242 UROCOPTIS, S. G. GONGYLOSTOMA. 



by the columellar fold; peristome thin, expanded, the upper 

 margin adnate to the preceding whorl. Length 24, diam. 

 4 mm.; varies to smaller diameter (Gundlach). 



Western Cuba: Mt. Guajaybon, prov. Pinar del Rio, on 

 trees and rocks. 



Cyl. crenulata GUNDL., Malak. Bl., iii, 1857, p. 42. PFR., 

 Monogr., vi, p. 358 ; Novit. Conch., p. 454, pi. 100, f . 4, 5 

 ARANGO, Contrib.. p. 105. 



Pfeiffer finally considered this a variety of U. acus, but 

 Arango retains it distinct. The thread- carinate rather than 

 strongly carinate base is unlike acus, and it is apparently 

 nearer U. adnata. I have not seen specimens. 



Pfeiffer describes it thus: "Shell subarcuate-rimate, cylin- 

 dric-turreted, entire or shortly truncate, thin, arcuate-stri- 

 atulate, pale corneous. Spire long, noticeably tapering above, 

 the vertex rather acute; suture distinctly crenulate. Whorls 

 20 in an entire specimen, a little convex, the last costulate, 

 marked with a reddish line, and a thread-like carina below 

 it, not free in front. Aperture a little oblique, rounded-oval ; 

 columella subplicate ; peristome thin, expanded, and appressed 

 to the preceding whorl or nearly interrupted. Length 26, 

 diam 5 mm. ; apert. 4% mm. long. ' ' 



The figures are from Pfeiffer's, and doubtless represent 

 an authentic specimen. 



121. U. ACUS (Pfeiffer). PI. 55, figs. 93, 94. 



Shell very shortly rimate, slenderly cylindric or pillar- 

 shaped, the upper third slowly tapering to a narrow trun- 

 cation; thin, pale corneous. Surface glossy, smooth except 

 below the suture, where it is coarsely striate, the last whorl 

 becoming rib-striate, the riblets rather widely spaced. 

 Whorls somewhat convex, the last not free in front, the base 

 defined by a strong, cord-like keel, crenulated by the striae. 

 Aperture irregularly rounded, the peristome expanded, con- 

 tinuous across but adnate to the parietal margin. Colu- 

 mellar fold emerging, obliquely truncate below. Axis slen- 

 der, somewhat sinuous, encircled by a thin, serrate lamella 

 near the base in each whorl. 



