258 UROCOPTIS, S. G. GONGYLOSTOMA. 



Cyl. trilamellata PFR., Malak. Bl., xi, 1864, p. 128; Novit. 

 Conch., p. 260, pi. 65, f . 13-15 ; Monogr., vi, p. 368. ARANGO, 

 Contrib., p. 111. 



This species stands very near U. violacea, differing chiefly 

 in the structure of the axis. It is also somewhat related to 

 U. vignalensis, but much more slender and less tapering above. 

 There is but little variation in the 20 specimens before me. 



140. U. NUBILA (Poey). PI. 57, fig. 40. 



Shell elongate, cylindrical, thin, but little shining, brown, 

 sparsely marked with transverse lines; striate-plicate, the 

 plica? arcuate; spire truncate, 10 slightly convex whorls re- 

 maining, the last whorl free near the contiguous whorl, sub- 

 carinate beneath; suture simple or sometimes very obsoletely 

 crenulate. Aperture vertical, suboval (narrower behind) ; 

 peristome simple, narrowly expanded. Axis spirally two- 

 lamellate. Length 20, diarn. 5 mm. (Poey). 



Western Cuba : Paso Real, near Guane, prov. Pinar del Rio, 

 on stones (Poey). 



Cyl. nubila POEY, Memorias, ii, p. 38, no. 44, pi. 1, f. 25. 

 PFR., Mai. BL, v, 1858, p. 8; Monogr., iv, p. 700. ARANGO, 

 Contrib., p. 112. 



Very near U. violacea apparently, but the aperture is more 

 pear-shaped, and the axis bilamellate. It is wider than the 

 bilamellate U. plumbea. Poey mentions a form 4 mm. in 

 diam. 



141. U. VIOLACEA ('Wright' Pfr.). PI. 57, figs. 32, 33, 34, 35. 



Shell subcylindric or somewhat fusiform, the upper third 

 tapering to a rather narrow truncation; somewhat solid, 

 purplish-brown. Surface lustreless, sculptured with narrow, 

 widely spaced whitish riblets, which are crowded a little 

 closer just behind the peristome. Whorls convex, the last 

 shortly free in front. Aperture rounded, pear-shaped, sub- 

 vertical, purplish-brown inside, the expanded lip whitish. 

 Axis encircled by one thin sub-basal lamella (denticulate 

 above), and two hardly noticeable spiral cords above it, 

 obsolete in the last two whorls. 



