432 



CEPHALOPODA. 



[amm. cm. 



Ammonites bellicosus, Morton, 1836, Ara. Jonr. 



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



recognized. 

 colubreUus, 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; kei-as, 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. 



Geo. Sur. Can., p. 310, Had. Riv. (Ir. 



This species is made the type of the 



genus Billingsites by Hyatt. 



Fig. 726.— Ascoceras canadense. 



newberryi, Billings, 1862, Pal. Fobs., 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. Foes., 

 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. 

 Cameroceras, Conrad, 1842, Jour. Acad. Nat. 

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

 chamber; keras, horn.] Shell straight, 

 and in form like Endoceras; siphuncle 



2^ 



marginal, and obliquely annulat. d at 



the junction of the septa. Typr 0. 



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.jbo£po*,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 0. virgatum. 

 arcualum, James, a 



poorly defined si- 



phunele of an I'.n- 



doceras. 

 clarkii, Wetherby, 



1881, Jour. Cin. 



Soc. Nat. Hist., vol. 



4, p. 77, Tren- „ ^ ~ 

 «. ' ', • r Fig. 727.— Colpoceras 



 t0n r " tt „ ,or rt clnrk.i. 



virgatum, Hall. 18.50, 

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

 Birdseye and Black Riv. Grt, 

 rhjiiiniin, Munster, 1839. [Ety. mytho- 

 logical name.] 



complanata, see Goniatites complanatus. 



erato, see (ioniatites erato. 

 Comities, Schlotheim, 1820, Petrefaktcn- 

 kunde, etc. [Fty. konos, cone, litlms, 

 stone.] 



capricornultis, Troost, 1840, 5th Geo. Rep. 

 Tenn. Not satisfactorily defined. 

 Conotubularia, Troost, syn. for Orthoceras. 



brongniarti, see Orthoceras brongniarti. 



cuvieri, see Orthoceras cuvieri. 



defrancii, see Orthoceras defrancii. 



goldfussi, see Orthoceras goldfussi. 

 Conulites, Cozzens, 1848. Not satisfactorily 

 defined. 



angidosum, Cezzens, 1848. Not satisfac- 

 torily defined. It may be a plant. 

 Cryploceras, 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 

 Cephalopods. 



capax, see Solenochilus capax. 

 Cyrtoceras, Gold fuss, 1832, in DelaBeche's 

 Handbuch der Geognosie bearbeitet 

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

 curved; keras, horn.] Shell long, 

 conical, gently curved, aperture pome- 

 times contracted; siphuncle straight or 

 expanded between the septa, and vari- 

 able in position, but usually at the 

 outer edge. 



absens, see Gomphoceras absens. 



