207 



chefnut; no external volution, but in its place an Umbi- 

 licus: aperture moderately wide: on the lower end of 

 the pillar lip the (hell is thickened, of an opaque white 

 colour ; but this duplicature does not fpread up the body 

 of the (hell, as in the B. lig;naria: Columella not vifibie 

 to the end. We found two or three of this fpecies in fand 

 from Falmouthhz.rhoux , thelargeft not above three-eighths 

 of an inch in length : foreign fpecimens grow to a much 

 fuperior fize. PolTibly this is the fame as defcribed by 

 Mr. Pennant for a young fliell of the B. Ampidla ; who 

 fays it was found near ri'''q)'?7zozt//i. Da Costa has con- 

 fidered Mr. Pennant's fliell as his B. Navicida, the Hy- 

 datis of Linn^us. 



^ 3. 



Bulla patula. Br. Zool. t. 70. f. S5. A. Patula. 



Piilt. Cat. Dorfet. p. 40. 



B. with a fmooth, glody, white, pellucid, oblong, in- 

 voluted fliell, upper end extending beyond the body; 

 bale more extended ; aperture large, terminating in a 

 fliort canal or gutter at each end, molt contra6ied at the 

 top: Columella iW\{\td, forming ^ fub -umbilicus or fur- 

 row on the pillar lip : outer lip plain, and very thin. Mr. 

 Pennant firfl; defcribed this fpecies from the Portland 

 Cabinet, Vdken diX. Weymouth. Do6ior Pulteney favour- 

 ed us with a fpecimen from the fame place, the length of 

 which is an inch, breadth half an inch. 



The anim >1 belonging to this fliell is faid to poflefs a 



gizzard, fimilar to that of the Lignaria. 



Bulla 



