172 ACHATINELLA FUSCOBASIS. 



A. fuscobasis is a species of the high ridge and peaks of 

 the main range. Northeast of Mt. Olympus, on the ridge 

 leading to Konahuanui, it passes into an undifferentiated 

 form having the 'brown or 'brown-tinted lip of fuscobasis and 

 the more capacious shape of lyonsiana (which also rarely 

 shows some brown on the lip, in the type locality). An in- 

 spection of series in the collections of Messrs. Spalding, 

 Thurston and Wilder convinces me that the Honolulu con- 

 'Chologists are right in regarding lyonsiana as a variety of 

 fuscobasis. 



Ha. A. FUSCOBASIS LYONSIANA Baldwin. PL 35, figs. 5, 6, 7. 



" Shell sinistral, imperf orate, solid, ovate; spire convexly 

 conical, apex obtuse; surface shining, striated with delicate 

 growth-lines; apical whorls smooth. Color white, with two 

 reddish-brown Ibands, one encircling the base, the other pass- 

 ing around the periphery and revolving on the spire just 

 above the suture ; the two 'bands are sometimes confluent, and 

 often the shell is uniform white, without bands. Whorls 6, 

 narrowly margined above, somewhat 'convex; suture moder- 

 ately impressed. Aperture oblique, white within, sinuately 

 oval; peristome white, rather obtuse, thickened within, basal 

 and columellar margins slightly expanded, extremities united 

 by a very thin callus ; columella terminating in a strong, tor- 

 tuous, white fold. Length 17, diam. 11% mm. 



' ' Animal : Mantle black, sometimes mottled with white, 

 margined with a narrow line of lighter shade. Superior and 

 under portion of foot light brown. Tentacles, tentacular 

 sheath, and front a'bove very dark 'brown " (Baldwin). 



Oahu: Mt. Konahuanui, at about 3,000 ft. elevation (type 

 loc.) to the top, spreading on the ridge southeastward, where 

 it passes into fuscobasis. 



Achatinella lyonsiana BALDWIN, Proc. A. N. S. P. Phila, 

 1895, p. 218, pi. 10, f. 9, 10, H.-^SUTER, t. c., p. 239, pi. 11, 

 f. 52 (teeth). 



A larger, more 'capacious shell than A. fuscobasis, with the 

 lip and >columella white. The patterns are : 



(a) Pure white. 



