BELEMNITID^l : CONOTEUTHIS, BELEMNOTETJTHIS. 119 



B. Shell conical, covered with an externally deposited Coat, forming 

 a more or less elongated cylindrical Style. 



a. External Coat thin. 



2. Belemnoteuthis. 



b. External Coat forming an elongate Style. 



3. Actinocamax. The conical cavity in the style with an elon- 



gated longitudinal fissure on the lower side. 



4. Belemnites. The conical cavity in the style with an entire 



edge and no longitudinal figure. 



A. Shell conical, thin, naked, not covered with, any externally deposited 

 Coat; probably produced behind into a long, slender, dorsal plate. 



1. CONOTEUTHIS. 



Animal ■ ? — Shell. Cone broad, rapidly enlarging, thin, 



horny, smooth, marked with very slight rather oblique concen- 

 tric lines of growth, not covered with any externally deposited 

 calcareous coat, with a well marked strong longitudinal keel on 

 the middle of the back (probably produced into a slender elon- 

 gated dorsal style). Septa transverse smooth. 



Conoteuthis UOrb. An. Set. Nat. xvii. t. 12. f. 1. 5. 1842, Paleont. 

 univ. t. 30., Paleont. Franc, t. 1 . supp., Moll. Viv. et Fos. i. 444. 

 t. 32. ; Desh. in Lamck. Hist. 240. 



1. Conoteuthis Dupinianus. 



Conoteuthis Dupinianus D'Orb. An. Sci. Nat. xvii. t. 12. f. ]. 5., 

 Paleont. univ. t. 30., Moll. Viv. et Fos. i. 444. t. 32. 



Fos. Paris Basin. 



B. Shell conical, thin, covered with a more or less thick externally 



deposited Coat. 



a. Outer Coat thin, merely covering the Shell. 



2. BELEMNOTEUTHIS. 



Animal elongate, subcylindrical. Fins lateral, rounded. Arms, 

 sessile and peduncled, armed with two scries of hooks (and round 

 cups?). — Shell internal, conical, thin, elongate, subcylindrical; 

 apex conical, chambered ; septa concave, even edged. Siphon 

 near the edge of the septa, the conical upper part covered ex- 



