36 HELIX HEMITROCHUS. 



striate, pale corneous, with two narrow deep brown bands around 

 the periphery, bounding a median corneous or whitish zone, and 

 sometimes a wider, fainter brown band on the middle of the upper 

 surface; spire low-conoidal, apex slightly obtuse, minute, smooth, 

 light corneous ; sutures moderately impressed ; whorls 4i, moderate- 

 ly widening, the last rapidly widening, depressed, rounded at the 

 periphery, deflexed anteriorly ; aperture very oblique, transverse- 

 oval, somewhat truncated by the parietal wall ; peristome thin, slight- 

 ly expanded, the columellar margin white, much dilated above, a 

 triangular reflection partially concealing the umbilicus. 

 Alt. 9, diam. 15 mill. ; alt. 10, diam. 14 mill. 



Nuevitas and Punta de Maisi, Cuba. 



H. amplecta GUNDL. in PFR., Mai. Bl 1860, p. 17 ; 1866, p. 56 ; 

 Monogr. v, p. 349. 



Sometimes all color-markings except a single brown peripheral 

 line are absent. The aperture is very wide, transverse-oval; and 

 the general aspect of the shell is quite different from that of the 

 group of H. gilva, etc. 



H. EUFOAPICATA Poey. PI. 20, figs. 67, 68. 



Openly umbilicate, depressed, thin but rather solid, densely 

 striate, but smoother than the preceding species, light liver-color- 

 ed, with a white zone below the suture and another at the periphery, 

 the latter bordered on each side by deep-brown lines ; apex reddish ; 

 whorls 4i, the last wide, deflexed anteriorly ; aperture oblique, trans- 

 verse-oval ; peristome slightly labiate with brownish within, margins 

 converging, outer and basal margins slightly expanded, columellar 

 margin dilated partly over the umbilicus, brownish; umbilicus ex- 

 panded, grooved or rugose within. Alt. 9-10, diam. 13-15 mill. 



Holguin and Jibara, Eastern Cuba. 



If. rufoapicata POEY, Memorias ii, p. 29. PER. Monogr. iv, p. 

 266. H. gilva var. PFR. olim, and KEEVE, f. 252a. 



This shell is more solid than H. amplecta, and the color bands are 

 clear and well-defined. 



H. GRAMINICOLA C. B. Adams. PI. 32, figs. 36-38. 



This form is intermediate between H. amplecta and H. rufo- 

 apicata. The sculpture and coloration are the same as in the latter 

 species, except that the white peripheral zone is margined by a dark 

 line only upon the upper side, the subsutural white band is narrow- 



