254 BULLA. DIPPER. Class Vt 



GENUS XXI. BULLA. DIPPER. 



Aximal, of some species, a Slug. 

 Shell sub-oval. 



Aperture oblong, smooth; one end a little 

 convoluted. 



1, lignaria, Lin. Syst. 1184. Cm. Lin. Lin. Tr. viii. 125. ib. ii. 15. 



zcood. 3425. Mont. Test. Br. 205. 



List. Conch, tab. 714. Jig. 71. 



B. of an oval form, and striated transversely. 

 Is narrower towards one end, which is a little 

 umbilicated. Of a dirty color, like some woods, 

 whence the trivial name. The inside of the 

 shell visible to the very end, through the colu- 

 mella. Length about two inches. Tab. Ixxiii. 



2. ampulla. Lin - Sl J st ' 1183 - No - 378 - Mont. Test. Br. 206. t. 7- ■ 



obtuse. Cm. Lin. 3424. /. 1. 



Lin. Tr. viii. 124. 



B. with a brittle shell, more obtuse at the end ; 

 and the inner side lapping over the columella, so 

 as to render it invisible. 

 Found near Weymouth. 



