274 UROCOPTIS, S. G. GONGYLOSTOMA. 



The figure is somewhat faulty in the shape of the spire, which 

 should be attenuated above for a greater distance. Some 

 specimens are shortly truncate, then having, of course, fewer 

 whorls than the number given above for entire shells. 



The dentition is 7.2.1.2.7, but the three outer laterals have 

 no cutting points, as in plicata, which it resembles. 



158. U. CLERCHI ('Arango' Pfr.). 



Shell fusiform-subulate, thin, nearly smooth, glossy, blue- 

 whitish streaked with corneous. Spire slender, the apex 

 subacute. Whorls about 16, convex, the upper irregularly 

 marked with a few riblets, the median whorls smooth, last 

 whorl free, pulled out in a rather long neck, sculptured with 

 compressed, acutely elevated, less close ribs. Aperture ob- 

 lique, subcircular, the peristome continuous, equally and 

 rather widely expanded throughout. Length 11, diam. nearly 

 2 mm. ; diam. aperture 2 mm. (Pfr.) . 



Western Cuba: Sitio Perdido, at Jaruco, prov. of Havana 

 (Clerch). 



Cyl. clerchi Arango mss., PFR., Malak BL, xvii, 1870, p. 91 ; 

 Monogr., viii, p. 443. ARANGO, Contrib., p. 124. 



' ' Very closely related to C. sexdecimalis Jim., but differing 

 by the convex whorls more broadly expanded peristome, and 

 especially the lamelliform ribs of the free part of the last 

 whorl" (Pfr.). The internal column is simple, according 

 to Arango. 

 159. U. CAMOENSIS (Pfeiffer). PI. 62, figs. 43, 44, 45. 



Shell fusiform-subulate, the upper half strongly attenuate 

 to the bulbous apex, lower half somewhat cylindric; thin, 

 corneous with some white lines and spots. Surface hardly 

 glossy, irregularly sculptured with narrow, thread-like rib- 

 lets, separated by much wider intervals. Whorls somewhat 

 convex, the last descending in a rather short, round neck. 

 Aperture somewhat oblique, circular, the peristome evenly 

 expanded. Axis slender and straight, but with a perceptible 

 spiral twist. 



Length 12.2, diam. 1.6 mm. ; whorls 20. 



Length 12, diam. hardly 2 mm.; whorls 20-21. (Pfr.). 



