UROCOPTIS, S. G. GONGYLOSTOMA. 261 



vertical stripes. Surface somewhat glossy, arcuately striate, 

 the striae not half as wide as the intervals. Whorls but 

 slightly convex, the suture seam-like; last whorl free in 

 front, descending, carinate beneath. Aperture oblique, wide- 

 ovate, brown inside, the whitish lip expanded, acute. Axis 

 bearing two equally prominent lamellae, the lower one com- 

 pressed and minutely denticulate, the upper rather stout and 

 cord-like in the last few whorls, becoming slender above. 



Length 24.5, diam. 4.3 mm.; whorls 12. 



Length 20.5, diam. 3.2 mm. ; whorls 12y 2 . 



Length 27, diam. 4.2 mm. ; whorls 13. 



Isle of Pines, in the mountains (Morelet, Gnndlach). 



Cyl. pruinosa MOREL., Testacea Noviss., i, p. 11, no. 14 

 (1849). DESH. in Fer., Hist., ii, p. 228, pi. 164, f. 19-22. 

 BLAND, Ann. Lye. Nat. Hist, of N. Y., vi, p. 151, pi. 5, f. 17 

 (axis). PFR., Monogr., iii, p. 571; iv, 700; vi, 370; Conchyl. 

 Cab., p. 39, pi. 4, f. 37-39. SOWERBY, C. Icon., xx, pi. 4, 

 1 31. ARANGO, Contrib., p. 112. 



Very distinct by its coloration of white and dark stripes, 

 with more or less white frosted over a light purplish-brown 

 ground-color, somewhat like the bloom on a plum; hence the 

 specific name. The basal keel is also a very unusual char- 

 acter in Gongylostoma. 



Group of U. ventricosa. 



Rather short, cylindric or oblong, copiously variegated 

 with white on a corneous ground, nearly smooth, the suture 

 not crenate, the last whorl very shortly free. Axis stout, 

 with a sub-basal denticulate spiral lamella and a low more 

 oblique cord above it. 



Differs from the group of U. coerulans by its stout axis 

 and plain suture. The single species is from eastern Cuba. 



145. U. VENTRICOSA (' Gundl. ' Pfr.). PL 58, figs. 56, 59, 60. 



Shell shortly rimate, swollen-cylindric, smooth, beautifully 



variegated with milk-white and corneous flames. Spire long, 



more or less swollen, tapering above, truncate. Whorls re- 



