Cope, Geol. Surv. Ohio, II, pt. II, p. 399, 1875.
Cope, Proc. Am. Phil. Soc., XX, p. 461, 1882.
Type: Leptophractus obsoletus Cope.
The genus was established on various parts of the cranium of a large amphibian. The only parts which can with certainty be referred to the genus are the upper and lower jaws of 3 specimens. These bear large teeth, round in section at the base, but with acute compressed apex, with a cutting-edge on the anterior face; the enamel is delicately grooved, as an external indication of the labyrinthic structure. A characteristic feature is seen in the presence of a large elongate tooth in the upper jaw, in the position of a canine which much exceeds in length any of the others. The sculpture of the cranium is but little marked in the known specimens. In the type the lower jaw is marked with inosculating grooves. Three species are known, which are among the largest of the Linton Amphibia.
Leptophractus obsoletus Cope.
Cope, Proc. Phila. Acad. Nat. Sci., p. 340, 1873.
Cope, Geol. Surv. Ohio, II, pt. II, p. 399, 1875.
Cope, Proc. Am. Phil. Soc., XX, p. 461, 1882.
Type: Specimen Nos. 55 G and 57 G, American Museum of Natural History.
Horizon and locality: Linton, Ohio, Coal Measures.