592 



PISCES. 



[CCEI,. COP. 



Fio. llll.-Cochliodus 

 coiilortus. 



the outer margin, convex above, con- 

 cave below, with porous grinding sur- 

 faces, as in P&mmoddB, from the ter- 

 mination of the vertical medullary 

 canals. Type C. contortus. 



costatu s, 

 Newbe r ry 

 &Worthen, 

 1870, Geo. 

 Sur. 111., 

 vol. 4, p. 

 364, Bur- 

 lington Gr. 

 erassus, New- 

 b'rry & 

 Wort hen, 

 1866, syn. 



for Sandalodus hevissimus. 

 latus, see Chitonodus latns. 

 leidyi, St. John & Worthen, 1883, Geo. 



Sur. 111., vol. 7, p. 127, Kas-kaskia Gr. 

 niliilus, pee Deltoptyclnus nilidus. 

 nobilis, Newberry & Wortl.en, syn. for 



Chitonodus latus. 

 obliquiiH, St. John & Worthen, 1883, Geo. 



Sur. 111., vol. 7, p. 126, St. Louis Gr. 

 occidmt'iHs, see I) Itodus occidentalis. 

 vanhornii, St. John & Worthen, 1883, 

 Geo. Sur. 111., vol. 7, p. 120, St. 

 Louis Gr. 



C<EL ACANTHI'S, Agassiz, 1836, Recherches 

 snr les Poissons Fossiles, t. 2, p. 170. 

 [Kty. koilvs, hollow ; ukantha, spine.] 

 Head plates sculptured; scales large, 

 imbricated, sculptured, artanged diag- 

 onally; two small dorsal fins support* d 

 on interspinous bones, the anteiiorone 

 a little f./rward of the ventral tin, and 

 the posterior one n arly opposite the 

 anal fin ; caudal flu equi-lobate, and 

 near its extremity a minute supple- 



FIG. 1112. Coelacanthuselegans. 



mental caudal ; vertebral column carti- 

 laginous, but neural arches and fin-nus 

 bony; teeth small, numerous, conical. 

 Type C. grunulosus. 



elegan->, New berry, 

 1856, Proc. Acad. 

 Nat, Sci. Phil., vol. 

 8, p. 98, ami Ohio 

 Pal., vol. 1, p. 339, 

 Coal Meas. 



ornatus, Newberry, 



1856, Proc. Acad. Fio. 1113.-Ccelaoan- 

 Nat. Sci. Phil., vol. "ins icroiiui<wi. 

 8, p. 98, and Ohio Magnified ,*ule. 

 Pal, vol. 1, p. 3-10, Coal Meas. 



robustup, Newberry, 1856, Proc. Acad. 

 Nat. !Sc,i. Pnil.. v'ul. 8, p. 9S, and Ohio 

 Pal., vol. 1, p. 341, Coal Me 



COMPSACANTIIUS, Newberry, 1857, Proc. 

 Acad. Nat. Sci., vol. 8, p. 99, and Ohio 

 Pal., vol. 1, p. 331. [Kty- compsos, ele- 

 gant ; akanth'i, a spine.] Spines small, 

 gently curved backward; exposed part 

 smooth, polished; section circular; 

 single row of remote, depressed hooks 

 on the posterior median line. Type C. 

 Ifevis. 



sevis, Newberry, 1857, Proc. Acad. Nat. 

 Sci. Phil., vol. 8, p. 99, and Ohio Pal., 

 vol. 1, p. 332, Coal Meas. 



FIG. 11M. Compsacanihuslsevis. 



Conch'opsis, ?yn for Crelacanthu?. 

 anguiifmis. syn. for CoBUteanthUfl elegans. 

 extintJienidticus, syn. lor Peplorhina an- 



thracina. 

 filiferus, syn for Ccelacaothus elegans. 



COXCIIODCS, Mc- 

 Coy, 1848, 

 Ann. and 

 Mag. Nat. 

 Hist., 2d. 

 per., vol. 2. 

 [Ety. con- 

 cAoi, shell ; 

 FIG. 1115 Oonchodu-i o^os tooth.] 



P' icatus - Teeth large, 



somewhat semicircular, pointed in 

 front, subtruncate behind, deeply con- 

 cave on the grinding surface; internal 

 margin straight, thickened, edg-> ab- 

 ruptly deflected ; external border con- 

 vex, much raised, undulato plicate, 

 ridg s larger in front, smaller poste- 

 rior; under surface polished, minutely 

 porous. Type C. o->treiformis. 

 plicatu, Dawson. 18b8, Acad. Geol., p. 



209, Co 1 Mta*. 

 COPODUS, Agassix, MSS., 

 1859, St. John & 

 Wort hen, 1883, Geo. 

 Sur. 111., vol. 7, p. 

 227. [Ety. knpis, 

 broad, curved knit'e; 

 o<1<nis, t 'oth.] Teeth 

 bilaterally sym- 

 metrical, pp-imiing 

 the ja\v without 

 m< sia-1 suture, ar- 

 ranged in single, 

 longitudinal series 

 from behiinl back- 

 ward ; lateral bor- 

 ders converging an- 

 teriorly; coronal 

 region arched ; rim 



at bace; ant-rior F|(J me. - Copodus 

 and posterior walls cornmns. Maxtl- 

 vertical, channeled ; Jury form, a, Trlt- 

 inferior surface " niling surf " ce; *' 



concave; porous 

 beneath the enam- 

 eled coronal sur.ace. 

 nutus. 



iransverse proHle; 



longliudiual pro- 

 Type C. 



cor- 



