HELIX DIALEUCA. 41 



H. nemorloides C. B. Acl. Proc. Bost. Soc. N. H. 1845, p. 15. 

 PFR. Zeitchr f. Mai. 1845, p. 155 ; Conchyl Cab. p. 218, t. 108, f. 5, 

 6 ; Monogr. i, p. 230. REEVE, f. 273. H. gossei C. B. Ad. (in 

 sched. Mus. Cuming) PER. in Conchyl. Cab. p. 220, t. 108, f. 19, 

 20 ; Monogr. iii, p, 176. REEVE, Conch. Icon. f. 288. H. pulchrior 

 C. B. Ad., Contr. to Conch, no. 9, p. 172 (1851). 



The extensive suite before me proves conclusively the specific 

 identity of the forms I have included in the synonymy. 



The above description applies more especially to the variety 

 known as H. gossei Ad. (pi. 18, figs. 9-11). The H. pulchrior Ad. 

 (pi. 18, fig. 8,) is a variety with numerous longitudinal chestnut- 

 brown streaks. 



Typical H. nemoraloides may be separated from the color- variety 

 gossei, by its whiter surface, with very distinct, dark or blackish 

 bands, generally narrow, and three in number. There is no umbil- 

 ical dark patch (and by this character alone, true nemoraloides may 

 always be known ). The three zones are sometimes confluent into 

 one or two. The whole surface is sometimes faintly suffused with 

 brownish or yellowish, but never longitudinally streaked. 



H. JACOBENSIS C. B. Adams. 



Depressed conical, transversely ovate ; yellowish horn color, with 

 very fine, well-impressed crowded striae of growth ; spire with the 

 outlines but little convex ; whorls 4 to 5, a little convex with a 

 moderately impressed suture; last whorl sub-angular; aperture 

 transversely ovate, laterally dilated; lip but little reflected and 

 thickened except in the columellar part, which is well thickened, 

 reflected and appressed ; umbilicus wanting. In form this shell 

 most resembles a very depressed H. fuscocincta, but is much more di- 

 lated laterally near the aperture. ( C. B. Ad..) 



% Alt. 15, diam. maj.23-] rain. 16 mill. 



St. James Parish, Jamaica. 



H. Jacobensis C. B. Ad. Contr. to Conch, no. 9, p. 172 (1851.) 

 PER. Monogr. iii, p. 176. 



I know this species only by the above description. 



H. BLANDIANA C. B. Adams. PI. 18, fig. 18 ; pi. 32, figs. 45-47. 



Imperforate, depressed, rather thin, shining, somewhat translucent, 

 densely, regularly, finely costulate-striate ; color pale corneous, 

 streaked obliquely with light chestnut ; spire low-conical, apex red- 

 dish, minute, obtuse ; suture moderately impressed ; whorls 5, very 



