"The only specimen of the species exhibits an inferior view of a portion of the skeleton; and the obverse, on which the thoracic and abdominal armor could have been preserved, has not come under my observation. The specimen, however, does not exhibit any ribs, although the vertebræ are well preserved. As observed by Professor Wyman, the genus presents some points of similarity to the Anura (Salientia). The prolongation of the angles of the mandible is of this character, as well as the general form of the head. The bones of the forearm may be united as in the frogs, and the length and curvature of the femur are seen among these animals rather than the Salamanders. The form of the femur is different from that of _Amphibamus grandiceps_ Cope, which also differs in the presence of dermal scales and ventral scutellæ." (123.) [Illustration: MOODIE PLATE 7 _Hylerpeton dawsoni_ Owen. Above: Mandible, teeth, rib, and bones of extremity. Below: Bones of pelvis and posterior limb and bony scales. Nearly natural size. Erect tree, Coal formation, South Joggins, Nova Scotia. Photograph by Dawson, published through the courtesy of Dr. Arthur Willey. Original specimens in Peter Redpath Museum of McGill University.] =Pelion lyelli Wyman.= Wyman, Am. Jour. Sci. (2), XXV, p. 160, 1858. Cope, Proc. Acad. Nat. Sci. Phil., 1868, p. 211. Cope, Geol. Surv. Ohio, II, pt. II, p. 390, pl. XXVI, fig. 1, 1875. Moodie, Pop. Sci. Monthly, LXXII, p. 562, fig. 1, 1908. Type: Specimen No. 7909 G, American Museum of Natural History. Horizon and locality: Linton, Ohio, Coal Measures. (Plate 24, fig. 1.) This was the first species described from the Linton, Ohio, deposits. It was made known by Dr. Wyman in 1857 at the meeting of the American Association for the Advancement of Science for that year. The species was subsequently studied by Cope. He merely confirmed Wyman's observations. The following description is based on the descriptions of Cope and Wyman and on my own study of the type specimen.