UROCOPTIS, S. G. GONGYLOSTOMA. 271 



153. U. CYCLOSTOMA (Pfeiffer). PL 62, figs. 38, 39, 40. 

 Shell cylindric-subulate or fusiform-subulate, attenuate 



above, the apex entire and bulging, or narrowly truncate; 

 thin ; corneous, usually with a rusty extraneous coat. Surface 

 lustreless, sculptured with narrow, oblique, thread-like rib- 

 lets, parted ~by spaces four or five times their width. Whorls 

 slightly convex, <he last descending and projecting in a rather 

 long neck. Aperture oblique, circular, the peristome white, 

 expanded and flatly reflexed. Axis rather stout for so slender 

 a shell, cylindrical. 



Length 19.5, diam. 1.8 mm.; whorls 29 (apex entire). 



Length 18.6, diam. 1.6 mm.; whorls 20 1 /2 (truncate). 



Length 20, diam. 2 mm. ; whorls 26-29 (Pfr.). 



Western Cuba: Lomas de Camoa (Gundlach) ; Cuevas de 

 Cotilla (Arango). 



Cyl. cydostoma PFR., Malak. BL, ii, 1855, p. 100, pi. 5, 

 f . 6, 7 ; Conchyl. Cab., p. 54, pi. 6, f . 7-9 ; Monogr., iv, p. 708. 

 ARANGO, Contrib., p. 125. GUNDLACH, Malak. BL, iv, 1857, 

 p. 47. W. G. BINNEY, Ann. N. Y. Acad. Sci., iii, p. 125 

 (teeth). 



Near U. gracillima, but more strongly sculptured, with the 

 whorls somewhat more convex, and the spire more tapering. 

 Binney found the tooth-formula to be 8.2.1.2.8. In the radula 

 I examined there are 5.2.1.2.5 teeth (pi. 43, fig. 3, 6th lateral 

 in profile) , the inner two laterals equal and much larger than 

 the others. 



154. U. ISCHNA Pilsbry, n. sp. PL 64, figs. 9, 10, 11. 



Shell cylindric-tapering, very slender, the summit narrowly 

 truncate; thin; brownish-corneous, sparsely and indistinctly 

 marbled with whitish, or whitish with some brown markings. 

 Surface slightly shining, smooth, or with some weak striation. 

 Whorls convex, the last descending in a rather long round 

 neck. Aperture circular, oblique, the peristome white and 

 well expanded. Axis slender and straight, encircled by two 

 low spirals (fig. 10). 



Length 21, diam. 1.9 mm. ; whorls 25%. 



Length 17.5, diam. 2 mm. ; whorls 17. 



