Bulla. 
MOLLUSCA. BRANCHIFERA. 
S9S 
Length -j^ths, breadth fVtlis of an inch ; translucent, horn-coloured ; striae 
in bands, slightly waved by indistinct lines of growth ; the pillar-lip is a little 
reflected, forming a pillar cavity, and is slightly waved where it joins the 
outer lip ; the latter projects very little ; the apex is concave, without visi- 
ble whorls. The specimen from which the preceding description was taken 
was sent me, under the above title, several years ago, hy my friend Dr Leach. 
The detailed description of its characters may be expected in his long wished- 
for work on the British Molluscous Animals. 
174. B. ampulla, — Shell oblong, ovate, smooth, mottled with 
brown. 
Mont Test. Brit. ccvi. t. vii. f. 1, — In Falmouth Harbour, Montagu; Dun- 
bar, Laskey. 
Length |ths of an inch ; opake ; aperture moderately wide ; on the lower 
end of the pillar-lip the shell is thickened, of an opake colour, but the dupli- 
cature does not spread up the body of the shell. Montagu was probably mis- 
taken in referring his species to the Ampulla of Linnaeus, with which it does 
not agree in shape or form of the aperture. 
175. B. umhilicata. — Shell oblong-oval, smooth ; aperture 
narrow, a little dilated anteally. 
Mont. Test. Brit, ccxxii. t. vii. f. 4. Turton, Conch. Diet. 22. — Coast of 
England and Ireland. 
Length |th of an inch ; breadth Jgth ; of a white colour ; apex rounded in- 
to a cavity. 
176. B. cylindracea. — Shell lengthened cylindrical ; aperture 
narrow ; pillar-lip with an indistinct fold. 
C« V. exigua alba vere cylindracea, List. Conch, t. Dccxiv. f. 70 B. cyl. 
Penn. Brit. Zool. iv. 117- t. lix. f. 85. Bon. Br. Sh. t. 120. Mmt. 
Test. Brit. xxi. t. vii. f. 2. — In sandy bays, common. 
Length |ths of an inch ; smooth, glossy white ; outer lip thin, straight ; 
pillar-hp thickened with an oblique fold ; apex truncated, depressed Per- 
haps this species should be transferred to the genus Volvaria of Lamarck, as 
he has hinted. 
177. B. truncata. — Shell subcylindrical, truncated, and deep- 
ly marked with the lines of growth retrally, rounded and smooth 
anteally. 
B. crassa. Walk. Test. Min. xvii. t. iii. f. 62 — B. tr. Adatns, Linn. Trans, 
vol. V. 1. 1. i. f. 12. Mont. Test. Brit. 223. t. vii. f. 5 Not uncommon. 
Length about the eighth of an inch, white, closely pellucid ; aperture nar- 
row, opposite the body, suddenly widening at the pillar, exhibiting the in- 
ternal volutions ; apex with a cavity. 
178. B. Musa ^ — Shell subcylindrical ; apex exhibiting a pro- 
jecting obtuse spire of three or four whorls. 
Voluta alba opaca longitudinaliter striata. Walk. Test. Min. I 7 . t. iii. f. 
61. — B. ob. Mont. Test. Brit. 223. t. vii. f. 3, common. 
Length |ths, breadth |th of an inch, with a brownish epidermis ; lines of 
growth distinct ; aperture narrow retraUy, widening at the pillar ; outer lip 
slightly incurved in the middle. 
