AMASTRA, HAWAII. 313 



or less strongly angular peripherally, and the surface espec- 

 ially on the base, has spiral grooves or sulci, sometimes very 

 lightly impressed. The last whorl is covered with a yellow, 

 glossy inner cuticle, exposed in front of the aperture, else- 

 where concealed by a dull-brown outer cuticle with blackish 

 streaks. The interior and 'columella are blue-white, the 

 columellar fold small and very oblique, and the axis rather 

 openly perforate. 



Length 14, diam. 8 mm. ; 5~y 2 whorls. 



Length 13, diam. 8 mm. ; 5y 2 whorls. 



At Kukaiau the shells collected by Mr. Thaanum are but 

 weakly angular peripherally, and the epidermis, brown and 

 somewhat streaked on the spire, becomes intensely black on 

 the last whorl. Length 13, diam. 8 mm. (pi. 47, fig. 7). 



Three smaller shells in Cooke collection (no. 2267) are nar- 

 rower, with the peripheral angle very weak or wholly lacking 

 on the last whorl. Length 11, diam. 6.6 mm. 



Another lot (57713, A. N. S. P.) consists of small shells 

 with the angle obsolete or wanting, and dull whitish or pink- 

 ish under the dull brown cuticle, having no glossy, yellow 

 layer. These probably form a distinct subspecies, but the 

 exact locality is unknown. Length 12, diam. 7.1 mm. 



107. A. CONICA Baldwin. PI. 47, fig. 8. 



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

 conical, apex acute ; surface sculptured with fine growth-lines, 

 apical whorls radiately sulcated. Color of living shell un- 

 known. Whorls 7, convex; suture well impressed. Aper- 

 ture oblique, oval. Peristome simple, very thin. Columella 

 terminating in a slightly developed fold. Length 15y 2 , diam. 

 8 mm." (Baldwin). 



Hawaii: Mana, district of Hamakua, fossil (H. W. Hen- 

 shaw) . 



Amastra conica BALDWIN, Nautilus, xix, p. 137. 1906. 



This species has about the contour of A. henshawi, from 

 which it differs by its thinness, the muck more convex and 

 more numerous whorls, and the very finely but sharply striate 

 embryonic whorls. The largest of several of the type lot sent 



