UROCOPTIS, S. G. GONGYLOSTOMA. 247 



2. Sculptured with spaced rib-striae. 



a. Length 10.4 to 13, diam. 3.5 to 3.7 mm. ; whorls 



1^/2 to 9 l / 3 . U. d. lagunillensis, no. 130a. 



&. More slender, with more whorls; length 12.2 



to 15.5, diam. 2.7 to 3 mm. ; whorls 10y 2 to 12. 



U. diaphana, no. 131. 

 III. Axis with two subequal lamellte. 



1. Slender, length 12 to 16, diarn. 2.7 mm. ; smooth or 

 sparsely, irregularly ribbed, the long, descending 

 neck ribbed; suture sparsely white-beaded. 



U. hidalgoi, no. 126. 



2. Length 12, diam. 3.5 mm. ; whorls 10-11 ; distinctly 

 arcuately striate. U. heynemanni, no. 133. 



3. Stouter, the diam. one-fourth the length, 13 to 15 

 x 4 to 5 mm., with 7 to 8 whorls ; finely striate. 



U. obliqua, no. 134. 



126: U. HIDALGOI (Arango). PI. 54, figs. 78, 79. 



Shell cylindric or somewhat swollen in the middle, slightly 

 tapering to the wide truncation; thin, brownish, translucent, 

 marked with few or many longitudinal opaque ivhite streaks, 

 and with small \vhite beads irregularly strung along below 

 the suture, usually obsolete on the later whorls. Surface 

 glossy, nearly smooth, the latter half of the last tvhorl sculp- 

 tured ivith narrow, wide-spaced riblets. Whorls slightly con- 

 vex, the last becoming free, with a long, rounded, descending 

 neck, which is very indistinctly angular beneath, and has an 

 axial groove above. Aperture rounded, slightly narrower 

 above, light chestnut-brown inside, the white lip rather widely 

 reflexed. Axis encircled by two subequal lamella?, the lower 

 one minutely spinose. 



Length 12, diam. 2.7 mm. ; whorls 



V Cerro de Cabras. 

 Length 16, diam. 2.7 mm. ; whorls 



Length 15-16, diam. 2.5 mm.; whorls 9-12 (Arango). 



Western Cuba: Bebedero, in Pinar del Rio (type loc.) ; 

 Cerro de Cabras, Pinar del Rio (Arango). 



Cyl. hidalgoi ARANGO, Contrib., p. 107. CROSSE, Journ. de 

 Conch., 1890, p. 217, pi. 4, f. 3, a, b. 



