328 MOLLUSCA. SOLENOSTOMATA. 



SOLENOSTOMATA. 



I. Shell convoluted. The whorls are small segments of large 

 circles, wrapped round the pillar, the last formed one embra- 

 cing or inclosing the preceding one : aperttire lengthened. 



A. CoNUSiDiE. Shell compressedly convoluted ; aperture linear 



and simple, with a small lid. Proboscis long, tentacula 

 produced, with the eyes near the summit, on the out- 

 side. 



Conus. 



Terebellum. 



Seraphs. 



B. CyvRMxiije.. Shell, involute ; outer-lip incurved, plaited ; 



no lid. Cloak enlarged, and capable of folding over the 

 shell. 



Cyproea 



(Cypreovula.) 



C. OvuladjE. Shell involute ; both extremities of the aper- 



ture ending in a canal. Cloak enlarged, and capable of 

 folding over the shell. 



(Ovula.) 



Volva. 



Calpurna. 



D. VolutaDjE. Shell with a single anteal canal, not produ- 



ced ; pillar with oblique folds. 

 Voluta. 

 Volvaria. 

 Mitra. 

 Cancellaria. 



E. Marginellad^. Outer-lip thickened ; pillar plaited. 



Marginella. 

 Columbella. 



F. OtivADu^:. A spiral caUous ridge on the base of the body- 



whorl, joining the pillar. 

 Oliva. 

 Ancillaria. 



G. ToHNATELLAD^. Canal circumscribed, effuse. 



TomateUa. 

 Acteon. 



H. Bellerephon. Involute, aperture transverse, simple, 

 with a sinus in the outer -lip. 



