208 ACHATINELLA STEWARTII. 



mella and interior of the aperture white. Sandwich Islands" 

 (Reeve). 



Length 27, diam. 14 mm. (from figure). 



Mt. Tantalus, from the rim of the "bowl" or crater to the 

 head of Makiki valley ; also on the Pauoa slope down to about 

 1100 ft. ; on the bark of kukui, ti, guava and other trees and 

 bushes. 



Achatinella producta REEVE, Conchologia Iconica vi, pi. 2, 

 f. 13, April, 1850. GULICK, Evolution, Racial and Habitu- 

 dinal, p. 41, pi. 2, f. 15 (Makiki). THWING, Orig. Descript. 

 pi. 1, f. 13. Achatinella bilineata REEVE, C. Icon, vi, pi. 3, 

 f. 22, April, 1850. Achatinella venulata NEWCOMB, P. Z. S. 

 1853, p. 146, pi. 23, f. 48a. Achatinella hybrida NEWCOMB, 

 P. Z. S. 1853, p. 147, pi 23, f. 52. Achatinella dunkeri Cum- 

 ing MSS., PFEIFPER, P. Z. S. 1855, p. 208; Monographia iv, 

 531. GULICK, Evolution, etc., p. 41, pi. 2, f. 14 (Makiki). 

 Achatinella vulpina Fer., GULICK, Ann. Lye. vi, p. 1858, p. 

 244 ; not of Ferussac. 



A. s. producta is a larger, more capacious form tkan A. 

 stewartii, the last whorl more rotund, and the suture usually 

 without a dark border. The typical form is dextral, of a 

 clear primrose-yellow tint (varying however in different in- 

 dividuals from colonial buff to green), with the summit, aper- 

 ture and columellar fold white. The lip is a little thickened 

 within. Sometimes the periphery is indistinctly angular. 

 Size generally large. 



Length 27, diam. 14.2 mm.; 6% whorls (fig. 7). 



Length 25, diam. 13 mm.; 7 whorls (fig. 9). 



Length 21.5, diam. 12.3 mm. ; 6% whorls. 



In the head of Makiki valley the shells are usually dextral 

 (fig. 9), rarely sinistral; on the summit of Tantalus they are 

 all sinistral (figs. 7 to 8a southeastern rim of 'bowl"). On 

 the Pauoa slope of Tantalus all are dextral. The size is 

 sometimes not greater than that of A. stewartii. The chief 

 color-patterns are : 



1. Producta pattern, pi. 38, figs. 7, 9, described above. 



2. Dunkeri pattern, pi. 38, figs, la to 7c. Streaked with 



