VARICELLA, JAMAICA. 109 



narrow longitudinal striae, close above, distant below. Whorls 

 7. Lip thin, retracted below. Columella arcuate. Diver- 

 gence 14 degrees, length .27, diam. .07 inch. (C. B. Ad.). 



Jamaica (C. B. Ad.). Williamsfield (J. B. Henderson). 



Achatina pellucens AD., Proc. Boston Soc. Nat. Hist, ii, 

 1845, p. 13; Contrib to Conch, no. 6, p. 90. PFR., Monogr. 

 ii, p. 295; iii, 502. 



The single type specimen- is figured. It is an acicular, 

 glossy, translucent whitish- corneous shell. The first 2% 

 whorls are smooth, forming a eylindric embryonic portion; 

 then narrow grooves abruptly begin, and the next two whorls 

 have them rather -close and regular. The last 2% whorls 

 have widely spaced grooves, 9 or 10 on each whorl ; three on 

 the last, two on the penult, being varieeal or growth-arrest 

 grooves, slightly deeper than the others, and preceded by 

 a very faint brown streak. There are 6% whorls in all, the 

 post-embryonic ones being gently 'convex, more convex just 

 below the suture. The aperture is small, oblique; the outer 

 lip arched forward above. The columella is deeply concave' 

 above and truncate basally. The basal margin is effuse or 

 receding. Length 6.5, diam. 1.66 mm. 



A specimen taken by Henderson at Williamsfield is larger, 

 length 7.3, diam. 1.8 mm., with 7% whorls, and the grooves 

 are not so widely spaced on the last two whorls, the dis- 

 parity between the earlier and later whorls being less marked 

 than in Adams's type. In basal view the false-umbilicus is 

 barely visible, being much narrower than in V. clappi. 

 The latter species is also narrower and tapers less rapidly. 



53. V. CLAPPI Pilsbry, n. sp. PI. 18, figs. 24, 25. 



The shell is acicular, thin, glossy, whitish-corneous and 

 somewhat transparent, composed of 7 whorls, the first 2% 

 smooth, forming a somewhat eylindric summit. The follow- 

 ing whorls are sculptured with slightly arcuate, regular and 

 rather close longitudinal grooves, of which there are about 

 30 on the last whorl. At the periphery they disappear, 

 leaving the base smooth. There are a few faint brown vari- 

 eeal streaks, about 2 on a whorl. The sutures are narrowly 



