UROCOPTIS, S. G. GONGYLOSTOMA. 245 



Length 24, diam. 6.7 mni. ; whorls 9. 



Length 23, diam. 7.2 mm. ; whorls 8y 2 . 



Length 20, diam. 5.7 mm. ; whorls 8Vi>- 



Length 21, diam. 7 mm.; whorls 9 (Pfr., type). 



Western Cuba: Between Caiguanabo and Chorrera 

 (Wright, type loc.) ; San Andres, near Vinales, Pan de 

 Azucar (Wright), all in prov. Pinar del Rio. 



Cyl. arcustriata Wright, PFR., Mai. Bl., xi, 1863, p. 3, no. 

 44; Novit. Conch., p. 259, pi. 65, f. 5-7; Monogr., vi, p. 369.- 

 ARANGO, Contrib., p. 112. 



Wide for its length, approaching the contour of the Jamai- 

 can Cylindrellas. Specimens before me from the three locali- 

 ties agree in all respects. It is wider and more finely striate 

 than U. assimilis. 



125. U. ASSIMILIS (Arango). PL 56, figs. 26, 27, 28. 



Shell cylindric, slowly tapering above, whitish with a 

 purple-brown basal band, narrowly showing at the suture. 

 Somewhat shining, rib-striate, the riblets much coarser than 

 in U. arcustriata, about half as wide as the intervals, more 

 widely spaced on the latter half of the last whorl, as usual. 

 Whorls slightly convex, the last rounded below, very shortly 

 free in front. Aperture subcircular, the peristome expanded, 

 continuous, free above. Columellar fold emerging nearly to 

 the lip. Axial lamella deeply cut into strong, thin teeth 

 (pi. 55, fig. 99) . 



Length 21.5, diam. 5.4 mm. ; whorls 9!/2. 



Length 24, diam. 5.6 mm. ; whorls 10. 



Length 23-26, diam. 6 mm. ; whorls 12 in an entire shell 

 (Arango). 



Western Cuba: La Jagua, near La Palma, Pinar del Rio 

 (Arango). 



Cyl. assimilis ARANGO, Proc. A. N. S. Phila. 1884, p. 211, 

 fig. 2 (Nov. 4, 1884) . CROSSE, J. de C., 1890, p. 223, pi. 4, f. 1. 



Near U. arcustriata, but more cylindrical, with coarser, 

 more widely spaced riblets, and slightly more free last whorl. 



