594 



PISCES. 



[CTE. DAC. 



porreotus, Cope, 1878, Pal. Bull. No. 29, 

 in Proc. Am. Phil. Soc., vol. 17, p. 527, 

 Permian. 



puxillus, Cope, 1878, Pal. Bull. No. 26, in 

 Pr..c. Am. Phil. Soc., vol. 17, p. 191, 

 Permian, 

 reticulatup, Newberry, 1875, Ohio Pal., vol. 



2, p. 60, Coal Meas. 

 serratus, Newberry, 1875, Ohio Pal., vol. 



2, p. 59, Coal Meas. 



CTENOPETALVS, Agassiz, 1869, Catal. FOBS. 

 Fish, Collection of Earl of Enniskillen, 

 in Geo. Mag., vol. 6. [Ety. ktemts, 

 comb ; pelalos, broad, full-grown.] The 

 serrated or denticulated crest distin- 

 guishes it from Petalodus, which it 

 much resembles, and to which it bears 

 about the Fame relation as Petalodus 

 does to Antlidus. Type C. serratus. 

 bellulus, St. John & Worthen, 1875, Geo. 



Sur. III., vol. 6, p. 398, St. Louis Gr. 

 limatulus, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 399, Kaskas- 

 kia Gr. 



medius, St. John & 

 Worthen, 1875, Geo. 

 Sur. 111., vol. 6, p. 400, 

 Kaska^kia Gr. 

 occidentals, St. John & 

 Worthen, 1875, Geo. 

 Sur. 111., vol. 6, p. 401, 

 Coal Meas. 



vinosus, St. John & 

 Worthen, 1875, Geo. 

 Sur. 111., vol. 6, p. 396, Keokuk Gr. 

 CTENOPTYCHIUS, Agassiz, 1843, li^cherches 

 pur les Poissons Fospilt s, t. 3, p. 99. 

 [Ety. klenos, comb; ptyche, wrinkle.] 

 Teeth small, highly polished, strongly 

 compressed, rounded or obtusely 

 pointed ; edge divided into several 

 strong dentirulations; base of crown 

 with a few imbricating folds of ganoine ; 

 bony root, oblong, flattened in the 

 same direction as the crown. Type C. 

 apicalis. 



cristatus, Dawson, 1868, Acad. Geol., p. 

 209, Coal Meas. 



Fio. 1120. Cteno- 

 pelalus oc<udent- 

 lls. Concave 

 face. 



FIG. 1121. Ctenoptyohiuserl-tatus. Natural size 

 aud magnified. 



digitatus, Leidy, 1856, Trans. Am. Phil. 



Soc., vol. 11, St. Louis Gr. 

 pertenuis, St. John & Worthen, 1875, 



Geo. Sur. 111., vol. 6. p. 382, Kaskas- 



kia Gr. 

 semicircularis, see Peripristis semicircu- 



laris. 



stevensoni, St. John & Worthen, 1875, 

 Geo. Sur. 111., vol. 6, p. 383, Coal Meas. 

 CYMATODUS. Newberry & Worthen, 1870, 

 Geo. Sur. 111., vol. 4, p. 363. [Ety. 

 cymatos, wavy; odous, tooth.] Teeth 

 small, oblong, or elliptical, thin, form- 

 ing a flat or arched plate, of which the 

 crown surface is transversely undu- 

 lated and uniformly punctate ; under 

 surface flat, smooth, at the posterior 

 end bearing a narrow, strap-shaped, 

 oblique root. Type C. oblongus. 



oblongus, Newberry & Worthen, 1870, 

 Geo. Sur. 111., vol. 4, p. 364, Up. Coal 



Meas. 



CYRTACANTHUS, Newberry, 



1873, Ohio Pal., vol. 1, 



p. 306. [Ety. kurlos, 



curved ; akantlia, spine.] 



Spine curved, tubercu- 



lated, single row of con- 

 ical denticles set on the 



posterior side, limited to 



the upper portion, and 



increasing 111 size from 



below upward- Type 



C. den tat us. 

 dentatup, Newberry, 1873, 



Ohio Pal., vol. 1, p. 307, 



Up. Held. Gr. 

 DACTYLODUS, Newberry & 



Worthen, 1866, Geo. 



Sur. 111., vol. 2, p. 33. 



[Ety. daktylo*, finger; 



odous, tooth.] Crown 



as in Petalodus; root 



conspicuous, and di- 

 vided into a number of 



radicles. Type D. priu- 



ceps. 

 concavus, St John & Fjo . , 122 ._ Cyrta . 



Woitnrn, lo/o, Lreo. canthus denta- 



Sur. 111., vol. 6, p. 390, tus. 



St. Louis Gr. 

 excavatus, St. John & Worthen, 1875, 



Geo. Sur. 111., vol. 6, p. 392, Kaskas- 



kia Gr. 

 inflexus, Newberry & 



Worthen, 1866, Geo. 



Sur. III., vol. 2, p. 



48, Kaskaskia Gr. 

 lobatus, Newberry & 



Wort hen, 1866, Geo. 



Sur. 111., vol. 2, p. 



47, St. Louis Gr. Fm 1123. -Dactyl o- 

 minimus, St. John & dtisconcavus. Con- 

 Wort hen , 1875, Geo. v face. 



Sur. III., vol. 6, p. 391, St. Louis Gr. 

 princeps, Newberry & Worthen, 1866, 



Geo. Sur. 111., vol. 2, p. 45, St. Louis Gr. 



