UROCOPTIS, S. G. GONGYLOSTOMA. 223 



above the middle, truncated in the single specimen known; 

 suture crenulate; remaining whorls 13, rather flattened, the 

 last carinate at the base, shortly free in front. Aperture 

 oblique, subcircular; peristome shortly expanded, subsinuate 

 anteriorly at the keel. Internal column ornamented with two 

 descending folds. Length 17.5, diam 4 mm. (Arango). 



Cuba. 



Cyl. prima ARANGO, Proc. A. N. S. Phila. 1882, p. 107 

 (June 27, 1882). 



93. U. CONFUSA (Arango). 



Shell rimate, cylindric turrete, solid, closely striate, whit- 

 ish; spire noticeably tapering above the middle, shortly trun- 

 cate; suture not crenulate; whorls remaining 13, rather flat, 

 the last carinate at the base, shortly free in front. Aperture 

 subcircular, the peristome narrowly expanded. Internal col- 

 umn provided with two strong, slowly descending lamellae, 

 the upper one stronger. Length 16, diam 4 mm. (Arango). 



Cuba. 



Cyl. confusa ARANGO, Proc. A. N. S. Phila, 1882, p. 107. 



94. U. PLANOSPIRA (Pfeiffer). PL 53, figs. 61, 62, 60. 



Shell cylindric, slowly tapering to a wide truncation above, 

 thin, pale corneous; surface glossy, very densely and finely 

 sculptured with close, nearly straight, low striae, becoming 

 rather coarse and sharp on the last half whorl. Whorls but 

 slightly convex, almost flat, the last free in front, the neck a 

 little contracted and rounded. Aperture rounded, the lip 

 expanded, reflexed and thickened. Axis bilamellate, the 

 upper lamella stout and rounded, more prominent than the 

 lower, which is compressed and slightly serrate. 



Length 15, diam. 3 mm. ; whorls 12. 



Length 12.3, diam. 2.7 mm. ; whorls 10. 



Length 15.5, diam. 3 mm.; whorls 13 (Pfr., type). 



Western Cuba: Managua, 15 miles S. by E. of Havana 

 (Poey). 



Cyl. planospira PFR., Malak. BL, ii, 1855, p. 99, pi. 5, f . 4, 5 ; 

 Conchyl. Cab., p. 24, pi. 3, f . 12-14 ; Monogr., iv, 701 ; vi, 371 ; 



