VARICELLA, JAMAICA. 105 



Achatina similis C. B. A., Contrib. to Conch, no. 7, p. 103 

 (April, 1850). 



The type lot in Adams's collection contains thirteen speci- 

 mens, one being drawn in fig. 10. 2 l / 2 whorls at the apex are 

 smooth, then fine vertical impressed lines begin, increasing 

 gradually, and becoming almost regularly spaced, though on 

 the later whorls there are often some minor ripples between 

 the grooves, on the flat intervals. The shell is pale yellowish 

 with rich chestnut varix-streaks, interior bluish-white. The 

 distribution of colored streaks varies in different individuals, 

 but there are generally two or three on each post-embryonic 

 whorl. On the last whorl the streaks are continuous, or there 

 may be narrow interruption at the lower third. The colu- 

 mella is very short and concave in front view, rather 

 abruptly truncate. In profile view (fig. 11) it appears 

 equally concave and generally without much callus. There 

 is somewhat wide variation in the degree of concavity among 

 different examples of the type lot and other lots before me. 

 It is often more concave than in fig. 10. In a section, the 

 slender axis is seen to bear a slender white spiral lamella, 

 less sinuous than that of V. similar-is. The largest specimens 

 measure 24 x 6, apert. 8 mm., with 8% whorls. The type 

 locality is unknown, but the typical form occurs at Bogwalk. 



A smooth form, in which the grooves are weak and few, al- 

 most wanting on the 'later whorls, was taken by Henderson 

 at Clarendon Park. The varices are marked as usual, but 

 with very narrow brown stripes. The single example seen 

 probably represents a subspecies. 



West of Ocho Rios and at Mandeville, Henderson took a 

 form with rather small aperture and unusually straight 

 columella. 



Var. biplicatula n. v. PI. 17, fig. 12. 



At Montpelier a handsome form was taken by Henderson, 

 in which the columella, in oblique view, is seen to be cal- 

 lo-used, with a loiv superior fold, wanting in typical V. similis. 

 The shell is tawny with very dark chestnut stripes, inter- 

 rupted at the lower third on the last whorl, and is very 



