64 HELIX THELIDOMUS. 



good reason for separating provisoria from Ferussac's species. I con- 

 sider it a mere variety, at most. 



H. EMARGINATA Gundlach. PL 1, fig. 14 ; pi. 3, figs 17, 19. 



Imperforate, small, solid, globose-conoid, shining, light olive- 

 brown or yellowish-brown, strongly obliquely plicatulate-striate, 

 interstices between the striae smooth or a little wrinkled transversely, 

 base smoother; spire conoid, short, the apex obtuse, smooth, white, 

 sutures impressed ; whorls 4, moderately convex, the last globose, 

 tumid beneath, abruptly, deeply deflected toward the aperture ; aper- 

 ture contracted, very oblique, small, subtriangular-lunar ; peristome 

 contracted, thickened, narrow, baso-columellar margin straightened, 

 bearing in the middle a strong tubercular tooth. 



Alt. 15-18, diarn. 20 mill. 



Guantanamo, Eastern Cuba. 



H. emarginata GUNDL. Mss ; PFR., Malak. BL 1859, p. 86-Novit. 

 Conch., p. 182, t. 49, f. 4, 5. ARANGO, Fauna Mai Citbana, p. 72. 



This small, globose shell may be known from all others by the 

 contracted aperture, and the tooth in the middle of the basal margin 

 of the aperture. The form is but slightly dilated transversely. 



H. BAYAMENSIS Pfeiffer. PI. 2, figs. 1-3. 



Imperforate, depressed-globose, moderately solid, slightly lustrous 

 above, shining beneath, clear straw-colored, above more or less deep- 

 ly tinged with russet but without darker oblique streaks, or with a 

 few very ill-defined ones ; upper surface costulate-striate, the costulse 

 moderately regular, smooth, and (comparatively) rarely bifurcating ; 

 upon the periphery they become obsolete, leaving the base smooth 

 and glossy ; spire short, low-conical, apex flattened, first H whorls 

 glossy ; whorls 4, a little convex, rapidly widening, the last trans- 

 versely dilated, rounded, rather abruptly deflected to the aperture ; 

 aperture extremely oblique, subtriangular-lunar ; peristome a trifle 

 expanded, thickened within, heavy, its upper margin decidedly arch- 

 ed, almost subangular sometimes, the baso-columellar margin forming 

 an angle where it joins the outer lip, straight, its inner edge bearing 

 a slightly developed projection of callus near the insertion, never 

 toothed or truncate at the base, 



Alt. 23, diam. maj. 34, min. 26 mill. 



Bayamo, Guantanamo, Santiago de Cuba, etc., in Eastern Cuba. 

 H. bayamensis PFR., Malak BL, 1854, p. 189, t. 2, f. 4-6. H. nos- 

 dbilisf PFR., in Conchy I. Cab., p. 252, t, 114, f, 10, 11, 



