8 HELIX. 



columella somewhat straightly descending, twisted, thickened, 

 aperture wide, with a strong basal lamella. Diam. 16 mill. 



Jamaica. 

 H. PILA, C. B. Adams. PL 1, fig. 14. 



Imperforate, thin, smooth (very minutely lightly decussated), 

 diaphanous, whitish, suture deep ; whorls 6^, convex, the last 

 globose, base not impressed ; columella short, subvertical, den- 

 tately dilated ; aperture widely lunar, with an acute elevated 

 lamella below the middle of the base. Diam. 12 mill. 



Jamaica. 



H. LAMELLIFERA, C. B. Ad. PL 1, fig. 15. 



Imperforate, striated, the yellowish corneous epidermis sub- 

 pustulose ; whorls 5J-6, a little convex, moderately increasing, 

 the last more convex, with scarcely impressed base ; columella 

 oblique, callously thickened, aperture obliquely lunar, base with 

 a median lamella, evanescent in front. Diam. 10 mill. 



Jamaica. 

 H. BLANDTI, Weinland. PL 1, figs. 16, IT. 



Very narrowly umbilicated, rather thin, scarcely striulate, 

 whitish ; whorls 6, narrow, very slowly increasing, the last a 

 little compressed on the sides, base convex, a little excavated in 

 the middle ; aperture vertical, widely lunar, with an interrupted 

 or continuous spiral basal lamina, and nodular columella. 



Diam. 4 mill. Port au Prince, Haiti. 



Section HYALOSAGDA, Albers, 1860. 



H. OSCULANS, C. B. Ad. PL 1, figs. 18, 19. 



Imperforate, depressed, thin, striulate, shining, pellucid, 

 hyaline-white ; spire very short, convex, suture smooth, sub- 

 margined ; whorls 6-J, scarcely convex, base subexcavated ; 

 aperture obliquely lunar, columellar margin subcallous, nearly 

 horizontal, basal lamella strong, conspicuous. Diam. 13 mill. 



Jamaica. 

 Yar. DELAMINATA, Adams MS. The lamella absent. 



H. HALDEMANIANA, C. B. Adams. PL 1, figs. 20-22. 



Imperforate, striulate, thin, shining, pale greenish or corneous, 

 hyaline, spire very obtuse, suture margined; whorls T, scarcely 

 convex, base deeply excavated in the middle. Diam. 13 mill. 



Jamaica. 

 H. arboreoides, Adams, is a synonym. 



