ACHATINA.— Plate XXI. 



Species 95. (Mus. Cuming.) 



ACH.4TINA ISABELLINA. Achat, testd funformi-oblongd, 

 anfractilus sex, comexis, sub lente minutismne decus- 

 satim striatis, ad suturas marginati-s, columella ob- 

 liqud, sublate truncatd, aperturd ovatd ; pellucido- 

 corned, sordide albicante. 



The soiled Achatina. Shell fusiformly oblong, whorls 

 six in number, convex, very minutely decussately 

 striated beneath the lens, margined at the sutures, 

 columella oblique, rather broadly truncated, aperture 

 ovate ; transparent horny, dull whitish. 



PrEiFFER, Pro. Zool. Soc. 1840, p. 31. 



Hab. Mexico. 



K shell of rather fii'm growth, though of transparent 



substance. 



Species 102. (Mus. Benson.) 



Achatina Perrotxeti. Achat, testd pyramidali-conicd, 



anfractibus octo, rotundatis, lavibus, columella subpro- 



futtde arcuatd, aperturd parvd ; fusco-corned. 



Perrottet's Achatina. Shell pyramidally conical, 



whorls eight in number, rounded, smooth, columella 



rather deeply arched, aperture small ; brownish 



horny. 

 Pfeiffer, Revue Zool. Cuv., 18-12, p. 305. 

 Hah. Ndgherries, Hindoostan ; Jerdon. 



Very closely allied to A. cra-mlabrk, from which it 

 mainly differs in being of a rather more elongated form, 

 and not impressly crenulated. 



Species 113. (Mus. Benson.) 



Achatina Oreas. Achat, testd oblongo-conkd, anfrac- 

 tibus septem, convexis, ad suturas subtiliter marginatis, 

 longitudinaliter obscure impresso-striatis, columella 

 arcuatd, aperturd parvd ; fusco-corned. 



The modntain-nymph Achatina. Shell oblong-conieal, 

 whorls seven in number, convex, finely margined at 

 the sutures, longitudinally obscm'ely impressly stria- 

 ted, columella arched, aperture small; brown horny. 



Benson, MS. 



Hob. Nilgherries, Hindoostan ; Jerdon. 



Another interesting species of the Nilgherry type, ap- 

 proaching to the form of A. Jerdoni. 



