260 UROCOPTIS, S. G. GONGYLOSTOMA. 



somewhat closely arcuately ribbed; corneous-brown, the ribs 

 paler. Spire noticeably attenuated towards the somewhat 

 obtuse apex, entire or shortly truncate ; suture deep, nodulose- 

 crenate. Whorls 16-17, convex, the last shortly free, de- 

 scending, subcylindrical, anteriorly more closely costulate- 

 striate. Aperture a little oblique, pirif orm-rounded ; peri- 

 stome whitish, narrowly reflexed throughout. Length 16.5 

 to 18, diam. scarcely 2y 2 mm. (Pfr.). 



Western Cuba: Guane, prov. Pinar del Rio (Wright). 



Cyl. macro, Wr., ARANGO, Repertorio fisico-natural de la 

 isla de Cuba, ii, no. 4, p. 86 (1867) ; no. 12, p. 270 (1868) 

 nude name; Contrib., p. 126. Cyl. macra Wright, PFR., 

 Malak. BL, xiv ; 1867, p. 210; Monogr., vi, p. 388; Novit. 

 Conch., p. 457, pi. 100, f. 12, 13. 



A less robust, paler shell than U. plurtibea, with the neck 

 miich shorter. Figs. 91, 93 of pi. 59 are copied from Pfeif- 

 fer's illustration of the type. Fig. 92 is from a specimen 

 from the type locality, measuring 16.5 x 2.3 mm., with 17 

 whorls. The sutural crenation mentioned by Pfeiffer is 

 rather irregular and inconspicuous in most specimens. The 

 aperture is distinctly longer than wide, but in a front view 

 this is somewhat obscured by foreshortening, owing to its 

 obliquity. The slender axis is sinuous, especially in the later 

 whorls, and is encircled near the base in each whorl by a 

 moderately projecting, thin spiral lamella. The general 

 form is cylindric, the upper third only tapering. 



Group of U. pruinosa. 



Shell rather large, cylindric, brownish with occasional 

 white-bordered dark stripes, the base carinate; axis with two 

 equally prominent lamellae. 



144. U. PRUINOSA (Morelet). PI. 54, figs. 74, 75, 76. 



Shell cylindric or column-like, more or less and quite 

 gradually tapering above, rather thin, widely truncate; 

 brownish or purplish corneous, with a wide whitish belt 

 below the suture, and having occasional white-bordered dark 



