244 UROCOPTIS, S. G. GONGYLOSTOMA. 



123. U. COLORATA (Arango). PL 56, figs. 29, 30, 31. 



Shell shortly rimate, cylindric, the upper half tapering ; 

 slowly to the rather narrow truncation, thin, corneous, some- 

 what translucent, encircled near the base of the last whorl 

 with a red-brown band, which ascends above the suture. 

 Surface glossy, irregularly wrinkle-striate, the striae coarser 

 below the suture, then often splitting or branching; stronger 

 and narrower on the latter half of the last whorl. Whorls 

 but slightly convex, the last somewhat carinate basally in 

 front, the keel becoming obsolete on the latter half; not free 

 in front. Aperture subcircular, the peristome expanded, \ 

 continuous, barely free above or very shortly adnate. Axis 

 with a thin, deeply incised, serrate lamella. 



Length 23, diam. 4.8 mm. ; whorls 11. 



Length 21, diam. 4.2 mm f ; whorls 12. 



Western Cuba: La Chorrera, Pinar del Rio. 



Cyl. colorata ARANGO, Proc. Acad. N. S. Phila. 1882, p. 106 

 (June 27, 1882) ; 1884, p. 212, f. 5. CROSSE, J. de C., 1890, 

 p. 223, pi. 4, f. 2. 



U. thomsoni and U. decolorata and U. adnata are narrower 

 shells, the former one being probably the most closely related 

 to colorata. U. assimilis has more clearly-cut striae and a 

 different coloration. 



124. U. ARCUSTRIATA (' Wright' Pfr.). PI. 56, figs. 24, 25. 

 Shell shortly rimate, cylindric, the upper half slowly 



tapering to a truncation somewhat less than one-half the 

 diam. of the shell; moderately solid; whitish with a purple- 

 brown basal band, sometimes showing a little along the suture. 

 Nearly lustreless, closely, finely and regularly striate, the 

 striae arcuate, as wide as the intervals; a little more spaced 

 on the latter part of the last whorl. Whorls convex, the last 

 broadly rounded beneath, not free in front. Aperture cir- 

 cular, the peristome expanded, continuous, touching the pre- 

 ceding whorl above, or barely free. Columella strongly ob- 

 liquely truncate below. Axis encircled by a basal thin lamella, 

 very deeply cut into long teeth. 



