AMASTRA. 41 



serve to connect the series of A. petricola and that of 

 A. pusilla, and it is doubtful whether these small Amastras 

 should not all be placed in one "series." A. pusilla has not 

 been found by any subsequent explorer of Lanai, its habitat 

 on that island resting upon Dr. Newcomb's statement only. 



Mauian Amastras. 

 A. GONIOPS P. & C., n. sp. PL 4, fig. 1 to 5. 



The shell is imperforate or narrowly perforate, solid, bi- 

 conic, vandyke brown, the denuded surface in front of the 

 aperture usually lighter, pecan brown ; rather dull. Surface 

 lightly marked with growth-wrinkles, sometimes having some 

 spiral striae above the periphery. Periphery acutely angular 

 or carinate in front, becoming rounded in the last half or 

 less. Spire convex in the lower, slightly concave in the upper 

 part. Embryonic whorls very finely, sharply striate, the em- 

 bryonic shell (fig. 2) angular at the periphery, very similar 

 to that of A. obesa. Aperture quite oblique, the interior 

 white, or tinted with pale blue, pink or violaceous; lip-rib 

 strong, nearly white. Columella short, with a strong, not 

 very oblique fold. 



Length 11.2, diam. 7.2 mm. ; 51/2 whorls. 



Length 11, diam. 7 to 7.5 mm. 



West Maui: upper Olowalu gulch (D. Thaanum, July, 

 1913). Cotypes in coll. A. N. S. P. and Bishop Museum. 

 Also in coll. D. Thaanum. Mt. Lihau and Mt. Helu, rare 

 (Thaanum). 



A peculiar and strongly individual species having some 

 affinity to the much larger and rougher A. nigra. The dense 

 texture, smooth surface, half-carinate last whorl and Cycla- 

 mastra-like apical whorls are its most striking features. It 

 was found in some abundance in the type locality. It does 

 not agglutinate, though a few shells are dirty (fig. 4), as in 

 all Amastras. A. agglutinans Nc., of West Maui is quite 

 different, being more depressed, umbilicate, loaded with dirt 

 at the periphery, and it has the rough cuticle of A. obesa. 



