S7 



XIIT. BALiEA. 



Shell reversed, thin, with an elongated taper spire, the 

 last volution larger than the next: aperture round- 

 ish-oval, entire at the base, oblique, with or without 

 a single tooth on the pillar : operculum none. 



From the Bidimus and the Pupa this genus is distin- 

 guished by the aperture being left-handed ; from 

 the Clausilia, in having the ultimate volution pro- 

 portionately larger than the next; and from the 

 Vertigo, in the regularity of its peritreme. 



70. BALMAfragilis, Shell rather linear-oval, trans- 

 parent, yellowish. 



Balaea fragilis. Leach, Mollusc, p. 116. 

 Balea fragilis. Gre?/, Zool. Journ. i. p>. 61. 

 Pupa fragilis. Drap.p. 68. t. 4./. 4. 

 Turbo perversus. Mont. p. o35. t. 11./. 12. 



Shell about a quarter of an inch long, slender and 

 tapering to a rather sharp point, transparent, yel- 

 lowish horn-colour, slightly striate longitudinally : 

 spire consisting of from six to nine raised and well- 



