65 

 VOLUTA. 

 GENERIC CHARACTER: The shell oval, more or less 

 inflated ; apex blunt or papillary ; the base notched ; no 

 canal. Columella plaited ; the plaits parallel, transverse, 

 the lower smallest; columellar lip thin and formed on the 

 pillar. 

 V. CATENATA. Mont. Test. Brit., vol. 1, p. 286. -Flem. 

 Brit. An., p. 333. 



Montagu acknowledges his obligations to Mr. Swainson for 

 all he knew of this shell. The latter gentleman's observations 

 are, ''I never found this shell alive; I got three or four 

 dead specimens, in the sediment at the bottom of pools of 

 water (if they may be so called) left in the holes of the 

 rocks in St. Anstle bay, near Fowey ; have heard of its 

 being taken off the Lizard, and also at Penzance." 



MARGINELLA. 



GENERIC CHARACTER: The shell ovate oblong, 



smooth; spire short; right lip thickened on the outside; 



base of the aperture scarcely notched ; plaits on the 



columella nearly equal. 

 •M. VOLUTA. Cypra?a V. Mont. Test. Brit., vol. 1, 



p. 203, pi. 6, fig. 7, and Bulla Diaphana, Mont. Test. Brit., 



vol. 1, p. 225, pi. 7, fig. 8. 



Montagu found a mutilated specimen of his Bulla Dia- 

 phana, now judged to be the former species in its younger 

 state, at Falmouth; and I have obtained specimens of both 

 stales from the Land's-end. The difference between M. V. 

 and B. D., is so great, that close observation of many 

 individuals is necessary to prove them the same. 



VOLVARIA. 



GENERIC CHARACTER: The shell cylindrical, con- 

 volute; spire scarcely projecting; aperture narrow, the 

 length of the shell. One or more folds on the lower part 

 of the columella. 



V. PALLIDA. Voluta P. Turt. Lin. Mont. Test. Brit., 

 vol. 2, p. 232. V. P. Flem. Brit., An., p. 333. Crouch's 

 Intro., pi, 19, fig. 15. Very rare. 



CONVOLUTA. 



The shell without a canal, but having the base of the 

 aperture chanelled or effuse; the whorls large, compressed, 

 convolute, the last nearly covering the whole of the others. 



CYPR^A. 

 GESERIC CHARACTER: The shell oval, or ovate 

 oblong, convex ; the lips curved inwards ; aperture longi- 

 tudinal, narrow, toothed on both sides, the extremities 

 effuse. Spire very small, hardly perceutible. 



K 



