BYT. CHI.] 



PISCES. 



589 



Asterolepis, but distinguished by the 

 course of the furrows and shape of 

 the plates; it lias longer articulating 

 plates in the limb or arm, and hns been 

 otherwise distinguished, though i Wely 

 related to botli genera. Type B. or- 

 natus. 



canadensis, AVhiteavep, 1880, (Pterichthys 

 canadensif,) Am. Jour. Sci. and Arts, 

 3.1. sen, vol. 20, p. 135, Up. Devo- 

 nian. 



BYTIIIACANTITCS, St. John & AVorthen, 1875, 

 Geo. Sur. III., vol. (i, p. 444. [K y. 

 bythiox, deep ; akantha, ppine.] Fin 

 ppmes deeply imbedded, laterally com- 

 pressed, exposed part recumbent, 

 tuberculated ; posterior face low, keeled ; 

 pulp cavity forming a deep channel in 

 the posterior side of the base. Type B 

 vanhornii. 



sideiiu^, LHdy, 1873, (Asteracanthns sid- 

 erin.s,) Ext. Vert, Fauna, p. 313, St. 

 Lou s Or. 



vanhornii, St. John & Worthen, 1875, 

 Geo. Mir. 111., vol. 6, p. 445, St. 

 Louis Gr. 



CALOI-ODPS, St. John & Worthen, 1875, GPO. 

 Snr. Ill, vol. 6, p. 403. [Ely. kalus, 

 beautiful ; odous, tooth.] 

 Teeth in geneial f >rm 

 like Petalodus, but dis- 

 tinguished by the tur- 

 gid, 8ul>coniral, unsym- 

 metiu'al crown. TypeC. 

 picaiiR 



apicalis, St. John & Wor- Fio llOo Caio- 

 then, 1875, Geo. Sur. 111., }*' du V pica o 

 vol. 6, p. 403, Middle diam. B ' 

 Coal M as. 



CABCHAI:OPSIS, Agassiz, 1843, Recherches sur 

 JHS Po ssons Fossiles, vol. 3, p. 313. 

 [Ety. carcharops's, shaik-like.] P.in- 

 cipal cusps very strong, erect, com- 

 pressed in front, rounded behind, 

 broadly expanded at base; lateral an- 

 gles sharp, crenulated ; extremities oc- 

 cupied by isolated, conical, lateral 

 denticles; coional faces smooth or 

 faintly striattd vertically; base in out- 

 "linelikeClado- 

 dus, moder- 

 ately produced 

 and broadly 

 rounded poste- 

 riorly; anterior 

 face sinuous, 

 termi n a ti ng 

 below in a 

 ridge; inft-rior 

 surface exca- 



. 1106.-Caro. 1 aropsis 



woniieui. . 



wortheni, .New- 



berry, 1866, Geo. Sur. 111., vol. 2, p. 69, 

 Subcarboniferous. 



CBPHALASPJS, Agas-siz, 183(5, Recherch. Pois. 

 FOBS., t. 2, p. 135. [Ety. kepliale, head; 

 aspis, shield.] Entire bkVleton exteinal ; 

 head shield very large, subcrescent- 



iform when depressed but in better, 

 condition showing an arching over 

 thetopofthe 

 head, cov- 

 ered with 

 d i sc oi dal, 

 scul plured, 

 bony platep, 

 with the 

 crescent 

 horns d i - 

 reot'd back- 

 waid; eyes 

 large, ellip- 

 tical, on eai h 

 side of the 

 upper cen- 

 tral {art of F(o _ 1107 __,. e p halnsp | S 

 tl)6 head; Hemt >hieia deprt-s.-ed. and 

 bodyr?pidly snowina the jointedangular 

 tapering, an- outliue of part of the body, 

 gularon top, 



and presenting a jointed appearance 

 somewhat 1 ke a trilobite; doisal, anal, 

 and caudal (in, the latter like a paddle 

 or oar. Type C. lyelli. 



campbeltonenhis, Whiteaves, 1881, Can. 

 Nat., vol. 10, Devonian. 



dawsoni, Lankester, 1870, London Geo. 



Mag., Devonian. 



CERATODCS, Apasiz, 1833, Recherches sur 

 les Poi?sons Fossiles, t. 1, p. 129. [Ety. 

 keras, horn ; oluvs, tooth.] Teeth large, 

 thick, longer than wide, veiy poious; 

 crown transversely sulcated. Type C. 

 latii-simus. 



favo.Mis, Cope, 1884, Pal. Bull., No. 39, p. 

 28, Permian. 



paucicristatus, Cope, 1877, Proc. Am. Phil* 

 Soc., p. 54, Permian. 



vinslovii, Cope, 187G, Proc. Am. Phil. Soc., 



p. 410, Permian. 



Cliiroilus, McCoy, 1848, Ann. and Mag. Nat. 

 Hist, vol. 2, p. 130. [Ety. clirir, the 

 hand ; nitons, tooth.] Tooth fan-shaped, 

 thick, flattened ; anterior broad, margin 

 deeply divided into lobes; inner nearly 

 straight margin has a small, recurved, 

 thumb -li-k lobe projecting ntaily at 

 right angles from tiie middle of its 

 length, preventing the mesial junction 

 of the tiitors of each side of the jaw; 

 inner marginal lobe the lorg< r; surface 

 minutely punctured. Type C. pesiana). 

 Not d finitely known in America. 



acutas, Newberry, 1857, Proc. Acad. Nat. 

 hci., vol. 8, p. 99, Coal Meas. Too poorly 

 defined to warrant recognition. 

 CniROLEPis, Agassiz, 1833, Recherchfs sur 

 les Poissons Foshiles, t. 1, p. 128. [Ety. 

 cheir, hand ; left*, ecale.] B'nes 01 the 

 head t-culptured ; j-houlder-bone and 

 fins osseous; pectorals large, leaching 

 near the ventral fin, and ventral reach- 

 ing near the aral fin; doisal fin small 

 and opposite the posterior pait <f the 

 anal fin; tail well-developed, principally 

 on the lower side ; scales small, sculp- 



