92 AURICULELLA, OAHU. 



the periphery of the last whorl ; and dark chestnut with a 

 white band on the last whorl . The shells from Kaaawa are a 

 very pale tint of yellow, shading to cinnamon on the spire and 

 sometimes near the lip. 



Group of A. castanea. 



The shell is at least twice as long as wide, usually imper- 

 forate, sometimes perforate ; thin, sometimes slightly solid. 

 Spire turrited or elongately conic. Lip thin or only very 

 slightly thickened, but little expanded. Columella twisted, 

 biplicate in the young, and usually in the adult stage, with 

 the outer margin adnate or free. 



In the young the shell is imperforate, carinate or angled at 

 the periphery ; the columellar lamella, developed on the lower 

 part of the fold, is strongly developed, the fold itself less so, 

 and more oblique. 



One species, A. tenella, is found in the Waianae mountains, 

 the others all in the main range. 



13. A. TURRITELLA Cooke, ii. sp. PL 25, fig. 15. 



The shell is imperforate, dextral, turrited, elongate, chest- 

 nut, rather thin, semidiaphanous, not glossy, under a lens 

 minutely and regularly striate with lines of growth. Spire 

 elongately conic, apex somewhat obtuse. Suture scarcely im- 

 pressed, marginate, dark chestnut. Whorls Q 1 /^, the embryonic 

 rounded, the rest flat, slowly and regularly increasing, com- 

 pact, the last somewhat rotund, subsaccate at the base. 

 Aperture ovate, hardly oblique. Parietal lamella scarcely ob- 

 lique, rather small, whitish. Palatal fold minute, transpar- 

 ent, elongate, deeply situated nearly midway between the 

 columella and the periphery. Columella twisted, thickly cal- 

 lous, strongly biplicate, the upper lamella oblique, the lower 

 slightly more developed, more horizontal, both extending to 

 the margin of the lip. Lip rather thin, expanded, the outer 

 margin slightly arcuate, the columellar margin reflexed, ad- 

 nate. The margins are united by a very thin transparent, 

 very minutely punctate callus. Length 8.6, diam. 3.6 mm. 



The young of this species is decidedly angulate at the per- 



