176 AMASTRA, OAHU. 



21. A. DAVISIANA Gooke. PL 31, fig. 1. 



' ' The shell is perforate, dextral, subconic, with slightly con- 

 vex outlines, obtusely and faintly angular at the periphery, 

 with a somewhat flattened base, rather solid, nearly smooth, 

 distinctly and almost regularly striate just below the sutures, 

 slightly glossy, -dark reddish-brown, with an indistinct broad 

 dark band just above the periphery and continued on the 

 spire just above the sutures. Spire almost conic, apex very 

 obtuse. Suture minutely crenulate, scarcely impressed, yel- 

 lowish along its edge. Whorls 6%, the embryonic rather large 

 (for the genus), the rest increasing slowly and very regu- 

 larly, almost flat, the last descending slightly near the aper- 

 ture. Aperture small, subquadrate, oblique, bluish within. 

 Inner margin of the columella slightly diagonal, outer margin 

 nearly straight; columellar fold nearly basal, strong, thick, 

 slightly oblique. Outer margin of lip thin, slightly thickened 

 within, nearly straight above, curved below, forming some- 

 thing of an angle with the base of the columella; columellar 

 margin thin, refiexed above the umbilicus. Umbilicus small, 

 semicircular. Length 16.5, diam. 9.2, length of ap. (diag- 

 onal) 7.0mm." (Cooke). 



Oahu: About a mile from the summit of Konahuanui 

 (Davis) ; summit of Konahuanui (Spalding). Type no. 16,- 

 454, Bishop Museum. 



Amastra davisiana C. M. COOKE, Occasional Papers Bernice 

 Pauahi Bishop Museum, iii, p. 19 [215], fig. 1 (July 24, 

 1908) . 



1 ' I know of no species to which this is at all related. It is 

 entirely distinct from any of the other species of Amastra. 

 The blunt apex and very regularly coiled and almost flat 

 whorls are very peculiar. The single type specimen 1 was orig- 

 inally collected by Mr. Elmer Davis, about a mile from the 

 summit of Konahuanui. Additional specimens were found 

 later by Mr. Spalding at the summit. These are smaller, 

 slightly darker, and have about % less whorls. One of these 

 (no. 16453, Bishop Museum) measures: length 14.4, diam. 

 8.5mm." (Cooke). 



A specimen from the type locality is figured, length 15.5, 



