HELIX DIALEUCA. 39 



7, f. 4. REEVE, Conch. Icon. f. 433. H. fuscocincta C. B. Ad. 

 Contr. to Conch, iii, p. 34, (1850 ) PFR. in Conchyl Cab. p. 218 t. 

 108, f. 11, 12 ; Monogr. i, p. 30. REEVE, Conch. Icon. f. 291. IT. 

 virginea C. B. Ad., Contr. to Conch, iii, p. 33. PFR. Monogr. iii, p. 

 149. H.platystyla PFR. P. Z. S. 1849, p. 130; Monogr. iii, p. 174. 

 -REEVE Conch. Icon. f. 487. BLAND, Ann. Lye. Nat. Hist. N. Y., 

 xi, p. 82. 



So great is the variation shown by the numerous specimens of 

 Leptoloma before me that I do not hesitate to unite under the old- 

 est name most of the described species. I have seen creamy-white 

 examples of conspersula, without markings. 



Restricting typical H. CONSPERSULA to shells of light texture and 

 color, not prominently banded but conspicuously dotted with whit- 

 ish, the spire only moderately elevated, we may define the following 

 divergencies from this type, ranking them as varieties. 



VAR. FUSCOCINCTA C. B. Ad. PI. 18, figs. 4-6. 



Spire more elevated, elate-conic ; striatulate or densely, finely 

 costulate-striate ; the base, a supra-peripheral zone and a subsutural - 

 line dark ; whorls of the spire with a median dark band ; white 

 flecks few or none. 

 L Alt. 23, diam. 19-22. mill.; Alt. 19, diam. 22 mill. 



Jamaica. 



VAR. PLATYSTYLA PFR. PL 18, figs. 3, 7. 



Form the same as typical conspersula ; body-whorl inclined to be 

 angular at the periphery ; surface striate, somewhat shining ; thicker, 

 solider, than the preceding forms, with a bright white lining in- 

 side ; spiral bands obsolete except the subsutural marginal line ; 

 color yellowish, more or less strigate obliquely with light chestnut ; 

 lip brown-edged ; columella pinkish-brown, umbilical tract covered 

 with a brown or violet callus. 



Alt 19, diam. 22 mill. Alt, 19, diam. 24 mill. 



Jamaica. 



VAR. VIRGINEA C. B. Ad. 



Conic ; pale brown, with the upper whorls and a zone on the peri- 

 phery horn-colored, with narrow portions of epidermis scattered 

 somewhat in zigzag, which are white and hydrophanous ; with fine 

 striae of growth ; spire elevated, with nearly rectlinear outlines ; spire 

 rather obtuse ; whorls nearly 6, a little convex, with the suture but 



