UROCOPTIS, S. G. GONGYLOSTOMA. 249 



streaks, the suture bordered below with a regular row of 

 white beads. Surface glossy, closely and regularly striate. 

 Whorls convex, the last produced in a neck which is white 

 above, shorter and less descending than in U. hidalgoi. No. 

 basal keel. Aperture subcircular, brownish inside, the peri- 

 stome thin, white, and expanded. Axis slender, straight, 

 encircled by a single sub-basal, rather remotely dentate 

 lamella. 



Length 12, diam. 2.7 mm. ; whorls 8%. 



Length 11, diam. 2.5 mm. ; whorls 8%. 



Western Cuba: Pinar del Bio (Wright). 



This species belongs to the group of U. hidalgoi, differing 

 from that form in sculpture, the single axial lamella and the 

 shorter neck. It is larger than U. gonzalezi, and more finely 

 sculptured. A small group of closely related forms consists 

 of the species joaquini, gonzalezi, hidalgoi and unguiculata. 

 The types of this species were found among specimens of 

 U. affinis collected by Wright. 



129. U. UNGUICULATA ( Arango) . PI. 57, fig. 52. 



Shell turreted, slowly tapering from the last whorl to the 

 wide truncation, brownish-corneous variegated with white. 

 Surface glossy, sculptured with a few irregularly and widely 

 spaced riblets, the latter half of the last whorl ribbed. Su- 

 ture crenate, the subsutural nodules hook-shaped, the acumi- 

 nate upper end of each reaching up and forward. Last 

 whorl very shortly free, having a low keel beneath. Aper- 

 ture subcircular, the lip reflexed. Axis having a compressed, 

 sub-basal lamella, and an indistinctly spiral cord above it. 



Length 11, diam. 3 mm. ; whorls Sy 2 . 



Length 9%-10, diam. 2y 2 mm.; whorls 7-8 (Arango, types). 



Western Cuba: Around the town of Pinar del Rio 

 (Arango). 



Cyl. unguiculata ARANGO, Contrib., p. 277 (1880). 



Somewhat intermediate between U. hidalgoi and the species 

 grouping around U. discors; but the bent or hooked sutural 

 nodes distinguish it, though they are far from conspicuous. 

 Figured from a cotype. 



