. Cope papers, 1871-[1897. Zoology; Paleontology. Cope.] 382 [April 15, North America and Europe ; PaehynolopTius, Hyrachyus, Hyracothe- rium, Plioloph Europe only ; Lophiudon, Lo- phiotTierium. Four of tlie genera ascribed to Nortli America have come un- der my observation. TRIPLOPID^.. Fig. I. Part of right maxillary bone of Pachynolophus singularis Cope; from the Wasatch beds of New Mexico, from Capt. "Wheeler's report iv 11 pi. Ixvl. Cope, American Naturalist, 1881, April (March 25th), p. 340. But one genus of this family is known at present, but the number will probably be in- crease
. Cope papers, 1871-[1897. Zoology; Paleontology. Cope.] 382 [April 15, North America and Europe ; PaehynolopTius, Hyrachyus, Hyracothe- rium, Plioloph Europe only ; Lophiudon, Lo- phiotTierium. Four of tlie genera ascribed to Nortli America have come un- der my observation. TRIPLOPID^.. Fig. I. Part of right maxillary bone of Pachynolophus singularis Cope; from the Wasatch beds of New Mexico, from Capt. "Wheeler's report iv 11 pi. Ixvl. Cope, American Naturalist, 1881, April (March 25th), p. 340. But one genus of this family is known at present, but the number will probably be in- creased when the structure of the feet of various imperfectly known species is ascertained. TRIPLOPUS Cope. American Naturalist, 1880, p. 383 (April 27th). ? ; anterior to the first premolar. Molars with only two vertical external ridgeis, the anterior cingular and the approximated median of the anterior crescent. Transverse crests two, uninterrupted and rather oblique ; a ? third and short crest, on the posterior base of the first true molar. Pre- molars different from molars, the third and fourth with two transverse crests. Inferior molars with two transverse crests, as in Lophiodon, the last without heel. An ossified inferior wall of the meatus auditorius externus. Posttym- panic and paroccipital processes distinct form each other. No postorbital arch. Postparietal and mastoid foramina preserved; the latter large. Cervical vertebrae rather long ; axis with subcylindric odontoid process. Scapula with small coronoid process. Great tuberosity of humerus long, curved. No trochlear crest on condyles of humerus ; epicondyles rudi- mental. Ulna and radius distinct throughout their length ; ulnar articula- tion with carpus, small. Trapezoid bone of carpus with a facet for the trapezium. Unciform with two inferior facets. Metacarpals three principal ones, and one, the fifth, rudimental ; the distal extremities of the second and fifth opposite ; the third a little longer. The dentition of t
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