432 



CEPHALOPODA. 



[AMM. CYR. 



Ammonites bellicosus, Morton, 1836, Ara. Jonr. 



Sci. and Arts, vol. 29, Coal Meas. Not 



recognized. 



colubrellus, see Goniatites colubrellus. 

 hildrethi, see Goniatites hildrethi. 

 ASCOCERAS, Barrande, 1855, Bull, de la Soc. 



Geol. de France, vol. 12, 2d ser., p. 157. 



[Ety. askos, leather bottle ; keras. horn.] 



Chambers behind the living one short 



and rapidly tapering; living chamber 



long and constricted near the aperture ; 



aperture somewhat T-shaped. Type A. 



bohemicum. 

 anticostiense, Billings, 1866, Catal. Sil. 



Foss. Antic., p. 60, and Pal. Foss., vol. 1, 



p. 164, fig. 148b, Anticosti Gr. 

 canadense, Billings, 1857, Rep. of Progr. 



Gep. Sur. Can., p. 310, Hud. Riv. Gr. 



This species is made the type of the 



genus Billingsites by Hyatt. 



FIG. 726. Ascoceras canadense. 



newberryi, Billings, 1862, Pal. Foss., vol. 

 1, p. 163, Hud. Riv. and Anticosti Grs. 



southwelli, Worthen, (in press,) Geo. Sur. 

 111., vol. 8, p. 151, Niagara Gr. 



townsendi, Whiteaves, 1884, Pal. Foss., 



vol. 3, p. 41, Guelph Gr. 

 BACTRITES, Sandberger, 1841, Leonh. u. 

 Bronn's Jahrb., p. 240. [Ety. baktron, 

 staff.] Shell long, straight, gradually 

 tapering, many- chambered; sutures 

 curve abruptly backward over the si- 

 phuncle, forming "the dorsal lobe" 

 similar to that of a Goniatites. Type B. 

 carinatus. 



clavus, Hall, 1879, Pal. N. Y., vol. 5, pt. 2, 



p. 316, Ham. Gr. 



CAMEROCKRAS, Conrad, 1842, Jour. Acad. Nat. 

 Sci. Phil., vol. 8, p. 267. [Ety. kamara, 

 chamber; keras, horn.] Shell straight, 

 and in form like Endoceras; siphuncle 



FIG. 727. Colpoceras 

 clarkii. 



marginal, and obliquely annulati d at 

 the junction of the septa. Type C. 

 trentonense. 



trentonense, Conrad, 1842, Jour. Acad. Nat. 

 Sci. Phil., vol. 8, p. 267, and Pal. N. Y., 

 vol. 1, p. 221, Trenton Gr. 

 COLPOCERAS, Hall, 1850. 

 3d Rep. N. Y. Mus. 

 Nat. Hist., p. 181. 

 [Ety.&opos,furrow ; 

 keras, horn.] Dis- 

 tinguished from 

 Orthoceras by the 

 oblique septa, 

 arched upon the 

 dorsal side, and 

 bending down in a 

 deep sinus on the 

 ventral side, and 

 strongly arching 

 toward the mouth. 

 Type C. virgatum. 



arcualum, James, a 

 poorly defined si- 

 phuncle of an En- 

 doceras. 



clarkii, Wetherby, 

 1881, Jour. Cin. 

 Soc. Nat. Hist., vol. 

 4, p. 77, T r e n - 

 ton Gr. 



virgatum, Hall, 1850, 

 3d Rep. N. Y. Mus. Nat. Hist., p. 182, 

 Birdseye and Black Riv. Grs. 

 Clymenia, Munster, 1839. [Ety. mytho- 

 logical name.] 



complanata, see Goniatites complanatus. 



erato, see Goniatites erato. 

 Conilites, Schlotheim, 1820, Petrefakten- 

 kunde, etc. [Ety. konos, cone, lithos, 

 stone.] 



capricornulus, Tropst, 1840, 5th Geo. Rep. 



Tenn. Not satisfactorily defined. 

 Conotubularia, Troost, syn. fur Orthoceras. 



brongniarti, see Orthoceras brpngniarti. 



cuvieri, see Orthoceras cuvieri. 



defrancii, see Orthoceras dffrancii. 



goldfussi, see Orthoceras goldfussi. 

 Conulites, Cozzens, 1848. Not satisfactorily 

 defined. 



angulosum, Cozzens, 1848. Not satisfac- 

 torily defined. It may be a plant. 

 Cryptoceras, D'Orbigny, 1850. [Ety. kryptos, 

 concealed; keras, horn.] This name 

 was preoccuppied by Latreille for a ge- 

 nus of insects, and had been previ- 

 ously used by Barrande for a genus of 

 Cephalopoda. 



capax, see Solenochilus oapax. 

 CYRTOCERAS, Gold fuss, 1832, in DelaBeche's 

 Handbuch der Geognosie bearbeitet 

 von v. Deschen, p. 536. [Ety. kurlos, 

 curved; keras, horn.] Shell long, 

 conical, gently curved, aperture some- 

 times contracted; siphuncle straight or 

 expanded between the septa, and vari- 

 able in position, but usually at the 

 outer edge. 



absens, see Gomphoceras absens. 



