UROCOPTJS, S. G. GONGYLOSTOMA. 207 



(1857). ARANGO, Contrib., p. 115. CROSSE, J. de C., 1890, 

 p. 228. ? C. volubilis PFR., Conchyl. Cab., p. 24, pi. 3, f. 15-17. 



The specimens figured are from Rangel, the type locality. 

 It is a corneous, subtranslucent shell, with the apex perfect 

 or narrowly truncate. The upper third tapers rather rapidly, 

 the rest of the shell being subcylindric ; last whorl more or less 

 free and descending. There is no basal keel. The axis bears 

 three lamellae, the upper one in the intermediate whorls is 

 decidedly largest, the lower one smallest, and bearing slender, 

 rather long widely spaced spines (short in some specimens). 

 The size and number of whorls varies a good deal. 



Length 14.5, diam. 2.3 mm.; whorls 22% (spire complete). 



Length 13, diam. 2.3 mm.; whorls 19 (spire complete). 



Arango has called attention to the diverse sculpture of the 

 axis in this species and C. volubilis Morel., a species with 

 which Pfeiffer united saxosa. 



78. U. PATRUELIS (Arango). 



Very like Cyl. saxosa Poey, but distinct by the very wide 

 upper lamella of the trilamellate internal column, the lower 

 lamella but little prominent ; by the wider shell, less produced 

 last whorl, flatter and more widely spaced riblets (Arango). 



Western Cuba: Plantation San Felipe Benicio, near Can- 

 delaria, Pinar del Rio (Arango). 



Cyl. patruelis AR., An. Real Acad. Cien., etc., de la Habana, 

 xii, p. 283, no. 11 (1876) ; Contrib., p. 115. 



79. U. OLIGOMESUS Pilsbry, n. sp. PL 48, fig. between 8 and 

 12, and fig. 13. 



Shell cylindric in the lower half, the upper half tapering 

 to a moderately wide truncation; thin, corneous, subtrans- 

 parent, often reddish-brown or dusky above from the con- 

 tained soft parts. Surface glossy, finely and regularly 

 striate, the striae low, but on the last half whorl becoming 

 thread-like and sometimes more spaced. Whorls convex, the 

 last free, produced in a short neck. Aperture circular, the lip 

 equally expanded and reflexed throughout. Axis with three 

 lamellae, the upper widest, median lamella very low, smallest, 



