BULLA. 439 



It is the B. ampulla of Pennant (not of Linne), B. 

 navicula of Da Costa, B. cornea of Lamarck (who erro- 

 neously referred to it the B. Cranchii of Leach), B. pa- 

 pyracea of Ulysses' Travels {fide Dillwyn), and Haminaa 

 Cuvieri of Leach ; the young appears to be the B. utri- 

 culus of Risso (not of Brocchi), and, according to Scacchi, 

 the B. pisum of Delle Chiaje. 



B. elegans (H. elegans) of Leach is much smaller, ob- 

 long, narrower, and more solid, with the outer lip not 

 projecting beyond the crown. Dr. Leach records it from 

 Tenby, Swansea, and the Devon coast ; but I believe he 

 was misinformed as to at least the first two of these places. 

 I have it in the Turtonian collection. Mr. Lukis and 

 Mr. Macculloch found it at Herm, and I dredged a 

 fragment in Guernsey; so that this species may be 

 looked for on our southern coasts. It is common in 

 the Mediterranean, and is probably the H. folliculus of 

 Menke. 



Another species, equally doubtful as a native of our 

 seas, is B. dilatata of Leach. This differs from B. hy- 

 datis in its much smaller size, depressed shape, micro- 

 scopical and more close-set spiral sculpture, and in its 

 widely expanded mouth, the upper corner of which pro- 

 jects far beyond the crown, in a wing-like fashion. Fal- 

 mouth (Leach); Dublin Bay (coll. Turton); Cork Har- 

 bour (Humphreys); Loire-Inferieure (Cailliaud) ; Ilede 

 Rhe, in the Gulf of Gascony (J. G. J.); Grand Canary 

 (M f Andrew) . B.pemphis of Philippi (from the Red Sea) 

 and B. virescens of Sowerby (from Pitcairn's Island) 

 are allied to the present species. 



