UROCOPTIS, S. G. GONGYLOSTOMA. 243 



Length 24, diam. 3.5 mm. ; whorls 16. 



Length 18.2, diam. 2.8 mm. ; whorls 16. 



Length 24-26, diam. 3.5 mm.; whorls 18-19 (Pfr., types). 



Western Cuba: Plantation Cayajabos or Callajabas, dis- 

 trict of Artemisa (E. Otto, type locality) ; Loma del Cuzco 

 (Gundjach) ; Candelaria (Arango), all in prov. Pinar del Rio. 



Cyl acus PFR., Symbol* ad Hist. Hel., i, p. 47 (1841) ; 

 in Philippi, Abbild., i, p. 182, pi. 1, f . 8 ; Conchyl. Cab., p. 66, 

 pi. 7, f. 16-18; Malak. BL, i, 1854, p. 213; ii, 1855, p. 179; 

 Monogr., ii, p. 383; iii, 579; iv, 711; vi, 359. GUNDLACH, 

 Malak. BL, iv, 1857, p. 46. SOWERBY, C. Icon., xx, pi. 7, 

 f. 62. ARANGO, Contrib., p. 105. 



The special differentiation of this species is the strong 

 basal keel. 



122. U. THOMSONI (Arango). PI. 55, figs. 90, 91, 92. 



Shell very shortly rimate, cylindric or pillar-shaped, the 

 upper third slowly tapering to the narrow truncation ; thin, 

 corneous ; surface shining, subregulaiiy and strongly, ob- 

 liquely rib-striate, the riblets rounded, narrower than the 

 intervals, becoming better defined and thread-like on the last 

 whorl. Whorls somewhat convex, the last barely free in 

 front, rounded beneath, and girt with a reddish band, some- 

 times very faint. Aperture round-oval, the peristome con- 

 tinuous, shortly free above, expanded. Columella obliquely 

 truncate. Axis slender, somewhat sinuous, encircled by a 

 thin basal lamella serrate with long teeth. 



Length 21.6, diam. 4.7 mm.; whorls 12 (plug at 10). 



Length 17, diam. 3.7 mm. ; whorls 11. 



Western Cuba: "La Jagua' : (Sierra la Jagua), near La 

 Palma, Pinar del Rio (Arango, type loc.). 



Cyl. thomsoni ARANGO, Proc. A. N. S. Phila. 1884, p. 212, 

 fig. 3 (Nov. 4, 1884) . CROSSE, Journ. de Conchyl., 1890, p. 

 223, pi. 4, f. 4. 



Near U. acus and U. decolorata, but strongly rib-striate. 

 A specimen with the apex perfect has 14 whorls, according 

 to Arango. Figured from a cotype. 



