498 BULLA. 



Inhabits the coasts of Britain. Walker, 8tc. 



Shell a quarter of an inch long, and half as broad, white, 

 opake, wrinkled longitudinally, and becoming rather nar- 

 rower towards the apex. Mr. Montagu says it differs from 

 B. retusa, not only in being much larger, but also in the 

 produced volutions, in the aperture not reaching quite to the 

 top, and in being destitute of the regular longitudinal striae 

 on the upper part of the shell. 



