ACHATINA.— Plate I. 



RoissY, Buffon de Sonnini, Hist. Moll. p. 354. 



Bulla acliathia, Linnseus. 



Buecinum achatinum, Muller. 



Buccinum varier/atmn, Fabius Columna. 



Bulimus achatimis, Bruguiere. 



CochUtoma acliathia, Perussac. 



Achatina perdix, Lamarck. 

 Hub. Sierra Leone &c., West Africa (in the woods). 



This fine large species exists in great abundance in the 

 woods of West iyiica, with little variation except that the 

 striped painting is sometimes absent, as in PL V. 



Species 4. (Mus. Cuming.) 



Achatina bicolor. Achat, testa subelongato-turritd, 

 anfractibm septem, siibirregulariter striatis, ad suturas 

 indistincte plicato-crenidatis, columella arcuatd et con- 

 tortd, fortiter truncatd, aperturd parvd ; intense pur- 

 pureo-nigrd, apicem versus castaned, columelld ccBrules- 

 eente-albd. 



The two-coloueed Achatina. Shell somewhat elon- 

 gately turreted, whorls seven in number, rather 

 irregularly striated, indistinctly plicately creuidated 

 at the sutures, columella arched and twisted, strongly 

 truncated, aperture small; intense purple-black, 

 chesnut towards the apes, columella bluish-white. 



Jay, Cat. Mus. p. 119. 



AcJiatineUa bicolor, PfeifFer. 



Acliathia adtista, Gould (fide Pfeifl'er). 

 Hab. Sandwich Islands. 



This shell has not the generic character of AchatineUa, 

 the species of which are more or less polished, and dis- 

 tinguished by a peculiar screw-like twist of the columella. 



Species 5. (Mus. Cuming.) 



Achatina cochlea. Achat, testd elongato-turritd, an- 

 fractibus octo, spiraliter costatis, superne depressis, 

 infra convexo-planis, bad subangulatis, columelld pro- 

 fundi arcuatd et contortd ; nstulato-castaned, zonula 

 albd utfra suturas. 



The sceew Achatina. Shell elongately turreted, 

 whorls eight in number, spirally ribbed, depressed 

 round the upper part, convexly flattened beneath, 

 slightly angled at the base, columella deeply arched 

 and twisted ; burnt chesnut colour, with a narrow 

 white zone beneath the sutures. 



Hab. Peru. 



This species is chiefly remarkable on account of its 



elongated form and spiral ribbed structure, having much 



the aspect of a Turritella. 



