182 UROCOPTIS, S. G. GONGYLOSTOMA. 



neck, separate this species from the allied U. illamdlnta. An 

 entire shell has 13 whorls, according to Arango. The figures 

 and description are from specimens sent by him. 



55. U. SOLUTA (Pfeiffer). PL 42, figs. 93, 94, 95. 



Shell fusiform, rather thin, slightly inflated in the middle, 

 the upper third or more tapering to the narrow truncation; 

 pale corneous. Surface rather glossy, densely and finely 

 striate, the stride smooth, about as wide as the intervals, be- 

 coming much coarser, sharper and more widely spaced on the 

 free portion of the last whorl. Whorls 9-10, convex, the last 

 produced downward and forward in a rather long, round 

 neck. No basal keel. Aperture rounded-oval, longer than 

 wide, the peristome continuous, the outer margin expanded, 

 upper and columellar margins reflexed, whitish. Axis slender 

 and straight. 



Length 12.5, diam. 3.2 mm. ; whorls 8%- 



Length 13.8, diam. 3.1 mm. ; whorls 9%. 



Length 14, diam. 3.5 mm.; whorls 9 (Pfr's type). 



Western Cuba : Between Guajaybon and la Chorrera, Pinar 

 del Rio, on walls, type loc. ; S. Andres (Wright). 



Cyl. soluta PFR., Mai. BL, xi, 1863, p. 6; Monogr., vi, p. 

 374. SOWERBY, Conch. Icon., xx, pi. 9, f. 75. ARANGO, 

 - Contrib., p. 112. 



Differs from U. atropurpurea by the longer neck, more 

 coarsely sculptured than the rest of the shell, and the finer, 

 closer striation of the spire, as well as the paler color. 



Subgenus GONGYLOSTOMA Albers, 1850. 



Urocoptis with one or more spiral axial lamellae, the free 

 edge of the lower lamella, at least in the upper whorls, being 

 serrate, cut into teeth, or bearing spines directed radially and 

 more or less toward the aperture. Early whorls generally 

 lost from the adult shell; apical whorls smooth (except in 

 Fibricutis) ; basal keel generally indistinct or wanting. Type 

 U. elegans (Pfr.). (Gongylostoma, round mouth.) 



Dentition quite various in regard to the number of teeth, 

 see p. 110, but the teeth of the central row are wider than in 

 Idiostemma, agreeing with C ochlodinella and Autocoptis. 



