Descriptions of New Species of Achatinella. 145 



Habitat. Kanai. 



Shell dextral, conically ovate ; apex acute ; whorls 6, plano- 

 convex ; suture above but lightly impressed ; below, strongly 

 marked ; lip simple ; columella short, with a twisted plait ; 

 epidermis light brown, often encircled by narrow white bands. 



This shell has been looked upon by some of my European 

 correspondents as a small variety of A. cylindrica Nob., from 

 which it is widely separated in locality, coming from a distinct 

 conchological province, varying in the animal, and quite dis- 

 tinct in the shell. In the cylindrica the bands are impressed 

 into the substance of the shell, in this species they are laid upon 

 the epidermis. 



In the first-named, the adult is more than double the size of 

 the present species as usually found. 



6. Achatinella Dwightii. 



A. testa oblonga conica, sinistrorsa, solida, striis oblique longitudinali- 

 bus, lineis transversis exiguis, subundulatis numerosissimis intersectis 

 obtecta, ; anfr. 6, plane convexis ; sutura siraplici, impressa ; apertura 

 ovata ; columella lata, brevi, et leviter plicata ; labro exteriori expanso, 

 infra sub-reflexo ; sub-umbilicata, ; colore cinereo-albo maculis et sio-nis 

 zigzag fuscis, in anfracto ultimo evanidis ; apertura et labro sub-albis. 



Long. \% ; lat. || poll. 



Habitat Molokai. 



Shell oblong conical, sinistral, solid; surface covered with, 

 oblique longitudinal striae, cut across by very numerous fine, 

 slightly undulating, cross strios ; whorls 6, flatly convex, crenu- 

 lated at the sutures ; suture simple, well marked ; aperture 

 ovate ; columella broad, short, and slightly twisted ; outer lip 

 expanded, sub-reflected below ; sub-umbilicated ; color a greyish 

 white, with numerous blotches, and zigzag markings of brown, 



