U9 
BUL1MUS costellatus. 
TAB. CCCLXVL 
Spec. Char. Ovate, rather acute, longitudinally 
costated ; costae small, numerous ; aperture 
elongated, acute above. 
About an inch and a quarter long, and rather more 
than an inch wide ; the aperture occupies half the length 
of the shell. The ribs are very thin and numerous, rather 
sharp, and nearly straight ; there are no striae between 
them. 
A considerable resemblance may be observed between 
this shell and Bulimus ellipticus (tab. 337.) but they 
differ in general form ; the aperture and last whorl are 
proportionally much larger in B. costellatus, than in B ellip- 
ticus, and it is also a right handed shell, which the latter 
never appears to be. I am indebted to J. Holloways, Esq. 
for the use of what appears to be a unique specimen, 
from the freshwater formation of the Isle of Wight. 
It was found along with B. ellipticus, in a pit on the 
North of the road at Schalcomb, where I have in vain 
sought for another. It is possible that if a perfect 
specimen were examined, some characters might be dis- 
covered that would remove it from the genus Bulimus, 
and also from among the land shells. 
