240 UROCOPTIS, S. G. GONGYLOSTOMA. 



with a very narrow red band below, the last notched [rimate]. 

 Aperture connected, anteriorly produced, expanded, a little- 

 contracted above the middle. Cuba." (Sowb.). 



Cyl. tumidiora SOWERBY, in Reeve's Conchologia Iconica, 

 xx, pi. 8, f. 65 (April, 1875). 



1 'The whorls are much shorter and more convex than in 

 Cylindrella irrorata" (Sowb.). 



118. U. DECOLORATA ('Gundl.' Pfr.). PI. 55, figs. 95, 96, 97. 



Shell very shortly rimate, slender, cylindric, the upper 

 third or half tapering to a narrow truncation; thin, pale 

 corneous, with a faint brown band below the middle of the 

 last whorl ; the surface glossy, usually worn on the apertural 

 side, nearly smooth, the last whorl elegantly, finely rib-striate 

 on the base and behind the outer lip, the early whorls also 

 showing traces of fine striation. Whorls slightly convex, 

 weakly, coarsely crenate below the suture, the last having a 

 low cord-like basal keel, not free in front. Aperture rounded- 

 oblong, the peristome expanded, wholly adnate or interrupted 

 above. Axis slender, encircled by a single thin, serrate 

 lamella. ^ 



Length 25-26, diam. 4 mm. ; whorls 14. 



Length 20, diam. 3.7 mm. ; whorls 12. 



Length 22.5, diam. 3.6 mm.; whorls 17% (apex perfect). 



Length 24, diam. 4.5 mm. ; whorls 14 ( Gundl. ) . 



Western Cuba: Santa Cruz de los Pinos, on trees (Gund- 

 lach). 



Cyl. decolorata Gundl. mss., PFR., Malak. BL, xi, 1863, p. 

 4, no. 46 ; Monogr., vi, p. 358 ; Novit. Conch., p. 454, pi. 100 r 

 f. 6, 7. ARANGO, Contrib., p. 104. CROSSE, J. de C., 1890, 

 p. 209. 



Near U. sauvalleana, but more slender, thinner, with no- 

 sutural band, and with stronger sculpture on the latter part 

 of the last whorl. About 5% whorls are above the plug in 

 unbroken shells, ordinary truncate individuals having 12 

 to 14 whorls. Most adult shells have the gloss worn from 

 the ventral side, which becomes dirty white, a circumstance 

 which suggested the name. The same wearing is occasionally 

 observed in U. torquata and sauvalleana. 



