40 HELIX 



little impressed ; last whorl much advanced above over the aperture 

 which is suborbicular ; lip very thin and sharp, except the columel- 

 lar portion, which is much thickened and expanded, of a pink color, 

 coalescing with the outer lip in a curve. (Adams.^) 



Jamaica. 



H. SUBCONICA C. B. Adams. PL 18, figs. 15, 19 ; pi. 20, fig. 79. 

 Imperforate, yellowish, depressed conoidal, thin, subtranslucent, 

 irregularly striate, marked with narrow pheripheral and subsutural 

 bands, and a circular chestnut tract around the axis, surrounded by 

 a lighter zone ; frequently longitudinally streaked with chestnut ; 

 spire low-conic ; apex corneous or dark ; whorls 5, slightly convex, 

 regularly increasing, the last depressed, subangular at the periphery, 

 a mere trifle descending anteriorly ; aperture transverse, wide, 

 oblique ; peristome thin, white, outer and basal margins expanded 

 somewhat ; columella reflexed, white ; parietal callus transparent, 

 very thin. Alt. 14, diam. 21 ; Alt. 15, diam. 18; Alt. 12J diam. 

 19 mill. Jamaica. 



H. subconica C. B. Ad. Proc. Bost. Soc. N. H. 1845, p. 15. PFR. 

 Monogr. i, p. 30 ; Conchy I. Cab. t. 108, f. 15-16. REEVE, Conch. 

 Icon., f. 284. H. gossei PER. P. Z. S. 1846, p. 37 ; Monographia i, 

 p. 30; Conchyl. Cab. t. 108, f. 16. (not of Adams.) 



A darker form than that described above is figured on pi. 18, fig. 

 19. There is besides a smaller form, light corneous or yellowish in 

 color, with very narrow bands, sometimes unicolored, very thin. 



Alt. 11-12, diam. 15-16 mill. 



H. NEMORALOIDES C. B. Adams. PI. 14, figs. 96-98. 



Resembles H. subconica, but is more solid, more compact, more 

 opaque, and has more numerous bands. 



Imperforate, depressed-conoidal, rather solid, slightly shining, 

 opaque, white or slightly suffused with brownish, generally more or 

 less streaked longitudinally with light chestnut, and encircled by 

 deep brown or blackish bands, generally three in number, in ad- 

 dition to a subsutural brown line and a circular axial patch ; spire 

 conical, low, apex obtuse, dark ; sutures but slightly impressed ; 

 whorls 5, the last rounded at the periphery, briefly but obviously de- 

 scending anteriorlij ; aperture broad, transverse, oblique; peristome 

 thin, outer lip slightly expanded, columellar margin oblique, rather 

 wide, flat, appressed at the umbilical region. 



Alt. 11-13, diiiin. 17-19 mill. Jamaica. 



