328 
MOLLUSCA. SOLENOSTOMATA. 
SOLENOSTOMATA. 
I. Shell convoluted. The whorls are small segments of large 
circles, wrapped round the pillar, the last formed one emhra-. 
cing or inclosing the preceding one : aperture 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. CypHiEAD^. Shell, involute ; outer-lip incurved, plaited ; 
no lid. Cloak enlarged, and capable of folding over the 
shelL 
Cyprsea 
(Cypreovula.) 
C. OvuLADiE. 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. VoLUTADuE. Shell with a single anteal canal, not produ- 
ced ; pillar with oblique folds. 
Voluta. 
Volvaria. 
Mitra. 
Cancellaria. 
E. MARGiNELLADiE. Outer-lip thickened ; pillar plaited. 
^ Marginella. 
Columbella. 
F. Olivad.®. a spiral callous ridge on the base of the bod}^- 
whorl, joining the pillar. 
Oliva. 
Ancillaria. 
G. TornatelladjE. Canal circumscribed, effuse. 
Tornatella. 
Acteon. 
H. Bellerephon. Involute, aperture transverse, simple, 
with a sinus in the outer -lip. 
