242 AMASTRA, LANAI. 



spiral lines on the penultimate and sometimes the periphery 

 of the last whorl, becoming blackish or dark-brown behind 

 the lip. Under the cuticle the last whorl or two is light-yellow, 

 as exposed in front of the aperture. Apex reddish or purplish 

 brown, costate, but the carina is almost concealed in the suture. 

 Interior of aperture pink or white. 



Length 21, diam. 10.2, aperture 9.8 mm. ; whorls G 1 ^. 



Length 19.5, diam. 11, 'aperture 10 mm. ; whorls 6. 



This species stands very close to A. aurostoma which differs 

 by its thicker, darker cuticle, without bands ; it is also larger 

 than gray ana. (Named for J. E. Gray, then keeper of the 

 zoological department of the British Museum.) 



61. A. RUBBISTOMA Baldwin. PL 39, figs. 5, 6. 



" Shell dextral, imperf orate, solid, elongately ovate-conic, 

 apex acute; surface striated with irregular growth striae; 

 nuclear whorls radiately sulcated. Color reddish-brown, 

 sometimes almost white, upper whorls darker ; generally cov- 

 ered with a dark fugacious epidermis. Whorls 7, convex, 

 suture well impressed. Aperture a little oblique, oval, red 

 within, sometimes livid-white. Peristome acute, very slightly 

 thickened within. Columella terminating in a strong arched 

 lamellar plait, tinged with red. Length 19%, diam. 12 mm " 

 (Baldwin). 



Lanai (D. Thaanum). 



Amastra rubristoma BALDW., Nautilus, xix, April, 1906, p. 

 137. 



This species stands close to A. aurostoma, from which it 

 differs by the much shorter whorls. It stands intermediate 

 between aurostoma and ~biplicata, differing from the latter by 

 its more rotund last whorl, the yellow under-color and the 

 more glossy surface. No specimens are well enough preserved 

 to show whether the embryonic sculpture is that of aurostoma 

 or of ~biplicata. The type specimens are figured. Of the 

 three, one is entirely denuded of all cuticle, dull and flesh- 

 colored, a little yellowish on the last whorl, darkening near 

 the apex and behind the lip (fig. 6). The other shells are 

 unworn. They have a glossy yellow under-skin, mainly cov- 



