VARICELLA, JAMAICA. 81 



a few distant black-brown longitudinal lines; whorls 7 1 /2, 

 with an impressed infrasutural line, costulate, the costulae 

 very close, not much raised, and rounded. Aperture elon- 

 gate, acute above, somewhat channelled below; lip thin, an- 

 gular in the middle, strongly retracted below; columella 

 strongly twisted. Divergence 28, length of spire .46, total 

 length of shell .81, diam. .275 inch." (Ad.). 



Jamaica. 



Achatina gnffithsii C. B. A., Proc. Bost. Soc. N. H. ii, p. 

 14 (1845). REEVE, Conch. Icon. v. Achatina, pi. 15, f. 64. 

 A. griffithii, C. B. Ad., Contrib. to Conch, no. 8, p. 129 

 (1851). 



Three examples of the typical form are preserved in the 

 Amherst collection, besides a set of 5 and another of 15 speci- 

 mens representing varieties. 



The first half whorl is smooth; the following whorl is 

 coarsely costulate, and the next whorl more finely so. The 

 nepiondc stage terminates at 2% whorls, but the neanic scuip- 

 ure is similar to the preceding whorl. On the last whor? 

 the riblets are fine, rounded and -close, equal to the intervals, 

 seven in a mm. (fig. 7). There are generally three varices 

 on the last whorl, the last two projecting a little. They are 

 preceded by narrow brown streaks which are interrupted at 

 the periphery and very narrow below it. The last half of 

 the last whorl is constricted in the middle, the rib-striae 

 waving forward there. The lip projects angularly and is 

 thickened in the middle, excised and receding below the angle. 

 The columella is very strongly twisted, as in V. procera. 



Var. chittyi, n. v. PL 7 figs. 8, 9. 



Somewhat larger than V. griffithii, with coarser striation, 

 about 4!/2 to 5 striae in a mm. on the last whorl; riblets of 

 second whorl coarser. Lip generally not so strongly angu- 

 lar, and the columella is less contorted. Whitish corneous, 

 with somewhat bolder stripes than typical griffithii. Length 

 23.7, diam. 8, aperture 10.5 mm., whorls 8%. 



Jamaica, type no. 2915 coll. A. N. S. Specimens were 

 taken by Mr. Henderson at Mulgrave and Montpelier. A 



