BALEA. 
175 
some specimens than in others, which peculiarity 
denotes the growth of dentate shells, sufficiently re- 
futes the idea of its being the young of K pusilla. 
Mr. Alder observes that the difference between 
this species and V, pusilla appears to be more in the 
number of the teeth than in the colour of the shell ; 
and if the former is permanent, it is undoubtedly 
the better character of the two. He further re- 
marks, I have some doubt about this species : I 
examined Mr. Jeffreys’ specimen, but could not 
satisfy myself of its distinctness from V. pusilla : I 
take it upon faith.” 
After considerable inquiries and correspondence, 
I have not been able to procure a specimen of this 
species, to examine or figure ; and thence I cannot 
offer any opinion on the subject of its distinctness. 
Captain Brown has added to the list Pupa labiata 
Brown, B. S. t. 41. f. 7.; but the figures are so in- 
distinct that I cannot determine them. 
12. Balea. (Moss Shell.) 
The animal is like Bulimus\ but the shell is reversed, 
thin, with an elongated taper spire, the last volu- 
tion larger than the next; aperture roundish- 
oval, entire at the base, oblique, with a single 
tooth on the pillar, which is wanting in the 
young shells, and the pillar is destitute of any 
valve-like plait or clausium ; jaw lunate, narrow, 
scarcely crenulated. 
This shell is often mistaken for a young unformed 
specimen of Clausilia; but it may be known from 
