32 BOOK OF SPECIES. 
aperture ovate, pyriform, with two laminar folds, 
one of them straight, placed near the top of the 
aperture, and nearly central, the other curved, 
and in the middle of the pillar-lip; operculum 
emarginate. §. B. T. 53. 
C. veNnTRIcosA. Ventricose, opaque, grey 
brown, with regular raised strize; aperture with 
two plaits; margin white, and detached all round; 
lateral margin narrowing the mouth. #. B. T. 
59. Differs from C. rugosa by the flatness of its 
eleven whorls. 
BULIMUS. TERRESTRIAL. 
Ovate, oblong or turreted ; aperture entire, longi- 
tudinal ; margins unequal, and disunited above; 
columella straight, smooth, entire at the base, 
and not effuse. 
B. ovatus. Sub-umbilicated, ovate, ventri- 
cose, longitudinally wrinkled, with the summit 
and outer lip rose-colour; pillar white; the 
shell tawny white, covered with a yellow epi- 
dermis; outer lip reflected, and thick. 43. W. 
34, 101. 
B. HaMASTOMUS. Ovate-oblong, ventricose, 
sub-umbilicated, longitudinally striated, tawny 
white; lip and columella rose-colour. Smaller 
than the preceding. W. 34. 102. 
B. unpAtus. Ovate, subconic, thin, smooth, 
