UROCOPTIS, S. G. GONGYLOSTOMA. 227 



edge, the upper lamella lower, but slightly stouter, cord-like. 

 The upper lamella diminishes upwards, hardly appearing 

 in the upper half of the shell, where the axis is straight, 

 encircled by a single compressed, denticulate lamella. 



Length ]2.6, diam. 3.3 mm.; whorls 10%. 



Length 12, diam. 2.9 mm. ; whorls 11. 



Length 10.8, diam. 3 mm.; whorls 9%. 



Western Cuba: Punta de la Jaula (type locality) and 

 Sitio Nuevo, Guane (Wright). 



Cylindrella concreta Gundl., PFR., Novit. Conch., pi. 97, 

 f . 12-15, but not the description. Cyl. distincta Gundl. mss., 

 ARANGO, An. Real Acad. Cien., etc., de la Habana, xii, p. 284, 

 no. 13 (1876). 



Formerly confused with U. concreta, which is almost ex- 

 actly similar in external characters. Pfeiffer figured a speci- 

 men of distincta for concreta in the Novitates Conchologicae. 

 Probably Sowerby's figure of concreta is referable rather to 

 the present species. 



99. U. CONSANGUINEA (Arango). 



Differs from the preceding [difficultosa] by the opaque 

 shell, last whorl carinate at the base, and internal column 

 provided with two weaker descending laminae. The number 

 of whorls and length of the shell are as in the preceding 

 species (Arango}. 



Cuba. 



Cyl. consanguinea ARANGO, Proc. A. N. S. Phila. 1882, 

 p. 107. 



100. U. CRISTALLINA ('Wright,' Pfr.). PL 54, figs. 80, 81, 82. 



Shell subrimate, cylindric below, the upper half or third 

 tapering to a rather wide truncation; thin; transparent 

 whitish. Surface very glossy, smooth or narly so on the 

 median convexity of each of the whorls of the cylindrical 

 portion of the shell, elsewhere regularly striate, the sutures 

 finely crenulated by the striae; base and neck of the last 

 whorl striate. Whorls convex, the last shortly free in front. 

 Aperture round-oval, oblique, the peristome very narrowly 



