ACHATINA. 



Species 16. (Mus. Cumiiig.) 



AcHATlNA ALLISA. Achat, testd elongato-ohlo)i(/d, subcy- 

 lindraced, anfractihua septem, oblique subtiUter gra- 

 nato-driatis, infra suturas tenue crenidatis, aperturd 

 parvimculd; columelld arcuatd, subcontortd, abrupte 

 frnncatd; oUvaceo-lutescente, maculis rufo-castamis 

 obloiigis Jiic illic irregulariter inquinatd. 



The bruised Achatina. Shell elongately oblong, some- 

 what cylindrical, whorls seven in number, obliquely 

 finely granosely striated, finely crenulated beneath 

 the sutures, aperture rather smaO ; columella arched, 

 slightly twisted, abruptly truncated; olive-yellow, 

 here and there iiTcgularly bedaubed with reddish 

 chesnut blotches. 



Hah. Cape Palmas, West Atrica. 



This species may be readily distinguished from any of 

 those hitherto described, by its oblong cylindrical fonn and 

 pecidiar style of irregular blotching. The apertm-e is pro- 

 portionably smaller and narrower than in the allied species. 



Species 17. (Mus. Ciuning.) 

 AcHATlNA bicaeinata. Achat . testd obloiigo-ovatd. 



siiisculd, anfractibm sex ad septem, conceutrice plicato- 

 striatis, ultimo inferne obscure bicarinato ; colmnelld 

 snbarcuatd, fortiter triuicatd ; intemi purpured, apice 

 albicante, fusco obscure fiilgiirntd, aperturte fauce c(p- 

 ruhscente-alhd. 



The two-keeled Achatina. Shell oblong-ovate, rather 

 thick, whorls six to seven in number, concentrieaDy 

 phcately striated, last whorl obscurely two-keeled 

 towards the lower part, colimieUa arched, strongly 

 truncated ; deep purple, wliitish towards the apex, 

 marked with obscure brown waves, interior of the 

 aperture bluish-white. 



Lamaeck, Anim. sans vert. (Deshayes' edit.) vol. viii. 

 p. 296. 



Bulla bicarinata, Dillwyn. 

 Bulimns bicariiiatus, Bmguiere. 

 Cochlltoma bicarhmta, Perussac. 

 Tiulla achatina sinistrorsa maxima, Chemnitz. 

 Achatina sinistrorsa, PfeifFer. 



Hab. Prince's Islands, West Afi-ica. 



The keeled growth of this shell is very obscure and not 



always perceptible. The name sinistrorsa was not given to 



the species by Chemnitz as a technical specific appellation ; 



it merely formed part of his diagnose. 



Febraarv, 1S49. 



