 Width of rib .5 Length of a vertebra 2.5 =Tuditanus brevirostris Cope.= Cope, Trans. Amer. Phil. Soc., XV, p. 272, 1874. Cope, Geol. Surv. Ohio, II, pt. II, p. 393, pl. xxvi, figs. 3, 4, 1875. Moodie, Bull. Amer. Museum Natl. Hist., XXVI, art. XXV, pl. lxiv, fig. 4, 1909. Type: Specimen No. 8609 G, American Museum of Natural History. Horizon and locality: Linton, Ohio, Coal Measures.