138 
reticulated, appearing as if covered with fine gauze, 
circumference of the upper part somewhat constricted 
(as ifa thread had been tightly tied round it) ; colu- 
mellar margin arcuated, a littie reflected and in the 
middle of it a flexure or notch; apex rather rounded 
and slightly umbilicated. 0,30...0,20. Budleigh, 
Salterton, Devon. 
B. Catrenata. Forbes.—Buuua C. Mont. p. 215. 
t.7.f. 7.—D. p. 478.—Punctata. variety, F. p. 
294.—Pellucid, white, glossy, closely and finely stria- 
ted transversely all over, the strie when magnified seem 
interwoven or formed into links like a chain; apex ob- 
tuse with a visible involution ; aperture extremely large, 
occupying nearly the entire length of the shell; var. 
Frosted, less diaphanous, with a more transparent zone 
taking in eight or ten of the catenze which are more 
strongly defined; subumbilicated. 0,10. Devon, rare. 
BULLA. 
Ovate-globose, involute, devoid of columella or pro- 
jecting spire ; aperture the entire length of the 
shell, outer lip with an acute edge. 
B. Lienarta. Lin, 1184.—Lam. 1.—D. p. 480.— 
Bl. t. 45. f. 8.—List. t. 714. f. 71.—Knorr. 6. t. 
37- f.4.—Mont. t. 194,5.—Pen. 4. p: 116.—Mont. 
