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. griffithii, with some- 

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

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

 mm., whorls O 1 /^. 



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 striaa; 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. 



Achtit-ina ligata C. B. A., Contrib. 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, 



