87 



XIIT. BALNEA. 



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 Bulimus 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 

 Pertigo, in the regularity of its peritreme. 



70. EALJEA fragilis. Shell rather linear-oval, trans- 

 parent, yellowish. 



Balaea fragilis. Leach, Mollusc, p. 116. 

 Balea fragilis. Grey, ZooL Journ. i. p. 61. 

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

 Turbo perversus. Mont. p. 335. t. II. f. 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- 



