HELIX-LUCERNA. 101 



margin simple, obtuse, outer slightly expanded, basal margin 

 reflexed and adnate for a considerable distance to the base ; bearing 

 within two small, somewhat-compressed teeth. 



Alt. 25, diam. 45 mill. 



Jamaica. 



H. subacuta PFR. Malak. Bl. 1867, p. 127 ; Monographia v, p. 

 318. 



This is rather a rare species, heretofore unfigured. It is similar 

 to H. carmelita in being granular above, smoother and polished 

 beneath, but differs from that form in having teeth on the basal lip. 

 From H. bainbridgei, lucerna, acuta, chemnitziana, spengleriana, 

 etc., it is separated by the close adhesion and appression of the basal 

 lip to the body-whorl nearly as far as the outer tooth of the basal 

 margin. 



H. ACUTA Lamarck. 



Under the above name I include a number of forms of Jamaica 

 Helices which authors have attempted to establish as distinct 

 species. I unite these forms only after the closest study of hundreds 

 of specimens, and because absolute inosculation of the several 

 supposed specific types is exemplified by numerous specimens 

 before me. The descriptions below apply to typical examples of the 

 varieties ; but as I have just said, intermediate forms connecting 

 these in every direction may be expected by the student. 



H. ACUTA var. ACUTA Lam. PL 26, fig. 61. 



Imperforate, depressed, very acutely carinated, solid, opaque, 

 nearly lusterless, yellowish-brown or chestnut, finely granulate all 

 over ; spire more or less depressed, very low-conical, obtuse ; apex 

 planulate; suture linear; whorls 5 to 5, flat, slowly widening; 

 body-whorl acutely carinated at the periphery, concave above, con- 

 vex below the carina ; base convex, constricted behind the peristome ; 

 aperture transverse, white or pinkish within ; peristome white or 

 brown, slightly expanded and obtuse above, broadly expanded be- 

 low, thickened, bearing inside two rather strong, acute teeth, the 

 outer one usually marked behind the peristome by a slight depres- 

 sion. Alt. 25, diam. 50 mill. 



Jamaica. 



H. acuta LAM. in Encyc. Meth. t. 462, f. 1. Caracolla acutissima 

 LAM. An. s. Vert, vi, pt. 2, p. 95. H. lamarckii var. DESK, in Fer 

 Hist., t. 57, f. 2, 3. H. acutissima DESK., Encyc. Meth. ii, p. 261, 



