. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Pig. 1035.—Olenoldes (ordi, Walcott, 1887, Am. .Tour. Sci. and Arts, 3(1 ser., vol. 34, p. 105, hcvis, Walcott, 1886, Bull. Geo. Sur., No. 30, p. 187, Up. Taconic. nevadensis. Meek, 1870, (Para- doxides nevadensis,) Proc. Acad. Nat. Sci. Phil., p. 62, and Geol. Expl. 40th Par., vol. 4, p. 23, Up. Taconic. quadriceps. Hall & Whitfield, 1877, (Dicelloceplialus quad- riceps,) Geol. Ex
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Pig. 1035.—Olenoldes (ordi, Walcott, 1887, Am. .Tour. Sci. and Arts, 3(1 ser., vol. 34, p. 105, hcvis, Walcott, 1886, Bull. Geo. Sur., No. 30, p. 187, Up. Taconic. nevadensis. Meek, 1870, (Para- doxides nevadensis,) Proc. Acad. Nat. Sci. Phil., p. 62, and Geol. Expl. 40th Par., vol. 4, p. 23, Up. Taconic. quadriceps. Hall & Whitfield, 1877, (Dicelloceplialus quad- riceps,) Geol. Expl. 40th Par., vol. 4, p. 240, Up. Taconic. spinosus, Walcott, 1885, (Ogygia spinosa,) Mon. U. S. Geo. Sur., vol. 8, p. 63, Up. Taconic. stissingensis, Dwight, 1889, Am. Jour. Sci. and Arts, 3d ser., vol. 38, p. 147, Up. Taconic. typicclis, Walcott, 1886, Bull. U. S. Geo. Sur. No. 30, p. 183, Up. Taconic. wahsatchensis. Hall & Whitfield, 1877, (Dicellocephalus wahsatchensis,) Geol. Expl. 40th Par. vol. 4, p. 241, Up. Ta- conic. Olenus, Dalman, 1820, Uber die Pahcaden oder die sogenannten Trilobiten, p. 54. Not an American genus. t logani, see Loganellus quebecensis. thompsoni, see EUiptoccphala thompsoni. unduloslriatus, see Elliptocephala undu- lostriata. vermonlana, see Mesonacis vermontana. OBYfTOCEHirALus, Walcott, 1886, Bull. U. ri. Geo. Sur. No. 30, p. 210, [Ety. oryktos, furrowed; kephale, head.] Glabella ob- long, transversely lobed; eyes cpiiinil, narrow, ocular ridges connecting with the axial furrow about the .'in. hella; facial suture marginal in fintit, and cutting the posterior margin within. Fio. lODO.—()ryctoceplialUH Nlileld. prlmuH. CcpliiiUc the postero-lateral angles; free cliccks spinous; pygidium with segiin'iiliMl axis and pleural lobes ; margin spinous. Type O. iirimus. primus, Walcott, 188G, Bull. U. S. (Jeo. Sur. No. 30, p. 210, Up. Taconic. , Moek & Worthen, 1805, Proc. Acad. Nat. Sci. Phil., p. 48. [Ety. palains, an-
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