BULLA. DIPPER. 27 



Shell oblong, taper, transparent, glossy, smooth, horn- 

 color, with five or six reversed pointed volutions, the first 

 half as long as the shell '. aperture narrow-oval, spreading 

 a little at the base; outer-lip very thin; inner-lip a little 

 thickened and slightly indented. It differs from B. fonti- 

 nalis, in being more taper and produced, in having the 

 aperture more narrow and contracted, and in its darker 

 color : length half an inch ; breadth not a quarter. 



Stagnant waters, and slow, streams, v. v. 



21. Bulia fluviatilis. Rivulet Dipper. 



Helix Bulhcoides. Donovan, pi. 168. f. 2. 



Shell oval, smooth, glossy, brittle, horn-color, with two 

 reversed volutions which are hardly raised or extending 

 beyond the body of the shell : aperture oval-oblong, nearly 

 as long as the body volution : length a quarter of an inch ; 

 breadth three tenths. 



Two specimens of this rare shell were found, by Captain 

 Brown, in a stream near Clonoony Barracks, hi Ireland, by 

 which we are enabled to clear up the doubts which have as 

 yet existed respecting this very obscure species. In. every 

 respect they corresponded with the shell iigi .<.>' hy Dono- 

 van. They were undoubtedly full grown, and oth in the 

 'number of volutions, and other specific mark.s, materially 

 differed from B. fontinalis. And we cannot but concur with 

 this respectable conchologist, that it has no more reason 

 to be placed among the Helices, than Bulla fontinalis, 

 Hypnorum, orrivalis. v. m. 



- 22. Bulla emarginata. 



Linn. Trans, v. pi. 1. f. 9, 10, 11. 



Shell gibbous, transparent, smooth, with the aperture 

 notched, and the. lip slightly arched. 



On the Pembrokeshire coast : minute. 



23. Bulla denticulata. 

 Linn. Trans, v. pi. 1. f. 3, 4, 5. 



Shell oblong, smooth, white, transparent, obtuse, nearly 

 equal : aperture with a very sharp tooth at the top. 

 On the Pembrokeshire coast : minute. 



CARDIUM. 



