230 ACHATINELLA BELLULA. 



Series of A. casta. 



The shells are smaller than most of the vulpina group, and 

 often more slender; they are never green. Species of this 

 series inhabit ridges from Mt. Tantalus to Helemano. 



19. A. BELLULA E. A. Smith. PL 41, figs. 10 to lOd ; pi. 48, 

 figs. 1 to 18. 



"Shell dextral, long-subconic, imperf orate, glossy, very 

 lightly striate with lines of growth, dilute chestnut (the spire 

 paler) streaked with darker, and encircled with a few obsolete 

 lines of a somewhat chestnut color, and a nearly black zone 

 (sometimes wanting) below the periphery. Whorls 6%, a 

 little convex; suture lightly bordered with chestnut. Aper- 

 ture short, % of the length, white inside ; peristome with the 

 margin thin, slightly thickened within. Columellar fold 

 rather strong, purple. Length 20, diam. 10 mm. 



"Habitat, Sandwich Islands. Somewhat of the form of 

 johnsoni Newc., but the whorls are less tumid, especially the 

 last, and the painting is different' 1 (Smith). 



Oahu : Pauoa slope of Tantalus and the main ridge at head 

 of Manoa, northwest to the Kalihi-Kahauiki ridge ; only high 

 on the ridges, chiefly on leaves of lehua, Straussia and guava. 



Achatinella bellula SMITH, P. Z. S. 1873, p. 77, pi. 9, f. 8. 

 THWING, Orig. Descript., Occ. Papers B. P. B. Mus. iii, p. 56, 

 pi. 1, f. 15. A. bellulae Smith, HARTMAN, Proc. A. N. S. Phila. 

 1888, p. 32. Achatinella multizonata BALDWIN, Proc. A. N. S. 

 Phila. 1895, p. 215, pi. 10, f. 1, 2. COOKE, Occasional Papers 

 B. P. B. Mus. ii, pp. 65-76. 



A. bellula stands close to A. casta, from which it differs by 

 being invariably dextral, with the spire a little stouter, its out- 

 lines perceptibly convex. Also it is often larger and more 

 solid. It is the southeastern member of the casta series. The 

 locality was unknown to Mr. Smith, but specimens from the 

 head of Pauoa (pi. 48, fig. 1, collected by C. M. Cooke) agree 

 perfectly with the figured type, and that place may be con- 

 sidered the type locality. It is most abundant on the ridges 

 of Manoa, Pauoa and Nuuanu valleys. The color-forms from 

 Pauoa are further illustrated in pi. 48, figs, la, 2 ; pi. 41, figs. 



