UROCOPTIS, S. G. GONGYLOSTOMA. 257 



Differs from U. Shuttleworthiana chiefly by its greater 

 solidity, lighter fleshy color, and the dark interior of the 

 mouth. The specimens from Banos de San Vicente, near 

 Vinales, are somewhat more slender than those from Vinales, 

 measuring, length 23.5, diam. 5 mm., with 10% whorls. 



138. U. ABDITA (Arango). 



Shell shortly rimate, swollen-cylindric, rather solid; black- 

 brown, with compressed, whitish, nearly straight and remote 

 ribs. Spire perceptibly tapering from the middle, truncate; 

 whorls remaining 9 to 10, a little convex, the last shortly free, 

 with the ribs scarcely closer, the base subcarinate. Aperture 

 slightly oblique, subcircular; columella a little plicate, the 

 peristome expanded. Internal column three-lamellate. 

 Length 17, diam. 4.5; diam. of apert. 1.75 mm. (Arango). 



Western Cuba : Hato de Morales, in Pinar del Rio. 



Cyl. abdita ARANGO, Contrib., p. 276 (1880). 



Similar to C. vignalensis, but it differs in form, color and 

 the remote ribs (Arango}. 



139. U. TRILAMELLATA (Pfeiffer). PL 46, figs. 71, 72, 73, 74. 

 Shell slender, cylindrical, the upper whorls tapering 



slightly to the wide truncation; dull purplish, fading above. 

 Surface lustreless, sculptured with strong, whitish, thread- 

 like, slightly oblique and arcuate rib-striae, separated by 

 intervals of more than double their own width. Whorls 

 convex, the last shortly free in front, rounded below, with 

 the slightest trace of a basal keel. Aperture subcircular, 

 a trifle longer than wide, dark purple-brown within. Peri- 

 stome white, narrowly expanded; columella with a distinct 

 fold within. Axis encircled by three lamellae, fhe upper one 

 very small, the lower stronger, denticulate, extending nearly 

 to the aperture, the others disappearing in the penult, whorl. 



Length 19.5, diam. 3.4 mm. ; whorls 11. 



Length 17.5, diam. 3.8 mm. ; whorls 9. 



Length 19-20, diam. 4 mm.; whorls 12 (Pfr.). 



Western Cuba : Guira de Luis Lazo, in the jurisdiction of 

 lar del Rio (Chas. Wright). 



