BULLA. DIPPER. 21 
tremely 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. tn. 
t 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 
wares, 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 risible all the way down as in B. lignarla i length 
about three-eighths of an inch; breadth a quarter of an 
inch. 
On the western coasts, and North Britain: very rare, 
r. in, 
5. Bulla patula. Patulous Dipper. Fig. 27,23. 
Pennan*, 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 strim; 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 ail inch $ 
breadth nearly half as much. 
On 
