UROCOPTIS OP JAMAICA. 125 



Rock Fort, near Kingston (Johnson and Fox, figs. 9, 77) ; 

 Hope River, farther eastward, 5 or 6 miles from Kingston 

 (Henderson and Simpson, figs. 5-8). 



Cylindrella columna AD., Contrib. no. 2, p. 22 (Oct., 1849). 

 PFR., Monogr., iii, p. 570. HENDERSON, Nautilus, viii, p. 

 19, no. 89 (not no. 81). C. brevis var. intermedia C. B. A., 

 HENDERSON, Nautilus, viii, p. 19, no. 87. 



A short, pillar-like form, typically quite easily distinguished 

 from brevis. Even more frequently than in brevis, the peri- 

 stome remains adnate above. It is common a few miles east 

 of Kingston. At an old lime-kiln at Rock Fort the shells are 

 about 13 mm. long, 4 to 5 mm. wide, with 7 to 9y 2 whorls, and 

 chiefly brownish (figs. 8, 77). Specimens from Hope River 

 (pi. 33, figs. 5-8) are much more variable in size: 



Length 21, diam. 7.2 mm. ; whorls 9%. 



Length 17, diam. 6 mm. ; whorls 9. 



Length 11.5, diam. 4.3 mm. ; whorls 7%. 



All intermediate sizes are fully represented. The whorls 

 are flat or slightly convex, and the color varies from gray- 

 white to occasional pink shells. 



C. columna "var. intermedia more resembles C. brevis in 

 having the whorls a little convex ; but the shell is longer than 

 the type of C. columna, and the aperture is a little larger. 

 Length .78, breadth .22 inch [19.5, 5.5 mm.]" (C. B. Ad.). 

 This form seems to have very slight claims to varietal distinc- 

 tion. I would refer the specimens before me, so named by 

 Adams, to U. brevis. 



Var. ABBREVIATA (Deshayes) . PL 33, figs. 90-94. 



One of the most cylindric of the genus ; broadly truncate at 

 the summit, the spire very obtuse ; composed of 6 nearly flat 

 whorls, very slowly increasing, and joined by a simple, super- 

 ficial suture. The last whorl is very short, a little higher than 

 wide, its length about two-thirds that of the spire, base very 

 convex, bearing a narrow, obtuse angle, further down than in 

 other species. The aperture projects forward but little, is 

 entirely free, circular, white; peristome thin, sharp, and 

 strongly reflexed. Surface covered with very fine, regular 



