22 BULLA. DIPPER. 
On the South Devon coasts, and North Britain:very 
rare, v . v . 
(). Bulla diaphana. Transparent Dipper. 
Pennant , pi. 74. f. 2— Montagu , pi. 7- f. 8. 
Shell oval, extremely thin and fragile, smooth, transpa- 
rent, glossy white: spires three, very little produced and 
ending rather obtusely, the first occupying three-fourths of 
the shell, the others rather rounded and well defined: aper¬ 
ture dilated, somewhat oval, extpnding to the termination • 
of the body volution ; outer-lip extremely thin and plain; 1 
pillar-lip smooth and not reflected: length-four tenths of 
an inch ; breadth hardly three tenths. 
Having carefully examined a specimen of this very rare 
shell, from the cabinet of Mrs.C.W.Loscombe,of Exmouth, 
and compared it with the Cypraea europaea in its various 
stages of growth, we are strongly and decidedly of opinion 
that it is distinctly a Bulla, much resembling in its outline 
some of the short-spired fresh-water species of this family. 
Independently of the animal inhabitant being of a totally 
different construction, as was observed by-Montagu; h 
general dissimilarity, comparative size, extreme tenuity, 
and the total absence of the least appearance of incipient 
ribs or teeth, induce us to strengthen this opinion. 
Salcomb bay, Falmouth, and Exmouth, v. in. 
* 7- Bulla cylindracea. Cylindrical Dipper. 
Lister , pi. 714. f. 70, two middle figures— Peprmi, | 
pi. 73, two lowest figures — Montagu , pi. 7- f- 2— Donomt, \ 
pi. 120. f. 2—Dorset Cat. pi. 18. f.22. 
Shell cylindrical, slender, of nearly equal' diameter at 
both ends, smooth, glossy white : aperture very ^narrow, a 
little dilated at one end, reaching the whole length; the 
crown without external volution, but impressed with a deep 
cavity; outer-lip thin, sharp, straight; inner-lip thickened, 
opake, white, the pillar a little indented : length about fire 
lines ; breadth not two. 
On the western coasts, Scotland, and Dublin bay. r.c. 
8 . Bulla umbilicata. Indented Dipper. 
Montagu , pi. 7- fig* 4. 
Shell oblong, smooth, white, rounded and concave at the 
crown, 
