The present specimen is preserved on a block of slate from Cannelton, Pennsylvania. It is associated with the previously described _Erpetosaurus sculptilis_ Moodie on account of its size, the geological and geographical distribution, and the character of the sculpture. It may pertain to an unknown species. Other remains besides the 3 elements of the pectoral girdle are preserved on the block of slate, but they are, for the most part, too imperfectly preserved for recognition. Some of them are phalanges, and I believe I detect a scapula in the rounded curved plate lying near the right clavicle. The 3 pectoral elements, the interclavicle and the 2 clavicles, are preserved intact, with the ventral surface uppermost. The specimen is particularly important in that it furnishes further evidence of the simplicity of the microsaurian pectoral girdle, which Jaekel regarded (347) as being extremely complex, in one species at least, _Diceratosaurus punctolineatus_ Cope. The 3 elements are broken, but either the elements or their impressions are present, so that identification is possible. The elements are sculptured with radiating grooves and ridges, as in so many of the Microsauria. The interclavicle is spatulate and bears a general resemblance to the same element of _Metoposaurus fraasi_ Lucas from the Triassic (383) of Arizona. The clavicles are triangular, with rounded angles and the hypothenuse on the interior border. [Illustration: MOODIE PLATE 14 1 and 2. Photograph of the specimen of _Amphibamus grandiceps_ Cope, from the Mazon Creek shales. × 1.5. Original in possession of Mr. L. E. Daniels, Rolling Prairie, Indiana. 3. Specimen of _Sauropleura (Colosteus) scutellata_ Newberry, from the Linton Coal Measures. The species was the first known of the Ohio Coal Measures Amphibia; at first ascribed by Newberry to the fishes, but later correctly identified by Cope. × 1. Original in American Museum of Natural History. 4. The type of _Diceratosaurus (Ceraterpeton) punctolineatus_ Cope, from the Linton Coal Measures. × 1. Original in American Museum of Natural History. ] Measurements of Pectoral Girdle of Specimen No. 4539, U. S. National Museum. mm. Width across the entire girdle 17 Length of interclavicle 15 Width of interclavicle 10 Length of clavicle 11 Width of clavicle, maximum 6 =Erpetosaurus acutirostris Moodie.= Moodie, Bull. Amer. Mus. Nat. Hist., XXVI, pp. 349-351, pl. lxi, fig. 1, 1909. Type: Specimen No. 8598 G, American Museum of Natural History. Horizon and locality: Linton, Ohio, Coal Measures.