AURICULELLA, OAHU. 77 



bands; (d) corneous with narrow dark brown band; (e) dark 

 reddish brown with a narrow or broad yellowish corneous 

 band. It never has the opaque texture of A. auricula. 



la. A. diaphana cacuminis P. & C., n. subsp. PL 24, figs. 11, 

 12. 



Very much larger than A. diaphana, but similar to that in 

 its thin texture; exquisitely glossy, ochraceous-tawny with a 

 chestnut peripheral band (sometimes wanting), but also vary- 

 ing to uniform chestnut-brown or to colonial-buff. Aperture 

 some tint of vinaceous within, the thin edge of the well-ex- 

 panded lip being pale. Length 9.6, oblique diameter 5 mm. ; 

 61/2 whorls. 



Oahu: " Mauna Kope," at the head of the Kalihi-Moana- 

 lua ridge (Thaanum). 



This case falls in with many others noted in our volume on 

 Achatinettid&, where eastern species extend their range west 

 of Nuuanu valley, in noticeably modified races, upon the peaks 

 of the mountain axis. The efficiency of Nuuanu as a barrier 

 to the spread of the mountain tree-snails was much less in 

 former times. 



2. A. STBAMINEA Cooke, n. sp. PL 24, fig. 13. 



The shell is perforate and rimate, dextral, elongately conic, 

 pale chalcedony yellow, fading towards the apex, and more 

 opaque, almost straw yellow near the lip ; thin, imperfectly 

 diaphanous, glossy, under a lens very minutely striate with 

 lines of growth. Spire long conic, apex obtuse. Suture 

 scarcely impressed, faintly margined. Whorls 6*4, nearly 

 flat, the last rather narrow, elongate, ascending slightly to 

 the aperture, somewhat tapering towards the very convex 

 base. Aperture irregularly ovate, slightly oblique and diag- 

 onal. Parietal lamella rather small, slightly oblique. Colu- 

 mella simple, with a small, nearly horizontal lamella. Lip 

 expanded, slightly thickened within, the outer margin con- 

 vex, the columellar margin reflexed; parietal callous thin, 

 with a short thickening near the posterior angle. Umbilical 

 groove rather long. Length 7.6, oblique diam. 3.7 mm. 



Oahu: Mt. Tantalus (Cooke). 



