90 AURICULELLA, OAHU. 



10. A. MINUTA C. & P., n. sp. PL 25, figs. 5 to 9. 



Shell narrowly perforate, dextral, ovately conic; the last 

 whorl is cartridge buff with some faint cinnamon streaks, 

 shading to cinnamon on the spire, thin, slightly translucent, 

 .glossy, under a lens minutely striate with lines of growth. 

 Spire conic, apex obtuse. Suture slightly impressed, mar- 

 .ginate. Whorls 5%, slightly convex, the last rotund, subsac- 

 cate at the base. Aperture irregularly ovate. Parietal lamella 

 small, thin, whitish, standing at an angle of about 45 degrees 

 with the axis. Columella edentulous, slightly twisted. Lip 

 thin, slightly expanded, outer margin convex, columellar mar- 

 gin reflexed and nearly adnate. Umbilicus narrow, sublim- 

 ate. Length 4.8, diam. 3.7 mm. 



Oahu: Nuuanu (Cooke), Palolo (Lyman, Cooke). 



This shell is closely related to A. perpusilla. It differs, 

 however, in its more elongate and conic form, less convex 

 whorls and much narrower umbilicus ; it is always dextral, or 

 at least in more than 700 examples no sinistral specimens 

 have been found. There are six color varieties found in Nuu- 

 anu, viz.: (a) the corneous type color; (fr) unicolorous dark 

 chestnut; (c) dark chestnut with a broad white band at the 

 periphery of the last whorl and extending under the suture 

 of the penultimate whorl; (d) corneous with a rather narrow 

 dark band at the periphery of the last whorl; (e) light chest- 

 nut with a similar band at the periphery and (/) a darker 

 chestnut similarly banded, with a light base and the dorsal 

 surface of the last whorl dark chestnut. 



The shells from Palolo are all unicolorous, corneous. 



11. A. PERVERSA Cooke, n. sp. PI. 25, figs. 3, 4. 



The shell is minutely perforate, sinistral, broadly ovate, 

 unicolorous, dark chestnut, thin, slightly translucent, under a 

 lens minutely striate with lines of growth. Spire conic, the 

 summit obtuse, apex minute, pale. Suture impressed, nar- 

 rowly margined. Whorls 5%, convex, the last ventricose, sac- 

 cate at the base. Aperture slightly oblique, diagonal, irregu- 

 larly ovate. Columella with a minute fold deep within, and 

 {under a lens) with a very minute, thin, perpendicular fold 



