. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Via. 1120.—Edestus vorax. Elonichthyt peltigerm, see Pahconiscus pelti- gerus. Erismacanthus, McCoy, 1848, Ann. and Mag. Nat. Hist., 2d scries, vol. 2, p. 119. [Ety. ereisma, a prop or stay; amntha, spine.] Spine of three parts ; one com- pressed, finely striated, which entered i the flesh; the second short, compressed, j rapidly tapering, curved backward, j sides with longitudinal ridges, and two rows of downward
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Via. 1120.—Edestus vorax. Elonichthyt peltigerm, see Pahconiscus pelti- gerus. Erismacanthus, McCoy, 1848, Ann. and Mag. Nat. Hist., 2d scries, vol. 2, p. 119. [Ety. ereisma, a prop or stay; amntha, spine.] Spine of three parts ; one com- pressed, finely striated, which entered i the flesh; the second short, compressed, j rapidly tapering, curved backward, j sides with longitudinal ridges, and two rows of downward curved teeth on the posterior concave margin; the third, a prop-like part extending forward nearly at right angles with^ the base, arched, compressed at the basal half, depressed distally, and covered with tubercles and some spines on the under side. Type E. jonesi. maccoyanuB, St. John & Worthen, 1875, Geo. Sur. 111., vol. 6, p. 461, St. Louis Gr. EoNEMACANTHDS, St. John & Worthou, , Geo. Sur. 111., vol. 7, p. 120. [Ety. eu, beautiful; nema, a line; akandia, spine.] DiRtinguished from Ctenacanthus by the plain dorsal ridge, tuberculated in- tercostal sulci, and upward direction of the denticles on the angles of the pos- terior face. Type E. costatus. costatus, Newberry & Worthen, 1866, (Ctenacanthus costatus,) Geo. Sur. 111., vol. 2, p. 120, St. Louis Gr. Edbylkpis, Newberry, 1866, Proc. Acad. Nat. Sci. Phil. [Ety. euryt, broad; lepia, scale.] Small; body fusiform; head obtuse; tail elongated, lobes unequal: fins small, with delicate fulcra: dorsal and anal fins opposite, and far back on the body; vcntrals near middle of abdo- men ; cranial surface tubercular; max- illary, mandibular, and jugular plates corrugated; scales smooth, ornamented, or serrated; teeth numerous, conical, short. Type E. tuberculata. corrugata, Newberry, 1856, Proc. Acad. Nat. Sci. Phil., and Ohio Pal., vol. 1, p. 360, Coal Meas. granulata, Newberry, 1866, Proc. Acad. Nat. Sci. Phi
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