BULL A. DIPPER. 21 



trcmcly thin, often a mere film, the upper part lying close 

 to the body volution, but not attached till it has taken 

 nearly one turn ; pillar visible to the end, the lip a little 

 thickened and white : length about three quarters of an 

 inch ; breadth not half an inch. 



In the plates to the Dorset Catalogue, the figure, which 

 is a very indifferent one, of this shell, is marked 13 : but in 

 the description and the index fig. 12 is referred to. This 

 error has been copied by Mr. Dillwyn. And Maton and 

 Rackett, having first quoted fig. 13, have in their corri- 

 genda directed us to amend it, by altering it to 12. 



On the western coasts, North Britain, and the strand at 

 Balbriggan in Ireland : rare. v. m. 



4. Bulla Ampulla. Bubble Dipper. 



Lister, pi. 713. f. 69, and pi. 1056. f. 8 Montagu, pi. 7- 



Shell oblong-oval, smooth, glossy, opake, whitish mar- 

 bled and veined with light chesnut-brown generally in 

 waves, glossy white within: aperture moderately wide, 

 open all down, contracting towards the crown which is 

 slightly concave at top ; outer-lip thin ; pillar-lip thickened, 

 opake white, not spreading on the body of the shell, nor is 

 the pillar visible all the way down as in B. lignaria : length 

 about three-eighths of an inch ; breadth a quarter of an 

 inch. 



On the western coasts, and North Britain : very rare. 

 v. m. 



b. Bulla patula. Patutous Dipper. Fig. 27,23. 



Pennan' r , pi. 73, two figures under the uppermost Do- 

 novan, pi. 142 Dorset Cat. pi. 12. fig. 8. 



Shell oblong, or rather fusiform, transparent, very mi- 

 nutely striate longitudinally, glossy white or with a pale 

 rosy tinge, involute and open all the way, both the ends 

 lengthened into a canal ; one of which is shorter and trun- 

 cate, a little leaning to the left, with a twist or fold on the 

 pillar, and furnished with a few transverse stria? ; the other 

 end more open and lengthened, with a slight indenture or 

 furrow on the pillar-lip, and obliquely striate ; aperture 

 arched, the outer-lip very thin and plain : length an inch ; 

 breadth nearly half as much. 



On 



