274 AMASTRA, MOLOKAI. 



species of Molokai or Maui, but other wise related to A. mu- 

 cronata and atroflava. A. nucula Smith differs by its very 

 much more finely striate second embryonic whorl, and less 

 importantly by the more solid texture and malleated surface. 

 Moreover, in the type of nucula, the 'cuticle is preserved ex- 

 cept in front of the aperture, and it shows no color markings 

 of any kind. Named for E. R. Sykes, author of the molluscan 

 part of Fauna Hawaiiensis, and other useful works. 



77. A. NUBIPERA n. sp. PI. 41, figs. 6, 7. 



Shell subperforate or imperforate, ovate-conic, rather thin, 

 scarcely shining. Outlines of the spire straight, First half- 

 whorl smoothish, next whorl rather weakly but coarsely cos- 

 tate, the ribs low, a keel indistinctly showing very close above 

 the suture ; succeeding whorl very finely costulate. Following 

 whorls weakly convex, with fine sculpture of growth- wrinkles. 

 Under the cuticle the shell is pale reddish-brown above the 

 periphery, the first three whorls dark purple-brown; base 

 white. Cuticle thin and smooth, in front pale with olivaceous 

 angular or dislocated stripes, on the back of the last whorl 

 olivaceous with darker longitudinal streaks and some light 

 and dark mottling. Aperture bluish or fleshy-white within 

 lip thin and sharp ; columellar lamella moderate, strongly 

 oblique. Length 12.5, diam. 7.3, aperture 6.1 mm. ; 5% 

 whorls. 



Molokai : Cotypes no. 2048, C. M. Cooke coll. 



This species differs from A. siibobscura by broader contour 

 at all stages of growth, and by the coloration, subobscura 

 having no cuticular maculation. It is a broader, thinner 

 shell than dissimiliceps, which is closely related. The mas- 

 ter si type of ground- color this species shares with A. m. semi- 

 carnea, some forms of A. affinis, and other species. There are 

 two shells in the Cooke collection, one in coll. Boston Society. 



There is also in the Boston collection, no. 13468, a somewhat 

 smaller form, length 12, diam. 6.8 mm., in which the under- 

 color of the last two whorls is white and the apical costa- 

 tion is stronger. This may perhaps prove distinct. 



