106 HELIX-LUCERNA. 



Var. FUSCOLABBIS C. B. Adams. PL 30, figs. 50, 51. 



Umbilicate or imperforate ; carina bordered beneath with dark,, 

 base paler toward the middle ; aperture and peristome brown. 



Alt. 16, diam. 36 mill. 



H. RHYNCH.ENA A. D. Brown. 



Imperforate, depressed-conical above, convex beneath, carinated,. 

 solid, subfulvous, obsoletely granulose ; whorls 5, nearly flat, the 

 last inflated, excavated above the carina ; aperture very oblique, 

 angular below, produced into a rostrum above, armed with a small 

 tooth at the carina ; peristome isabella-colored, broadly reflexed, 

 margins joined by a thin callus, basal margin thickened. 



Alt. 20, diam. maj. 52, min. 43 mill. (A. D. B.} 



Jamaica* 



H. rhynchcena BROWN, in Journ. de Conchyl. 1870, p. 392. 



This is evidently a form allied to some of the varieties of H. acuta.. 

 Mr. Brown seems to have abandoned the name ; for in his collection 

 there are no specimens not even the type marked rhynchcena. 



*** 



H. PERACUTISSIMA C. B. Adams. PI. 27, figs. 70, 71 



Perforate or covered, depressed, thin but strong, opaque, slightly 

 shining, chestnut-brown, uuicolored, obliquely irregularly striated, 

 minutely granulated all over, the granulation sometimes nearly 

 effaced ; spire low-conoid or flattened ; apex planulate ; sutures 

 linear or projecting instead of impressed ; whorls 4J to 5, slowly 

 increasing, the last generally narrower toward the aperture, very 

 acutely carinated, convex beneath, not descending anteriorly ; aper- 

 ture oblique, subtriangular ; peristome expanded, brown, bearing 

 inside the lower margin four teeth ; a small one near the insertion, 

 then a larger on the basal margin, then two near together, and 

 situated upon a common eminence, toward the outer angle of 

 aperture. The whorl is deeply tri-scrobiculate behind the peristome. 



Alt. 15, diam. 42 mill. 



Jamaica* 



H. peracutissima AD., Proc. Bost. Soc. N. H. 1845, p. 15. PFR.,. 

 Monographia, i, p. 314; Conchyl. Cab. p. 300, t. 126, f, 9, 10.- 

 REEVE, f. 224. H. straminea ALBERS, Die Heliceen, p. 122. H. 

 soror var, FER., Hist. t. 54 A, f. 1-3. H. martiniana PFR. Monogr. 

 i, p. 314; Conchyl. Cab. p. 264, t. 120, f. 9-11. 



