238 ACHATDSTELLA CASTA. 



Waiawa in many places, and everywhere in colonies of several 

 colors and patterns. PL 41, figs. 15, 15a, 15&, 16 ; pi. 49, figs. 7, 

 8, represent specimens collected by Mr. Spalding, part of 

 his no. 1863. The rarest and almost unique patterns figs. 15 

 to 15& still belonging to his collection. PL 49, figs. 9 to 15 are 

 specimens collected by Mr. Kuhns and given me by Mr. 

 Thaanum. The darker shells of this lot also being rare pat- 

 terns. The ground-color is white, shell-pink or yellow, band- 

 less or with two dark zones (brown to almost black), or rarely 

 with many lines. A sutural dark band is often present. The 

 columella is almost always lilac, but rarely white in albino 

 shells. The embryonic whorls are usually white, very rarely 

 having a broad brown band. Length 18, diam. 9.6 mm. 



In the western ravines of Waiawa Mr. Spalding found a 

 small form, length 15-16 mm., with the last two whorls yellow, 

 spire ivory yellow indistinctly streaked with cream buff. It 

 is practically identical with the form from Waipio called 

 A. pygmaa by Mr. Smith. 



The original descriptions of forms now referred to A. cast a 

 here follow. 



"Achatinella ligata Sm. [PL 24, fig. 21]. Shell dextral (or 

 sinistral), elongate-ovate-subconic, moderately shining, very 

 minutely striated with growth and transverse lines; whitish, 

 more or less streaked with buff-olivaceous, encircled with usu- 

 ally two pale brown zones, one above, the other below the per- 

 iphery. Whorls 51/2, a little convex, suture distinctly mar- 

 gined, girdled with deep brown. Aperture white; peristome 

 slightly edged within, columellar fold strong, roseate. Length 

 19, diam. 10 mm. 



"Var. a. Shell more lengthened. Length 21, diam. 9 mm. 

 (pl.24, fig. 20). 



"Var. &. Shell white, the last whorl encircled with several 

 narrow yellow zones." (Smith). 



Oahu: "reported to be from Waimalu." Type in British 

 Museum. 



"It has somewhat the aspect of dextral forms of A. varia 

 Gk., but is more elongate and cylindrical" (Smith). 



Achatinella ligata was based upon mainly dextral shells of 

 the pattern of pi. 41, fig. 13&. The figures on pi. 24 are 



