1895.] NATURAL SCIENCES OF PHIJjAESE.LP.HIA. 231 



Length, 202 ; diam. 10] mm. 



Habitat, Ewa, Island of Oahu. 



The distribution of this species, as far as observed, is quite limited. 

 We do not know of any species approaching it in form or specific 

 characteristics. Its somewhat smooth and polished surface dis- 

 tinguishes it from most of the species of the Amastra section. 



Amastra pellucida, n. sp. PI. XI. figs. 41, 42. 



Shell dextral, imperforate, very fragile, thin, translucent, glo 

 hosely conic, apex rather acute; surface lusterless, sculptured with 

 fine incremental lines, apical whorls smooth. Color light-brown, 

 apex darker; destitute of epidermis. Whorls 5£, somewhat convex; 

 suture moderately impressed. Aperture oval, a trifle oblique, 

 livid-white within; peristome simple, thin; columella white, ilexuous, 

 abruptly terminating in a thin lamellar plait. 



Length, 12]; diam. 8 mm. 



•Habitat, Waianae Valley, Island of Oahu. 



Animal of a uniform brown color; the head above and tentacles 

 of a darker shade. The action of the heart is plainly visible 

 through the thin texture of the shell. When first collected the 

 pulsations were about fifty per minute, growing slower and fainter 

 from day to day until the animal died. 



This species is well characterized by its thin pellucid texture, 

 globose form, abbreviated spire, and light brown color. 



Amastra breviata, n. sp. PI. XI, figs. 45. 4t;. 



Shell dextral, very minutely perforated, rather thin, globosely 

 conical, apex rather acute ; surface not polished, covered with fine 

 incremental lines, the nuclear whorls smooth. Color corneous- brown, 

 destitute of an epidermis. Whorls 6, slightly convex; suture well 

 impressed. Aperture a trifle oblique, oval, livid-white within, 

 showing the color of the exterior; peristome simple, thin, extremities 

 joined by a thin white or brown callosity; columella white, flexuous, 

 abruptly terminating in a thin lamellar plait. 



Length, 12?; diam. 1\ mm. 



Habitat, Palolo and Halawa, Island of Oahu. 



This shell approaches the preceding species in its form; but may 

 be readily distinguished by its thicker texture and darker color. 

 The habitats are also widely separated and the animals differ. 



