170 ACHATINELLA FUSCOBASIS. 



11. A. FUSCOBASIS (E. A. Smith). PL 35, figs. 1 to 4. 



Shell ovate, sinistral, glossy; white, the last whorl yellow- 

 ish, ornamented with a median zone and (base of brown. 

 Whorls 6, a little convex, suture distinctly margined. Aper- 

 ture white; peristome thick, 'brown, columellar fold strong. 

 Length 16, diam. 10 mm. High up on Mt, Kaala on the M'o- 

 kuleia side, on the island of Oahu, arboreal. (Smith.) 



Oahu: Head of Kuliouou-Niu division ridge to Mt. Olym- 

 pus, at the head of the Palolo-Manoa ridge (Spalding, Cooke, 

 Kuhns and Wilder). 



Bulimella fuscobasis SMITH, P. Z. S., 1873, p. 77, pi. 9, f. 

 15. Achatinella fuscobasis Sm., THWING, Original Descrip- 

 tions, etc., p. 83. Achatinella luteostoma BALDWIN, Proc. 

 Acad. Nat. Sci. Phila., 1895, p. 217, pi. 10, f. 7, 8 (Palolo to 

 Niu). B. rosea, a small white variety with a yellow lip, 

 HARTMAN, Proc. A. N. S. Phila., 1888, p. 30, pi. 1, f. 4. 



A. fuscobasis has the white ground of A. t&niolata, but it 

 is invariably sinistral in a large number I have seen in var- 

 ious collections. It is also smaller, with the lip not so thick, 

 the columellar margin less raised, and it has a different range 

 of patterns. The reddish-brown color (mars orange, or burnt 

 sienna, rarely chestnut or light orange-yellow of Ridgway's 

 Color Standards) of the peripheral and basal bands, and the 

 brown peristome are also characteristic of the typical form. 

 The following color-forms occur in most colonies. 



(a) Pure white with brown (liver-brown to dull-chestnut) 

 peristome. Typical color-form of A. luteostoma (fig. 2). 



(b) Peripheral band and basal patch brown, the space be- 

 tween them white or yellowish-brown. Typical color-form of 

 A. fuscobasis (pi. 35, fig. 1, type-specimen). 



(c) Same as b, but a basal band in place of the patch (fig. 

 3). 



(d) Same as b or c, except that there is a light-brown band 

 near the suture. In one shell from Mt. Olympus in the 

 Spalding collection the upper and lower bands are broad, 

 light-brown, the peripheral band narrow, darker. 



(e) Whole base brown, dark or light (fig. 4). 



Most of the specimens from Kuliouou (Spalding and 



