240 ACHATINELLA CASTA. 



Merely a color-form of A. cast a. The type specimen is no. 

 76 Boston Society of Natural History. It has been figured 

 by Smith, and is shown on pi. 41, fig. 12. The last 1% 

 whorls are streaked with ochraceous-tawny on a light ochra- 

 ceous-buff ground, which fades to white on the upper whorls. 

 There is a faintly darker line below the suture on the last 

 whorl ; columella fold pale lilac. Length 18, diam. 10 mm. 

 This coloration is rare in casta, but is a common pattern in 

 A. bellula, which differs by being dextral. 



Mr. Spalding has found shells in the southeastern ravines of 

 Waiawa (his No. 582) which agree exactly with concolor ex- 

 cept by being smaller. They occur with a more slender 

 banded form with weak columellar fold (pi. 49, fig. 6) recall- 

 ing juncea; with white specimens becoming light yellow on the 

 last whorl, or with a yellow base ; and with various brown- 

 banded and streaked forms. 



Achatinella cuneus Pfr. "Shell imperf orate, whitish or 

 buff, variously ornamented with narrow brown bands. Spire 

 convexly conic, the apex white, rather acute ; suture bordered 

 by a chestnut line. Whorls 6, nearly flat, the last slightly ex- 

 ceeding one-third of the length. Aperture nearly diagonal, 

 semioval, white within ; columellar fold moderate, obliquely 

 somewhat twisted ; peristome acute, labiate within, columellar 

 margin adnate. Length 18, diam. 8 mm., aperture 8 mm. 

 long, 3i/ 2 wide. Oahu, Frick' ' (Pfr.) . 



A. cuneus has been placed in the synonymy of A. decipiens 

 by Dr. Newcomb. Mr. Sykes allows it to stand as a species 

 in Achatinellastrum. There appears to be no tangible differ- 

 ence between the description of cuneus and A. casta, and Dr. 

 Cooke, who examined the type, considers it a color-form of 

 casta. 



20a. A. CASTA MARGARETS Pilsbry & Cooke, n. subsp. PL 42, 

 figs. 9, 10. 



The shell is sinistral, imperforate, thin, ovate-conic, white 

 with two cinnamon bands, the lower usually wider, and both 

 tessellated by the crossing of paler streaks; there is a pale 

 pink band below the suture and a darker one bounding the 



