234 



V. with a very thin, brittle fliell, with two fmall fpires. 

 Inhabits the ifle of J7'^/za, ov Y Columb-kil. 



This is all Mr. Pennant fays of the fliell. Was it 

 not placed in the Britijh Zoology as a Valuta, we (liould 

 have been inclined to think it a variety of our Bulla di' 

 aphana. 



4. ** ~ 



DeNTICulata. Turbo bidentata. ^'alL Mia. Shells, f. 50, & f, 53. young. 



V. with feven or eight volutions, tapering to a fine 

 point, the lower one large, the others gradually decreaf- 

 ing: of afemi-pellucid horn-colour, inclining to purplifh- 

 brown towards the top: aperture oblong-oval, half the 

 length of the (hell; outer lip furnifned with two or three 

 tubercles near the margin, and frequently with three or 

 four white denticulations further within the aperture : 

 Columella plicated, with three or four white folds, wliich 

 are much elevated, and appear like teeth, but fpirally 

 turn with the Columella. Length near half an inch ; 

 breadth not a quarter. It is fubjeft to fome variety with 

 refpett to the denticulations on,the outer lip; fome have 

 more, others lefs, or even deftitute of them in young 

 fhells : the plications on the Columella vary alfo from two 

 to four, but moft commonly three. 



If we had not received this fhell from Mr, Boys for 

 Walker's Turbo bidentata, as above quoted ; we fhould 

 hardly have confidered it as the fame ; as he fays it is found 



on 



