22 BULLA. DIPPER. 



On the South Devon coasts, and North Britain : very 

 rare. v. v. 



Cy. Bulla diapliana. 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 denned : aper- 

 ture dilated, somewhat oval, extending to the termination 

 of the body volution ; outer-lip extremely thin and plain ; 

 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 Cyprasa europsea 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 ; its 

 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. m. 



7- Bulla cylindracea. Cylindrical Dipper. 



Lister, pi. 7H...f. 70, two middle figures Pennant, 

 pi. 73, two lowest figures Montagu, pi. 7. f- 2 -Donovan, 

 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 five 

 lines ; breadth not two. 



On the western coasts, Scotland, and Dublin bay* v. v 



8. Bulla umbilicata. Indented Dipper. 

 Montagu, pi. 7- fig- 4. 



{Shell oblong, smooth, white, rounded and concave at the 



crown. 



