2lG 



pears as it were frofled, and not fo glofly, pofleffing ^fiib- 

 ^tmbilicus, and the outer margin of the aperture clofe to 

 the body is winged, or reflefted a little, forming a depref- 

 fion or /ulcus on that part. 



This beautiful fpecies is an elegant obje6l for the mi- 

 crofcope, rarely exceeding one-tenth of an inch in di- 

 ameter. 



We found feveral of thefe fhells amongfl the fand at 

 Bigberry bay, on the fouth coaft of Devon, 



If this is the fame as the B. punctata defcribed by Mr. 

 Adams, which we fufpe6l, it is found alfo on the fouth 

 fands at Tenbi^h. 



O' 



It is probable this, and all the open fpecies o^'BuUce, 

 are inclofed under the fkin on the back of fome molliifca 

 animal, like the Bulla o.perta and Haliotoidea. 



8- 

 Emarginata, Bulla tefla gibba apertura emarginata. Lin. Trans, v. t. 1. 



i.9. 10. l\.( Adams) 



Mr. Adams's obfervations on this (hell run thus: , 



Shell pellucid, fmooth: lip fub-arcuated. B. emargi- 

 nata, punEiata, and denticulata, agree in their general 

 habits; and truncata is moft nearly allied to cylindrica. 



Bulla 



