BELEMNOPHOUA. 43 



plangon, Gray. Sinope, Gray. 



Rouxii, D'Orh. tuberculata, Lam. 



rupellaria, UOrh. andFerus. vermiculata, Quoy and Gaim. 



Savignii, Blainv. Vicellius, Gray. 



Sub-gen. SEPiELLA, Gray. 



Shell oblong, posterior end expanded, produced, cartilaginous^ 

 not beaked, convex beneath. 



Capensis, UOrh. Myrsus, Gray. 



elegans, UOrh. Orbignyana, Ftrus. 



Indica, D'Orh. and Ferus. ornata, Rang. 



Mestus, Gray. rostrata, UOrh. 



microcheira. Gray. Sinensis, D'Orh. 



Doxihtful Species. 

 Antillarum, D'Orh. mucronata, Rafin. 



Sub-order BELEMNOPHORA. 



Shell calcareous, internal, chambered ; chamber tra- 

 versed by a siphon. 



The greater number of genera in this sub-order are fossil, 

 as the Beloptera and Spirulirostra, which have the apex of 

 the shell enveloped in a thickened lamellar coat produced 

 behind ; the ConoteutMs, which has a strong longitudinal 

 keel on the middle of the back ; the Belemnoteuthis, where 

 the shell is thin and conical, and covered with an external 

 coat ; Actinocamax, where the coat is produced, forming a 

 cylindrical style with its cavity fissured ; and BeUmnites, in 

 which the conical cavity of the style is entire and without 

 any fissure. 



