19'5 AMASTRA, OAHU. 



This species differs from A. tristis only by its narrower 

 shape at all stages of growth. The apical whorls are worn, 

 rather narrowly conic, and seem to resemble those of A. tristis. 

 A specimen from Wainiano, coll. Spalding, agrees with fig. 9 

 in the nearly continuous coal-black cuticle, but where re- 

 moved in front of the aperture the under layer is a fine light 

 orange-brown color. A. seminigra occurs on the same slope 

 of the range northwestward of the area of A. tristis, which it 

 resembles in characters other than the shape. In the closely 

 related A. rubens of the Waianae range the spire is typically 

 wider, not so strictly conic ; but at one time one of us thought 

 it must be ranked as a variety of rubens. The black cuticle 

 and more rectilinear sides of the spire separate seminigra 

 from intermedia.. 



37. A. TENUILABRIS Gulick. PI. 31, fig. 19. 



' ' Shell dextral, ovate-conic, hardly shining, somewhat roughly 

 striated with growth-lines; white under a fulvous epidermis, 

 which is generally worn off below the suture on the last whorl. 

 Whorls 5y 2 , a little convex. Aperture subquadrate, white, 

 not as long as the spire ; peristome thin ; columella straight, 

 provided with a small median fold ; lips connected by a very 

 thin callus. Length 15, diarn. 8 mm." (Gulick}. 



Oahu: Pauoa (Frick, type loc.) ; Nuuanu (Cooke). Type 

 in coll. Boston Society. 



Amastra tenuilabris Gulick in GULICK and SMITH, P. Z. S., 

 1873, p. 83, pi. 10, f. 16. PFR., Monogr., viii, p. 241. Amas- 

 tra t., SYKES, Fauna Hawaiiensds, p. 345. 



" The specimens received are reported by Dr. Frick to be 

 from Pauoa, on Oahu ; but there is some reason to believe that 

 they could not have been found on Oahu. Its affinities are 

 uncertain, but it may be allied to Am. flavescens Nwc., which 

 is found on the island of Hawaii" (Gulick). 



The original specimen of this variety, examined by Hyatt, 

 is very close to A. rubicunda Baldwin. Gulick's shell agrees 

 very closely with two shells from Nuuanu in the Cooke collec- 

 tion. The differences between this and rubicunda consist in 

 the wanner hue of the latter and its usually but not invari- 



