AM ASTRA, KAUAI. 149 



4. A. SPH^ERICA Pease. PI. 15, figs. 4, 5 (x 2) ; pi. 42, fig. 12. 



The shell is narrowly umbilicate, globose-conic, moderately 

 solid, the spire dull purplish-brown, last whorl in large part 

 purplish-brown or chestnut, fading to rather bright yellow in 

 the last third or fourth. Whorls 5, moderately convex, the 

 last very obtusely subangular in front, becoming rounded in 

 its last half or third; in old shells it descends distinctly to 

 the aperture. The outlines of the spire are straight, or very 

 little contracted near the apex. First whorl smooth, the next 

 very finely, not sharply, striate; last two whorls are finely, 

 sharply striate, the striae quite irregular and unequal. Suture 

 impressed. The aperture is oblique, ovate, -white within. 

 Outer lip regularly curved, obtuse, thickened within ; colu- 

 mellar lip o<blique, straight, dilated, bearing a strong, sub- 

 horizontal lamella at its lower third. Umbilicus narrow, well- 

 like, partly covered by the expanded columellar lip. 



Length 10, diam. 11.1 mm. (pi. 15, figs. 4, 5). 



Length 10.6, diam. 10.2 mm. (pi. 42, fig. 12). 



Kauai (Pease) : Puukapele. Type in Mus. Comp. Zool. 



Amastra sph&rica PEASE, Journ. de Conchyl., xviii, 1870, 

 p. 94. Ackatinella sphcerica Pease, CROSSE, J. de C., xxiv, 

 1876, p. 98, pi. 1, f. 5, 5a. PFR., Monogr., viii, p. 235. BALD- 

 WIN, Catalogue, p. 10 ("Lanai"?). A. sphoerica Pse., HART- 

 MAN, Proc. A. N. S. P., 1888, p. 50. 



A. splicerica is most closely related to A. cyclostoma, from 

 which it differs conspicuously by the form of the last whorl, 

 the larger columellar lamella and the smaller size. There is 

 no tendency to agglutinate foreign matter to the shell, as in 

 A. obesa and A. ag glut i nans. The surface of A. obesa is less 

 sharply striate than in A. sph&rica. Figures 4, 5 of plate 15 

 represent a specimen barely mature. An old shell is drawn 

 in pi. 42, fig. 12. Both were received from Pease, and doubt- 

 less formed part of the original lot. 



Series of A. umbilicata. 



The shell is umbilicate or quite openly perforate, acutely 

 ovate ; the embryonic whorls are smooth and convex. 



This is the most widely distributed Amastrine group except 



