ACHATINELLA SOWERBYANA. 177 



em collector will ever get. The shells are either plain except 

 for the sutural band (pi. 34, fig. 9, Kaipapau), or have a 

 band around the base, as in pi. 34, fig. 10 from Kaliuwaa val- 

 ley near the Castle trail. This shell measures, length 19.2, 

 diam. 10, aperture 9 mm. ; 6% whorls. 



In one lot from the Kaipapau end of the Oastle trail, no. 

 1866 Spalding <coll., there are 20 of the plain typical form 

 with a sutural 'band only, 3 with 'a basal band. There is also 

 one chestnut specimen 'with -a light sutural band. It has 

 also been taken by Mr. Thurston in the banana patch in Kai- 

 papau along the Oastle trail towards Punaluu. 



Color-form oviformis ' N.' Pfr. PL 34, fig. 11; pi. 30, fig. 

 lla. " Shell sinistral, imperf orate, ovate-conic, solid, striatu- 

 late, white under a glossy olivaceous epidermis, one to three 

 banded with brown. Spire eonvexly-conic, the apex rather 

 acute, white. Suture deeply margined. "Whorls 5, scarcely 

 convex, the last about three-sevenths the total length. Aper- 

 ture nearly diagonal, ear-shaped; columellar fold moderate, 

 tooth-like, reddish ; peristome unexpanded, the margins joined 

 by a thin callus, the outer margin labiate within; ;columellar 

 margin dilated, adnate. Length 17, diam. 8%, aperture 

 7% mm. long, 4 wide. Oahu, Newoomb " (Pfr.). Type in 

 Pf eiffer 's collection. 



Mr. Sykee has referred Pf eiffer '& sinistral form of A. mul- 

 ticolor to oviformis, no doubt correctly. Pf eiffer 's figure is 

 reproduced in pi. 30, fig. lla. Specimens from Kaliuwaa are 

 three-banded with brown (" Hay's russet ") on a wax-yellow 

 ground, pi. 34, fig. 11, coll. by Spalding. It seems to be 

 merely a color-form or mutation of typical sowerbyana, 

 hardly worthy of a name. 



. A. SOWERBYANA THURSTONI P. & C., n. SU'bsp. PI. 34, 



figs. 13 to 146. 



The shell is invariably sinistral; ground-color wax-yellow 

 below the periphery, white above it, with a band of burn/t- 

 sienna below the periphery. Sutural margin defined by a 

 deep line, usually with an inconspicuous, scarcely noticeable, 

 dark line next the suture. Apex generally tipped minutely 



