AMASTRA, OAHU. 219 



Wahiawa topotypes of nigrolabris from the Gulick collec- 

 tion measure: 



Fig. 14. Length 18.7, diam. 11.8, aperture 9 mm. 



Fig. 15. Length 20.5, diam. 11, aperture 8.5 mm. 



In Kahana valley (C. M. Cooke coll.) the shells are rather 

 small. Some have typical spirizona pattern, others transi- 

 tional, others typical nigrolabris pattern (pi. 35, figs. 11, 13). 

 Specimens measure : 



Length 16, diam. 10 mm. 



Fig. 11. Length 19.5, diam. 10.8 mm. ; 6y 2 whorls. 



Fig. 13. Length 19, diam. 11 mm. 



Length 18.3. diam. 9.5 mm. 



Specimens have been examined from Waimea, Kawailoa 

 (fig. 10), Helemano, Wahiawa, Opaiula, Ahonui, and Kalai- 

 koa on the southern slope of the range, collected by Gulick, 

 and from Kahana on the northern slope, collected by C. M. 

 Cooke, Jr. 



A few specimens from Kawailoa, Helemano 'and Wahiawa 

 have the base of the shell of a rusty red-brown color, in place 

 of the usual dark purple-brown, the upper surface being light 

 buff. These forms resemble A. s. rudis save that the light 

 band extends to the periphery. 



486. A. s. rudis (Pfeiffer). PI. 33, fig. 10. 



Shell subimperforate, ovate-turrite, solid, rudely striate, 

 fulvous-brown; spire elevated-conic, the apex rather acute, 

 suture simple, very lightly crenulate. Whorls T 1 /^ moderately 

 convex, the last scarcely forming two-fifths the total length, 

 rotund. Aperture oblique, sinuate-oval; columellar fold me- 

 dian, laminiform, subtransverse ; peristome simple, acute, the 

 columellar margin dilated, reflexed, subadnate. Length 21, 

 diam. 11.5. aperture 9 mm. long, 5 wide (Pfr.). 



Var. b. Chestnut, with buff median and basal bands, spire 

 less lengthened (Pfr.). 



Sandwich Is. (Frick). 



Achatinella rudis PFR., P. Z. S., 1855, p. 5, pi. 30, f. 17; 

 Monogr.. iv, 549. 



Pfeiffer's type figure, copied in fig. 10, represents a form 



