The vertebræ are not so clearly marked as one is led to believe from Cope's figure. Measurements of the Type of Molgophis wheatleyi Cope. mm. Length of entire specimen 63 Length of portion of skull preserved 9 Posterior width of same 8.5 Length of a vertebra 1.5 Width of a vertebra 1.5 Length of a posterior rib 5 Width of rib 5 The species is dedicated to Charles M. Wheatley, of Phœnixville, Pennsylvania, one of the original investigators of the Linton deposits. It is a part of the Newberry Collection. Additional material of this species is represented by specimens Nos. 7 and 8699 G of the American Museum of Natural History. They are both very unsatisfactory. They consist of molds of the vertebral column, with in one case an enlargement at one end which may represent the head, and if such, the specimen probably represents a distinct species. The impression, No. 7, contains molds of about 30 vertebræ which are very similar in form to those exhibited by the type of the species. To the vertebræ are articulated short, curved ribs of a slender nature. The vertebræ themselves are short and somewhat constricted in the middle. The other impression, 8699 G, contains impressions of about 20 vertebræ, apparently immature, though one can not be entirely sure as to the nature of the structures. They are covered over with a thin layer of carbonaceous material which is impossible to remove satisfactorily. The two specimens remind one of what Huxley has written in regard to the forms of Microsauria (334) from Kilkenny, Ireland. Measurements of Nos. 7 and 8699 G (Molgophis wheatleyi). mm. Length of No. 7 87 Length of head mold 18 Posterior width of head 6 Length of vertebra 2 Length of rib 3 Length of specimen No. 8699 G 53 =Genus ERPETOBRACHIUM Moodie, 1912.= Moodie, Kans. Univ. Sci. Bull., VI, No. 2, p. 353, 1912. Type: _Erpetobrachium mazonensis_ Moodie. The generic characters are apparent in the greatly elongated fore limb, in the exceptionally broad scapula, the long radius and ulna, which slightly exceed the humerus in length, a character hitherto unknown among Carboniferous Amphibia. =Erpetobrachium mazonensis Moodie.= Moodie, Kans. Univ. Sci. Bull., VI, No. 2, pp. 353-354, pl. 2, fig. 2; pl. 8, fig. 3, 1912. Type: Specimen No. 799 (222), Yale University Museum. Horizon and locality: Mazon Creek shales, near Morris, Illinois.