130 UROCOPTIS OF JAMAICA. 



the width of the riblets. They are white, with the basal keel 

 very weak in some shells, but rather strong in others. Speci- 

 mens measure : 



Length 21, diam. 6 mm. ; whorls 8. 



Length 18, diam. 6 mm. ; whorls 7. 



Length 18%, diam. 6.2 mm. ; whorls 7%. 



11. U. ASPERA (C. B. Adams). PI. 29, figs. 38-41; pi. 32, 

 fig. 85. 



Shell shortly rimate, oblong-cylindric, strongly tapering 

 above, the truncation quite small; solid and strong, dull red 

 or flesh-colored, usually paler on the lower whorls, the last 

 one sometimes nearly white. Surface lustreless, sculptured 

 with sharp narrow, arcuate stria, more widely spaced than 

 usual in allied species. Whorls typically 9 to 10, somewhat 

 convex, the last tapering downwards, obtusely subangular 

 around the axis, and encircled by a distinct or weak cord-like 

 carina, becoming free in front. Aperture whitish within; 

 peristome free and entire, broadly expanded and reflexed, 

 the upper margin noticeably straightened, elsewhere rounded. 

 Internal axis slender and straight. 



Length 23.5, diam. 7.5 mm. (Adams' type). 



Length 25, diam. 7.7 to 8.2 mm. ; whorls 10. Yallahs R. 



Length 20, diam. 7.2 mm. ; whorls 9. Yallahs R. 



Length 22, diam. 7.2 mm. ; whorls 9y 2 . Yallahs R. 



Length 19, diam. 6.3 mm. ; whorls 9~y 2 . Creighton Hall. 



Length 21.5, diam. 7.2 mm.; whorls 9y 2 . Creighton Hall, 



Length 19, diam. 7 mm. ; whorls 8%. Greenhall. 



Jamaica: Yallahs River (Henderson), Greenhall and 

 Creighton Hall (Jarvis), St. Thomas, from the coast to 1800 

 ft. elevation. Map no. 2, area 2. 



Cylindrella aspera C. B. A., Contrib. to Conch., no. 2, p. 21 

 (Oct., 1849). PFR., Monogr., iii, p. 564; Conchyl. Cab., p. 13, 

 pi. 2, f. 18, 19. HENDERSON, Nautilus, viii, p. 19 (June, 1894). 

 SOWB., C. Icon., xx, pi. 1, f. 1. 



Probably Yallahs River (figs. 38, 39, 85) was the type lo- 

 cality, as specimens from that place agree perfectly with the 

 original description. Those from Greenhall (figs. 40, 41) are 



