270 UROCOPTIS, S. G. GONGYLOSTOMA. 



mm., with 12 to 15 whorls in truncate, 18 to 

 19 in entire shells. U. philippiana, no. 162. 



/. Lamella-ribbed, lustreless, with very convex 

 whorls; 12.3x2.2 mm., with 17 whorls, to 

 8.7 x 1.7 mm., with 15 whorls. 



U. plicata, no. 163. 



g. Fusiform, lustreless, with strongly elevated, 

 subvertical lamellae ; 9 to 10 x 2.2 mm., with 

 10 whorls in truncate to 17 in entire speci- 

 mens. U. scalarina, no. 164. 



h. Ribbed ; New Providence, Bahamas. 



U. bahamensis, no. 165. 



152. U. GRACILLIMA (Poey). PI. 62, figs. 41, 42. 



Shell cylindric-suhulatQ, very slender, the upper third 

 tapering, attenuate, the apex truncate ; thin, corneous clouded 

 with white, but usually appearing tawny from adherent soil. 

 Surface lustreless, under a lens seen to be obliquely weakly 

 costulate above and on the last two whorls, the intermediate 

 whorls nearly smooth. Whorls nearly flat, the last descend- 

 ing and projecting in a long free neck, which is sculptured 

 with' narrow, widely spaced riblets. Aperture oblique, cir- 

 cular, the peristome free, wide and flatly reflexed. Axis 

 slender, slightly sinuous within each whorl (pi. 64, fig. 13). 



Length 21, diam. 2 mm.; whorls 26 (apex truncate). 



Length 28, diam. 2 mm. ; whorls 28-30, of which 8 or 9 are 

 generally deciduous (Poey). 



Western Cuba: San Jose de las Lajas (Don Ignacio Her- 

 nandez) . 



Cyl. gracillima POEY, Memorias, i, pp. 202, 211, pi. 12, 

 f. 1-3 (May, 1853, t. c., p. 449). PFR., Monogr., iii, p. 576; 

 iv, 707; vi, 385; Malak. Bl., 1854, p. 212; Conchyl. Cab., 

 p. 54, pi. 6, f. 4-6. ARANGO, Contrib., p. 125. SOWERBY, 

 C. Icon., xx, pi. 15, f. 130. 



This very slender species resembles U. cydostoma Pfr., 

 but differs by its nearly smooth surface, only the neck being 

 strongly costulate. 



