82 VARICELLA, JAMAICA. 



series of 15 is in the Adams collection at Amherst, and sev- 

 eral other lots without exact locality are 'before me. 



Var. ischna n. v. PL 7, figs. 10, 11, 12, 13. 



More slender and lengthened than V. griffitliii, with some- 

 what coarser striation, 5 or 6 striae in a mm. on the last 

 whorl, and more whorls. Length 21.2, diam. 6, aperture 9 

 Trim., whorls 9y 2 . 



Jamaica, type no. 2914 A. .N. S. Specimens from Mt. 

 Diablo, in coll. Henderson, are less slender, length 22, diam. 

 7, aperture 9.8 mm. (fig. 13) . Similar shells were taken by 

 him at Bog Walk. This variety is also represented in the 

 Adams collection. A specimen was figured for V. ligata in 

 Vol. I, pi. 3, f . 7. 



28. V. LIGATA (C. B. Adams). PL 11, figs. 57, 58. 



"Shell elongate, subconic, with a broad deep constriction 

 around the middle of the last whorl; pale brown, with dark 

 brown narrow transverse stripes, which are sometimes nearly 

 obsolete, of which there are about three on each whorl, ex- 

 cept on the first three or four, which have none; varicate at 

 the last one or two brown stripes, with rather fine crowded 

 transverse striae; spire with the outlines moderately convex; 

 apex small; whorls about seven and one half, a little convex 

 with a well impressed suture; aperture long, much modified 

 by the intrusion of the labrum at the constriction of the last 

 whorl; labrum thickened at the constriction; columella a 

 little twisted and arcuated. Mean divergence 24 ; length 

 .68 inch; breadth .195 inch; length of aperture .26 inch." 

 ( Adams) . 



Jamaica. 



Achatina ligata C. B. A., Oontrib. to Conch, no. 2, p. 25 

 (Oct. 1849). 



The Adams collection contains a lot of ten specimens, of 

 which three are young. There are two varieties represented, 

 a more slender (typical) and a larger, stouter form. A 

 specimen agreeing so closely with the original measurements 

 that it must be the type, is figured, pi. 11, fig. 58 ; length 17, 



