. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 684 H ATRAC HI A. [OPH.—I HI. pectinatm, Cope, nee I'tyoniiia pectinatun. rectidens, Cono, 1874, TraoH. Am, , and Ohio Pal., vol. 2, p. m\, Coal Meas. ruinex, Cone, 1808, Proc. Acad. Nat. 8cl. p. 217, (Bauropleura retnex,) Ohio Pal., vol. 2, p. 381, Coat Meas. terrula, nee PtyoniuH Berrula. vinchellanus, see Ptyoniua vinchellanus. Opiiiacodon, Marah, 1878, Am. Jour. Hci. and Artfl, 8d ser., vol. 16, p. 411.
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 684 H ATRAC HI A. [OPH.—I HI. pectinatm, Cope, nee I'tyoniiia pectinatun. rectidens, Cono, 1874, TraoH. Am, , and Ohio Pal., vol. 2, p. m\, Coal Meas. ruinex, Cone, 1808, Proc. Acad. Nat. 8cl. p. 217, (Bauropleura retnex,) Ohio Pal., vol. 2, p. 381, Coat Meas. terrula, nee PtyoniuH Berrula. vinchellanus, see Ptyoniua vinchellanus. Opiiiacodon, Marah, 1878, Am. Jour. Hci. and Artfl, 8d ser., vol. 16, p. 411. [Kty. ophiaho», belonging to serpents; mom, tooth.] Type 0. grandis. grandis. Marsh, 1878, Am. .Tour. Hci. and Arts, :M ser., vol. 16, p. 411, Permian. mirus. Marsh, 1878, Am. Jour. Sci. and Arts, 3d ser., vol. 15, p. 411, Permian. Omithichnitea, Hitchcock, 1836, Am. Jour. Sci. and Arts, vol. 29. [Kty. omithon, a bird; ichnoa, a footstep.] This is not properly a generic name. No bird-tracks are known in Palii^ozoic rocks. The Batracliian tracks referred to it belong to another genuH. cidbertHoni, King, 1845, Am. Jour. Sci. and ArtH, vol. 48, p. ;M5, Coal Meas. gatlinntoides, King, 1845, Am. Jour. Sci. and Arts, vol. 48, p. 344, Coal Meas. , Cope, 1881, Bull. U. 8. (Jeo. Sur. Terr., vol. 0, No. 1, p. 7». [Ety. pan, all; tylos, a knob.] Founded upon the crania; ossification tiomplete, leaving only orbits, nostrils, and parietal fonta- nel ; surface sculptured; mandible witti an angular process; teeth conic, obtuse, larger anteriorly ; mandible sup- porting several rowH of teeth, which oppose a pavement of obtuse teeth on the palate; these are situated on the Ealatine or anterior part of pterygoid ones; quadratojugal and malar bones well developed; no lyra or mucous grooves. Type P. cordatus. cordatUH, Cope, 1881, Bull. U. 8. Geo. Sur. Terr., vol. 0, p. 79, Permian. PARioTiciitis, Cope, 1878, Pal. Bull., No. 29, and Proc. Am. Phil. Soc, vol. 17, p. 608. [Ety. vare
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