ioo Original Descriptions of Achatinella. 



DWIGHTII GROUP. 

 156. Achatinella dwightii Newcomb. 



./. dwightii Newc. Ann. Lye. New York, vi, 1X55, p. 145. 



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

 lique longitudinal striae, cut across by very numerous fine, slightly 

 undulating, cross striae ; whorls 6, flatly convex, crenulated 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, more obscure 

 on the last whorl ; aperture and lip of a dingy white. Long. 19/20, 

 lat. 9 1/2/20 poll. 



Remarks. This is also a rare species, offering but few varie- 

 ties, the only variation from the type being the one figured, in 

 which the suture, instead of being simple, is, in the last whorl, 

 strongly corded. — Newc. 



Hab. Kamalo.— Bald. 



A series of over one hundred examples is in the author's col- 

 lection, showing type forms and also darker brown varieties with 

 a white band on the last whorl. This with the following two shells 

 may be grouped together. 



157. Achatinella compta Pease. 



Parliilina compta Pse. J. Conchyl. xvii, 1869, p. 175. 



T. sinistrorsa, anguste perforata, solidiuscula, oblongo-eonica. spira obso- 

 lete transversim tenuiter rugoso-striata (ad anfractum ultimum fugis evan- 

 escentibus) et longitudinaliter striis tenuibus, irregularibus impressa ; spira 

 turrita aut oblongo-eonica; sutnra impressa; anfr. 6, convexi, interdum 

 supra subangulati, ultimus 1-2 longitudinis teste tequans ; apertura verti- 

 calis, ovata ; plica eolumellaris supera, valida, alba ; labro vix expanso, intus 

 calloso ; plumbeo-grisea, lineis vel fasciis rufescenti-fuscis cingulata ; anfr. 

 ultimus ad basin fascia alba ornatus. Long. 25, diam. 13 mill. 



Shell sinistral, narrowly perforate, somewhat solid, oblong- 

 conic, with the spire obsoletely, transversely, thinly wrinkled to 

 striate (the wrinkles disappearing on the last whorl) and longi- 

 tudinally marked with thin, irregular striae; spire twisted or 

 oblong-conic ; suture impressed ; whorls 6, convex, sometimes 

 times sub-angulate above, the last equal to half the length of the 

 shell ; aperture vertical, ovate ; columellar fold high, strong, white; 

 lip hardly expanded, thickened within ; lead colored, encircled by 

 reddish brown lines or bauds, the last whorl with a white band 

 on the base. 



