ACHATINELLA Pica, 



The Bead Snails. 



Class Mollusca. Order Phytophages. Lam. Sw. Genus — ? 



Sub-Generic Character. 



Shell oblong-conic, spiral, Columella with the base thickened and 

 truncate , inner lip none ; outer lip internally thickened ; aper- 

 ture without teeth. Nob 



Type Monodonta scminigra Lam. 



Specific Charactkr. 



Shell trochiform, black; apex and base of the pillar white. 



Monodonta semi-nigra Lam. 



Achatina pica. Swains. Monog. in Brands Journal, April, 1828, 



p. 84. 



Achatinella is a very peculiar group of land shells, found 

 only in the Pacific Islands. They are all small, and so re- 

 markably beautiful, that the natives use them for ornaments. 

 It was under this form that seven different species came 

 into our possession on the return of Captain, now Lord 

 Byron, from his voyage to the South Seas. As the systematic 

 conchologist will find them fully described in the Journal 

 above quoted, Ave now only illustrate them by figures. 



ACHATINELLA perversa, fig. 2. 



Specific Character. 



Shell reversed, sub-trochiform, fulvous brown with darker trans- 

 verse bands and longitudinal lines ; apex and suture while. 



Achatinella perversa. Swains. Monog. No. 2, p. 84. 



Our figures of this elegant species are somewhat larger 

 than nature. 



ACHATINELLA Acuta, Fig. 3. 



Specific Character. 



Shell ovate-oblong, chesnut, with a marginal fulvous band; spire 

 somciohat lengthened, acute, the lip black. 



Achatinella acuta Sw. Monog. No. 3, p. 84. 



Shell somewhat pyriform, the spire being pointed, and 

 considerably longer than the aperture : In these respects it 

 differs considerably from the two preceding, but the great 

 peculiarity of the twisted and truncated columella or pillar, 

 sufficiently points it out as belonging to this group. 



99. 



