M. Total length (estimated in part) ·404 Length of head ·093 Length of vertebral column ·253 Length of caudal fin (estimated) ·058 Length of mandible ·059 Length of jugular plate ·032 Length of dorsal region ·141 Length of caudal region ·112 Depth of body at origin of dorsal fin Length of dorsal fin ·117 Length of femur ·027 From the insect beds near Florissant, Col. PAPPICHTHYS, Cope. U. S. Geol. Survey of the Terrs., 1872, p. 634. Vertebræ short, dorsal with projecting diapophyses. Maxillary and dentary bones support but one series of teeth. Pappichthys plicatus, Cope. Loc. cit., p. 635. From Henry's Fork. Pappichthys lævis, Cope. Loc. cit., p. 366. Represented by three vertebræ from the posterior part of the dorsal region. The centra are subcircular and have deep articular cones, with their bottoms above the centre, and minutely perforate for the notochord. The centra are comparatively quite long, and have prominent projecting rims, and are truncate beneath. The facets for the neurapophyses are long, and are separated into two parts for the contiguous arches. The diapophyses are short and stout. Measurements. M. Length of centrum ·015 Breadth of centrum ·0315 Depth of centrum ·027 Found at Henry's Fork. Pappichthys symphysis, Cope. Loc. cit., p. 636. Found at Cottonwood Creek. ELASMOBRANCHII. PLAGIOSTOMATA. _CARCHARIDÆ._ "Eye with a nictitating membrane. An anal fin; two dorsals." GALEOCERDO. Caudal fin with a double notch; mouth crescent shaped; teeth subequal in both jaws, oblique, serrate on both margins. Galeocerdo falcatus, Ag. _Corax falcatus_, Poiss. Foss., t. iii., p. 226.