334 ACHATINELLA VALIDA. 



indicate that it was made in Kawailoa district. Swainson's 

 type was a larger, more variegated shell than that figured by 

 Chemnitz, and more fairly representative of the species. The 

 description of A. perversa follows. " Shell reversed, subtro- 

 chiform, fulvous brown with darker transverse bands and lon- 

 gitudinal lines; apex and suture white ' (Swainson). 



The original description of A. tumefactus follows. 



"Apex tumefactus Gk. Shell perforate, sinistral, globose- 

 conic, glossy, striated with growth and indistinct spiral lines ; 

 white, encircled with a few olivaceous-brown zones; suture 

 margined ; spire slightly concave ; whorls 6, the first blackish, 

 first 3 or 4 a little convex, the rest convex ; aperture receding, 

 white ; peristome dilated, thickened within ; columellar fold 

 strong, white. Length 19, diam. 12 mm. 



"Var. a. Shell streaked with olive-brown, interrupted by 

 two or three white zones ; suture white margined. 



"Var. ~b. Shell streaked with fawn, black or brown, inter- 

 rupted by a wide white zone at the periphery; suture white 

 margined. 



' ' Station. On trees and shrubs. Habitat : Wahiawa ; rarely 

 in Helemano. Affinities: It is related to A. decorus Fer. 

 (syn. A. perversus Swn.), which is found in Helemano and 

 Kawailoa. It is distinguished by its smaller size, its con- 

 cavely conical spire, and its paler color, which is differently 

 distributed. The three upper whorls of A. decorus are of a 

 yellowish tinge ; in this species they are white, terminated 

 with a black dot, which is not found in the typical forms of 

 the other species. Remarks : This species is never dextral. 

 The shell figured is from Wahiawa' 1 (Gulick}. 



39. A. VALIDA Pfeiffer. PI. 30, fig. 24 ; pi. 52, figs. 15 to 



"Shell imperf orate, dextral (more rarely sinistral), ovate- 

 conic, solid, smoothish, ashy-brown, somewhat banded with a 

 pale tint and streaked with black. Spire elevated, conic, the 

 apex brown, acute ; suture margined, white. Whorls 6, the 

 first three flat, those following a little convex, the last whorl 

 about two-fifths the length, inflated. Aperture oblique, trun- 

 cate-auriform. Columellar fold above, nodiform, a little 

 twisted; peristome brown-bordered, the right margin nearly 

 unexpanded, somewhat straightened ; columellar margin di- 



