109 



Balea. 



Spiral tapering shells, with many convolutions. 

 Aperture somewhat egg-shaped, and left-handed. It 

 has much the appearance of a Clausilia, but does not 

 possess the clausilium of that family. 



The animal resembles a Bulimus. 



Balea fuagilis [The Fragile Moss Shell]. 

 Drapamaud. 



Figure 79. 

 79. 



This shell is known under various names; it is the 

 Turbo perversus of Turton, the Pupa fragilis of Dra- 

 pamaud, the Clausilia fragilis of Pfeiffer, the Clausilia 

 perrersa of Charpentier, the Odostomia perversa of 

 Fleming, the BalcEa perversa of Grey, the Balea per- 

 versa of Macgilivray, and the Balea fragilis of Sowerby. 



It is small, thin, delicate, shining, somewhat trans- 

 parent, elongated, tapering to a point, striated longitu- 

 dinally, thin peristome, slight umbilicus, mouth pear- 

 shaped, outer lip slightly arcuated. Yellowish horn- 

 coloured. It has from six to nine convolutions. 



The usual length is a third of an inch. Professor 

 Forbes remarks that large specimens attain a length of 

 five lines. I have never found any exceeding four lines. 

 h 



