THE NAUTILUS. 137 



This species was found in company with Laminella alexandri, 

 Newc. at an altitude incongenial to most Achatinellidse species. 



Amastra rubristoma, n. sp. 



Shell dextral, imperforate, solid, elongately ovate-conic, apex acute I 

 surface striated with irregular growth striae ; nuclear whorls radi- 

 ately sulcated. Color reddish-brown, sometimes almost white, upper 

 whorls darker ; generally covered 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. 



Habitat, Island of Lanai. 



This species was discovered by Mr. D. Thaanum of Hilo, Hawaii, 

 who has done much to encourage the study of Hawaiian land fauna. 



Amaslra seminuda, n. sp. 



Shell dextral, imperforate, solid, ovate, spire convexly conical, 

 apex acute ; surface covered witli rather irregular growth striae, the 

 embryonic whorls finely radiately sulcated. Color white or light- 

 brown, lower half of body-whorl covered with a densely black epi- 

 dermis, rest of the shell destitute of epidermis. Whorls 5, slightly 

 convex, suture moderately impressed. Aperture a little oblique, 

 sublunate, white within. Peristome acute, thickened within, not re- 

 flexed. Columella terminating in a broad, thin, arched, lamellar 

 plait. 



Length, 14 ; diam., 9 mm. 



Habitat, Waikolu, Is. of Molokai. 



Amastra conic a, n. sp. 



Shell fossil, dextral, minutely perforated, thin, elongately conical, 

 apex acute ; surface sculptured with fine growth lines, apical whorls 

 radiately sulcated. Color of living shell unknown. Whorls 7, con- 

 vex ; suture well impressed. Aperture oblique, oval. Peristome 

 6imple, very thin. Columella terminating in a slightly developed 

 fold. 



Length, 15^ ; diam., 8 mm. 



Habitat, Hamakua, Island of Hawaii. 



