304 AMASTRA, MAUI. 



with a white sutural border, the last whorl cream-white. 

 (3) Cream- white throughout, or with only the embryonic 

 whorls reddish-brown. Very little of the thin, olive or olive- 

 brown cuticle is retained above the last whorl. What there 

 is on the penult, whorl and front of the last is marked with 

 angular dark fibres, or mottled with light on a dark ground 

 or net-work. On the latter part of the last whorl it becomes 

 continuous except where worn off. The apex is of the typical 

 cos tat e and earinate form. The last whorl is angular at the 

 periphery, the angle usually rather sharp and distinct in 

 front, but sometimes quite weak. There is a very thin callus 

 within the lip in the oldest shells, but usually it is quite thin. 

 A blackish cuticular edge is present in the type, but not in 

 other examples. 



Length 16.5, diam. 9.7, aperture 7.9 mm. ; 6y 2 whorls 

 (type). 



Length 16.5, diam. 10, aperture 8 mm. 



Length 15, diam. 8.7, aperture 7 mm. 



Length 15, diam. 9.5, aperture 8.2 mm. (not mature). 



It is a larger, more capacious shell than A. affinis (or rus- 

 tica) , further differing by the angulation of the last whorl 

 and the less elaborately figured cuticle. A. montana is a 

 shorter shell with rounded periphery. 



100. A. JOHNSONI Hyatt & Pilsbry, n. sp. PI. 4*5. fig. 16. 



Shell nearly imperforate, oblong-conic, rather thin, some- 

 what glossy. Outlines of spire straight above, a little convex 

 below, the whorls nearly flat. Embryonic whorls costate, the 

 second carinate, about as in A. affinis. Later whorls marked 

 with growth-wrinkles. Color brown, the last whorl partially 

 covered with a thin, darker cuticle having some darker and 

 lighter streaks but no oblique or angular markings. Aper- 

 ture whitish within; lip acute, very little thickened within. 

 Columella straight, reflexed above, bearing a small, strongly 

 oblique lamella. Length 11.3, diam. 6, aperture 5.1 mm. ; 6^2 

 whorls. 



West Maui: Wailuku (Gulick, in coll. Boston Society). 



This shell is narrower than A. affi,nis siibpulla, with a much 



