ACHAT INI A perversa. 

 Reverse Achatina. 



Generic Character. — See PI. 3o. 



SrEcinc Character. 



A. (Div. 2.) testa apertura perversa : spira producta, 7-volutd, apue Lruiiceto ; 

 albida strigis nehulosis cinereis ; linea transversa in basali anjractu ; co- 

 lumna vmrgine lahii exterioris custnneis, apertura intus alba. 



Aperture reversed : spire lengthened, of seven volutions, the apex trun- 

 cated, whiteibh with clouded cinereous stripes; central band on the 

 basal volution, pillar, and margin of the outer lip chesnut ; mouth 

 within white. 



XVEVERSE shells, or such whose mouth when viewed in front 

 is on the left side, are generally held in much estimation by col- 

 lectors. This deviation from the usual form of shells is some- 

 times accidental, as in our common garden Snail and several 

 others ; w^hile in some species it appears a constant, and there- 

 fore a specific distinction. Such I apprehend is the case with 

 the shell now figured, a rare and very elegant species, apparently 

 not noticed by any writer ,• two or three existing in the British 

 Museum and one in my fallier's cabinet are all the specimens I 

 have hitherto seen. The latter (here figured) came from Bahia in 

 South America. The whole shell is very finely marked with 

 longitudinal strije, and the colouring better seen than described: 

 the buff tinge at the base is occasioned by the remaining epider- 

 mis. 



This shell belongs to the second division of the genus Achatina 

 as mentioned at Plate 30, having the aperture much shorter than 

 the spire and the base nearly entire. Bulla virginea of Linn, 

 seems to connect the two divisions, having the lengthened spire 

 of one and the truncated base of the other. 

 PI. 36. 



