. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 690 PISCES. [ iured, and ranged diagonally in wavy lines. Type C. trailli. canadensis, Whiteaves, 1881, Am. Jour. Sci. and Arts., 3d ser., vol. 21, p. 496, Up. Devonian. CiiiTONODUS, St. John & Worthen, 1883, Geo. Siir. 111., vol. 7, p. 109. [Ely. chiton, a smock or coat; odous, tooth.] Mandib- ular posterior teeth trapezoidal, arched in the direction of inrollment; median teeth narow, inrolled longitu
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 690 PISCES. [ iured, and ranged diagonally in wavy lines. Type C. trailli. canadensis, Whiteaves, 1881, Am. Jour. Sci. and Arts., 3d ser., vol. 21, p. 496, Up. Devonian. CiiiTONODUS, St. John & Worthen, 1883, Geo. Siir. 111., vol. 7, p. 109. [Ely. chiton, a smock or coat; odous, tooth.] Mandib- ular posterior teeth trapezoidal, arched in the direction of inrollment; median teeth narow, inrolled longitudinally; maxillary posterior teeth subquadrilat- eral, arched, and inrolled along the outer margin. Type C. spingeri. aiitiquus, St. John & Worthen, 1883, Geo. Sur. 111., vol. 7, p. 116, Low. Burling- ton Gr. latns, Leidy, 1856, (Cochliodns latus,) Trans. Am. Phil. Soc, vol. 11, p. 87, pi. 5, fig. 17, Keokuk Gr. liratus, St. John & Worthen, 1883, Geo. Sur. IH., vol. 7, p. 119, St. Louis Gr. rngosuR, Newberry & Worthen, 1866, {Pcei;ilodns rugosus, P. ornatus, and P. coiivolutus,) Geo. Sur. 111., vol. 2, pp. 94, 95; vol. 4, p. .366. Keokuk Gr. spingeri, St. John & Worthen, 1883, Geo. Sur. 111., vol. 7, p. 112, Up. Burling- ton Gr. tribulis, St. John & Worthen, 1883, Geo. Sur. HI., vol. 7, p. 117, Keokuk Gr. Cholodus, St. John & Worthen, 1875, Geo. Sur. 111., vol 3, p. 415. [Ety. cholos, de- fective ; odous, tooth.] Distinguished from Peltodus and Fissodus, by the eccentrically lobed crest and extreme downward pro- longation of the lateral extremities of the coronal fold in the convex face. Type C. intequalis. inicqualis, St. John & Worthen, 1875, Geo. Sur. 111., vol. 6, p. 416, Coal Meas. Chomatodus, Agassiz, 1843, Recherches sur les Poissons Fossiles, t. 3, p. 107. [Ety. choma, a pile or heap; odous, tooth.] Teeth transversely much elongated, compressed,and depressed; crown hav- ing the homologous parts of Petalodus, and the form and structure of P
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