350 ACHATINELLA MUSTELINA. 



twisted; peristome lipped within, the right margin unex- 

 panded, columellar margin somewhat dilated, adnate. Length 

 19%, diam. 10%; aperture 8 mm. long, 4% wide. Inhabits 

 the Sandwich Islands, Frick, Mus. Cuming" (Pfr.). 



This form is considered by Dr. Cooke to be an absolute 

 synonym of A. sordida Newc., from which it differs in being 

 dextral and imperf orate. Dr. Newcomb thought it an "elon- 

 gated variety" of A. pulcherrima. From this arose Pfeiffer's 

 "Achatinella pulcherrima var. elongata Newc." (Mono- 

 graphia, vi, 172, 1868). Mr. Sykes considers A. concavospira 

 Pfr. to be identical with napus (Fauna Hawaiiensis, p. 303). 

 The weak convexity of the penultimate whorl and the straight 

 outlines of the spire are common characters of sordida and 

 napus. Moreover, one of Gulick's lots contains both dextral 

 and sinistral specimens, otherwise similar (pi. 62, figs. 5-8), 

 which seem to demonstrate the identity of the two supposed 

 species. PL 62, figs. 9, 10, 11 were drawn from specimens of 

 sordida received from Dr. Newcomb. 



40&. A. MUSTELINA LYMANIANA Baldwin. PL 61, figs. 8-9&, 11. 



"Shell sinistral, very minutely perforated, solid, ovate; 

 spire convexly conical, apex subacute; surface shining, cov- 

 ered with fine incremental lines, under a strong lens showing 

 minute decussating stride; apical whorls smooth, when not 

 eroded. Color dark purplish brown, sometimes with longitu- 

 dinal or transverse white flecks or zigzag lines; a white line 

 traversing the suture; apex light chestnut. "Whorls 6, very 

 lightly margined above, somewhat convex; suture moderately 

 impressed. Aperture oblique, white within, sublimate ; peri- 

 stome acute, thickened within, expanded, the columellar mar- 

 gin slightly reflexed and covering the small perforation, color 

 white on both face and the reverse; columella white, termin- 

 ating in a slightly developed flexuous fold. Length 20%, 

 diam. 11% mm." (Baldwin). 



Oahu: near the southern end of the Waianae range, from 

 around Green Peak (Palikea), three or four miles along the 

 ridge southward, only at high elevations. 



