89 



BULIMUS costellatus. 



TAB. CCCLXVI. 



Spec. Char. Ovate, rather acute, longitudinally 

 costated ; costi© 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 Buliraus 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 Wiffht. 

 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. 



