38 HELIX DIALEUCA. 



New Orleans, nor has it been found at St. Thomas by modern con- 

 cholo gists. 



H. VARIEGATA Chemnitz. (Pm. Monogr. i, p. 174; Conchyl Cab. 

 p. 52, t. 6, f. 10, 11,. H. ncevia GMEL. Syxt., xiii, p. 3623.) 



This is a spurious species, which need not encumber our cata- 

 logues any longer. Chemnitz was not a binomialist in vol. ix of the 

 " Conchylien Cabinet." The species has never been identified by 

 any one that I have ever heard of. 



Section IV. DIALEUCA Albers, 1850. 



Dialeuca ALB. Die Heliceen, 1850, p. 114. Cory da ( in part ) 

 ALBERS-MARTENS, Die Heliceen 1860, p. 136. Lepioloma AL- 

 BERS-MARTENS, Die Heliceen 1860, p. 167. 



In the West Indian Helices, as in nearly every department of 

 zoology, there is a large excess of subgeneric names over the num- 

 ber of natural groups. Our course in this case is plain. We must 

 accept Dialeuca ( type, H. nemoraloides ), and reduce the later 

 name, Leptoloma, (type, H. fuscolabris Ad) to a synonym; for 

 there is absolutely no character of more than specific value to sep- 

 arate the species of the two divisions. Albers seems to have decided 

 to unite Dialeuca to Coryda, (Die Heliceen 2d ed, p. 136 ), but al- 

 though there is no difference of any importance to speak of, we may 

 as well retain the division, as it is a natural one, even though the 

 characters are trivial. 



H. CONSPERSULA Pfeiffer. PL 18, figs. 12-14. 



Imperforate, conical, thin, striate, nearly lustreless, varying in 

 color from yellowish to dark brown, with or without two dark zones 

 on the body-whorl, all over more or less densely dotted with whitish 

 flecks ; spire elevated, conical, apex obtuse, smooth, shining, the tip 

 blackish ; sutures moderately impressed; narrowly margined with a 

 deep brown line, which is usually dotted with white ; whorls 6, the 

 last depressed, wide, generally subangulate at the periphery, not de- 

 flexed anteriorly, or only slightly so; aperture quite oblique, broad, 

 peristome thin, brown, outer and basal lips slightly expanded, col- 

 iiinella nearly vertically entering, somewhat thickened; parietal 

 wall with a slight callus which extends also around the umbilical 

 tract. Alt. 16, diam. 20 mill ; Alt. 15, diuni. 23 ] mill. 



Jamaica. 



H. conspersula PFR. P. Z. S. 1845, p. 124 ; Monographia, i, p. 230; 

 Conchyl. Cab. p. 327, t. 136, f. 1, 2. PHILIPPI Abbild. ii, p. 84, t. 



