244 UROCOPTIS, S. G. GONGYLOSTOMA. 



123. U. COLORATA (Arango). PI. 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 strige 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 adiiate. Axis 

 with a thin, deeply incised, serrate lamella. 



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



Length 21, diam. 4.2 mm. ; 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 stria? 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 tlie 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. 



