230 PROCEEDINGS OF THE ACADEMY OF [1895. 



purple ; columella white with a purple tinge, fiexuous, abruptly 

 terminating in a thin, slightly curved lamellar plait. 



Length, 19 ; diam. 9 nun. 



Habitat ; Konahuanui Mt., Island of Oahu. 



Animal, mantle brown, margin of a deeper shade. Foot brown, 

 the superior portion almost black. The formula of the dentition is 

 18.10.1.10.18. (H. Suter. ) 



In form and general appearance this species resembles Amastra 

 variegata Pfr., which inhabits a different station, and is readily 

 distinguished by its less ruddy color, sulcated apex, and essential 

 difference of animal. 



Amastra undata, n. sp. PI. XI. fig, 39. 



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

 apex rather acute, base somewhat attenuated ; surface lustreless, 

 closely and rather evenly ribbed in the direction of the growth 

 lines, the rib-stria? being slightly interrupted by several coarse, 

 transverse spiral lines, the nuclear whorls finely radiately sulcated. 

 Color light brown and dark chestnut, alternating in irregular longi- 

 tudinal undulations. Whorls 6, slightly convex ; suture moder- 

 ately impressed. Aperture a trifle oblique, sublimate, rather small, 

 white within ; peristome acute, slightly thickened within ; columella 

 white flexuous, abruptly terminating in a thin, slightly arched, 

 lamellar plait. 



Length, 17 ; diam. 12 mm. 



Habitat ; Nuuanu, Island of Oahu. 



This species is very rare and local in its distribution. Its princi- 

 pal features are the prominent rib-striae and the beautiful undulat- 

 ing markings of light and dark chestnut brown. 



Amastra badia, n. sp. PL XI, fig. 4i». 



Shell dextral, imperforate, rather thin, elongately ovate-conic; 

 surface shining, sculptured with delicate, rather close thread-like 

 rib-striae in the direction of the growth lines; embryonic whorls 

 radiately sulcated. Color dark chestnut-brown with light brown 

 zigzag or undulating lines and markings. Whorls 6£, slightly con- 

 vex; suture moderately impressed. Aperture oval, a trifle oblique, 

 livid white within, exhibiting the brown color of the exterior; peris- 

 tome acute, very lightly thickened within; columella white, flex- 

 uous, abruptly terminating in a thin, slightly arched lamellar plait. 



