30 DR Johnston's descriptive catalogue of the 



our species. It may assist the solution of the question to add the 

 specific character which Dello Chiaje gives of A. fasciata, " tnbtilo 

 in dorso, brevissimo ; branchiis paullum longis, intcgris ; alts amplissimiSf 

 liberis ; si/phonc laterali, ea:tenso," — Anim. senza Vert. Napol. i. 69, 



23. Bulla. Linrueus. 



Animal gasteropod, destitute of tentacula ; '* body in front with a 

 fleshy expansion or tentacular disc, behind with a membranaceous ap- 

 pendage or lid. Shell convoluted ; aperture the whole length of the 

 shell. ' ' — Fleming. 



1. B. Cranchiiy shell oblong-oval, opaque, white, marked with nume- 

 rous close transverse punctured stria). Flem. Br. Anim. 292. 

 B. cornea, Lamarck^ Anim. s. Vert. vi. ii. 36. B. punctura, 

 Johnston in Edin. New Phil. Journ. April 1828, p. 79. 



Hab. Berwick Bay, very rare. 



Shell 4 lines long, thickish ; apex with a very narrow perforation. It re- 

 sembles the B. ampulla of Montagu in shape ; but is distinguished by 

 having the whole surface punctured, and those punctures are arranged 

 in regular strine. Only one specimen has occurred, and a part of the 

 outer lip appears to have been broken off during the animal's life, and 

 again renewed ; this portion is smooth. This description differs in 

 some material points from that of JB. Cranchil, given by Lamarck 

 and Fleming ; but I have the high authority of J. E. Gray, Esq., to 

 whom my specimen was presented, for stating that it and my B. punc- 

 tura are the same shell. The specific name commemorates a very re- 

 markable man, and enthusiastic naturalist, of whom there is an inte- 

 resting life in tlie Annals of Philosophy, vol. xi. p. 32G. 



2. B. umbilicatay shell cylindraceous, rounded at both ends, smooth, 

 white, pellucid ; spire none ; aperture linear and narrow above, 

 widening below, entire ; the pillar with an oblique obsolete plait ; 

 the outer lip thm and rounded. Length Jth ; breadth less than 

 the half. Mont. Test. Brit. 222, pi. 7, fig. 4. Flem. Brit. 

 Anim. 293. 



Hab. Berwick Bay, in sand, very rare. 



From its pellucidity, the pillar is visible within the shell. There is no 

 spire, nor is the apex umbilicate. 



3. B. cylindracea, shell cylindrical, white or greyish, smooth; aper- 

 ture linear, widened at the base ; apex umbilicate ; pillar with a 

 single fold. Length 5 lines ; breadth not 2. Pen. Brit. Zool. 

 iv. 259, tab. 73, lower fig. Mont. Test. Brit. 221, tab. 7, fig. 2. 

 Flem. Br. Anim. 293. 



Hab. Berwick Bay, rare. 



