65 
VOLUTA. 
GENERIC CHARACTER: The shell oval, more or less 
inflated ; apex blunt or papillary; the base notched; no 
ca nal. Columella plaited ; the plaits parallel, transverse, 
the lower smallest; columellar lip thin and formed on the 
.Pillar. 
v - CATENA TA. Mont. Test. Brit., vol. 1, p. 236. Flem. 
®6t. An., p. 333. 
Montagu acknowledges his obligations to Mr. Swainson for 
a 'l he knew of this shell. The latter gentleman’s observations 
^ re > ‘‘I never found this shell alive; I got three or four 
( ® a d specimens, in the sediment at the bottom of pools of 
^ater (if they may be so called) left in the holes of the 
j^cks in St. Austle bay, near Fowey ; have heard of its 
e ' n g 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 
* c olumella nearly equal. 
M. VOLUTA. Cyprasa V. Mont. Test. Brit., vol. 1, 
P- 203, pi. 6, fig. 7, anil Bulla Diapbaoa, Mont. Test. Brit., 
*ol. l, p . 225, pi. 7, fig. 8. 
Montagu found a mutilated specimen of his Bulla Dia- 
^ 'ana, now judged to be the former species in its younger 
ate > at Falmouth; and I have obtained specimens of both 
a a ' es from the Land’s-end. The difference between M. V. 
: o . B. D., is so great, that close observation of many 
Mviduals is necessary to prove them the same. 
VOLVARIA. 
GENERIC CHARACTER: The shell cylindrical, con- 
volute; spire scarcely projecting; aperture narrow, the 
* etl gth of the shell. One or more folds on the lower part 
the columella. 
' PALLIDA. Volula P. Turt. Lin. Mont. Test. Brit., 
V°1.2, p.232. V. P. Flem. Brit., An., p. 333. Crouch’s 
ltu ro., pi. 19, fig. 15. Very rare. 
CONVOLUTA. 
a * le shell without a canal, but having the base of the 
^PcrtQfe chanelled or effuse; the whorls large, compressed, 
t "olut e> the last nearly covering the whole of the others. 
q CYPRA3A. 
ENEric CHARACTER: The shell oval, or ovate 
oblo Dgj convex; the lips curved inwards; aperture longi- 
odinal, narrow, toothed on both sides, the extremities 
C Use - Spire very small, hardly perceptible. 
K 
