240 AMASTRA, LANAI. 



Among the specimens of A. aurostoma sent 'by Mr. Baldwin, 

 there is an interesting shell showing some characters of auros- 

 toma, though the magna type predominates (pi. 26, figs. 11, 

 12). The ground color is pale-brown on the last two whorls, 

 red-brown above. The cuticle is dense, unbroken and nearly 

 black on the last two-thirds of the last whorl. The striation 

 is more pronounced than in aurostoma, and the lower half of 

 the last whorl is conspicuously malleate, a feature not very 

 clearly indicated in the figure. The aperture is yellow within, 

 as in aurostoma, but some magna have the same color. Length 

 24.2, diam. 11.5 mm. 



Color- var. balteata n. v. (pi. 26, figs. 7, 8). A small form 

 in which the spire is brown, last whorl gradually becoming 

 lighter, whitish in its last third, and encircled by a white 

 peripheral band, visible as an angular white line close above 

 the suture on the spire. Embryonic whorls costate and cari- 

 nate. No cuticle remains ; striation well developed on the last 

 whorl. Aperture small, acutely ovate, somewhat periform, 

 flesh-colored inside. Columellar fold small and oblique. 

 Length 23.6, diam. 12.3, aperture 11 mm. ; whorls 6y 3 (fig. 8). 



59. A. AUROSTOMA Baldwin. PI. 26, figs. 13, 14. 



The shell is imperforate, oblong-conic, solid, yellow under 

 a dark chestnut cuticle, which is smooth, rather glossy, and 

 on the spire streaked with yellow; apex red-brown. Embry- 

 onic whorls costate and carinate, the earina very close to the 

 suture. Subsequent whorls slightly convex, with sculpture 

 of low striae, which are weaker on the last whorl, which is regu- 

 larly elliptical and not malleate. The aperture is ovate, yellow 

 within; outer lip without a lip-rib. Oolumella yellow, bearing 

 a strong fold of the same tint. Parietal callus tinted, typically 

 thick. 



Fig. 13. Length 25, diam. 12.6, aperture 11 mm. ; 6!/2 

 whorls. 



Fig. 14. Length 23.5, diam. 12, aperture 11.8 mm.; 6y 2 

 whorls. 



" Animal when extended in motion as long as the shell; 

 mantle dark slate, margined on the outer side with, reddish- 



