250 UROCOPTIS, S. G. GONGYLOSTOMA. 



130. U. DISCORS (Poey). PL 57, figs. 42, 45. 



''Differs from C. variegata Pfr. by the anteriorly less 

 attenuate shell, more distant riblets and crenulate suture. 

 Axis spirally one-lamellate" (Poey). 



Shell cylindric-fusiform, the upper third or half tapering 

 to the truncation, thin, corneous, profusely variegated with 

 cream-whitish. Surface scarcely glossy, sculptured with 

 whitish riblets, separated by intervals of about three times 

 their own width, and regularly crenate at the suture by low 

 whitish nodules, about one to each two ribtets. Whorls but 

 slightly convex, the last shortly free, slightly descending, 

 weakly carinate below. Aperture rounded, light brown in- 

 side; peristome white, expanded, subreflexed. Axis straight, 

 slender, encircled by a single thin, sub-basal lamella. 



Length 14.5, diam. 3.3 mm. ; Avhorls 



Length 13, diam. 3.4 mm. ; whorls 



Length 15, diam. 4 mm.; whorls 11 (Pfr). 



Western Cuba: Sierra de Guane, prov. Pinar del Rio 

 (Poey). 



Cyl. discors POEY, Memorias, etc., ii, p. 38. PFR V Malak. 

 BL, v, 1858, p. 8; Monogr., iv, p. 702; Malak. BL, xi, 1864, 

 p. 127 (occurrence at Lagunillas). ARANGO, Contrib., p. 

 118. 



Very closely related to U. heynemanni and U. diaphana 

 in external features of the shell, the species being separated 

 chiefly by details of the structure of the axis. 



130 a. Var. lagunillensis Pils., n. var. PI. 57, figs. 47, 49. 



Shell rather obese, swollen in the middle, though varying 

 to subcylindric forms; variegated with cream on a corneous 

 ground, and with small subsutural beads. Last whorl very 

 shortly free. Axis rather strong, encircled by two lamellae, 

 the lower much wider below, the upper lamella being merely 

 a low thick cord in the penultimate whorl, becoming thinner 

 and about equal to the lower lamella in the whorls above the 

 middle. 



Length 13, diam. 3.7 mm. ; whorls 9%. 



