UROCOPTIS OF JAMAICA. 121 



allied U. amethystina, and with a less strong spiral twist of 

 the pillar than either that or U. sanguinea. 



5. U. AMETHYSTINA (Chitty). PL 31, figs. 59, 60. 



Shell shortly rimate, cylindrical, slightly and slowly taper- 

 ing above, dusky red-brown with a blackish-purple belt below 

 the suture, finely rib-striate, the striae nearly straight. 

 Whorls about 9%, somewhat convex, the last not free in 

 front, with a low basal carina. Aperture subvertical, brown 

 inside, the peristome broadly expanded and reflexed, adnate 

 above, nearly white, rather thick. Internal column strongly 

 twisted spirally in the penultimate and next earlier whorls, 

 much less twisted in the next whorl upward, slender and 

 straight above. 



Length 23, diam. 6 mm. 



Jamaica: Mor eland, in Westmoreland, and. Endeavor, in 

 the adjacent part of Hanover. (Chitty.) 



C. amethystina CH., Ann. Lye. of N. H. of New York, vi, 

 p. 156, pi. 5, f. 3, 4 (1855), with var. cerina. PFR., Monogr., 

 iv, p. 697. SOWERBY, Conch. Icon., xx, pi. 2, f. 15 (not good). 



This species resembles U. megacheila in color, but is more 

 like the more cylindrical form of U. sanguinea in shape. 

 The color is sometimes pale brownish with a dark sutural belt, 

 and according to Chitty "a variety occurs of a waxy color, 

 which I designate C. amethystina var. cerina." The speci- 

 mens figured were sent by Chitty. It has not been found 

 by recent collectors. 



Section Urocoptis s. str. 



The typical forms of Urocoptis are moderately large, 

 densely striate shells, in which the axis is slender and straight, 

 U. cylindrus being the type. All are Jamaican. The species 

 fall into three groups, of which that of U. brevis forms a con- 

 necting link with the preceding section. 



1. Group of U. brevis. Rather small, oblong species with 

 the summit rounded, axis a little sinuous or straight, the apex 

 (in U. brevis) ribbed. 



2. Group of U. cylindrus. Cylindric, moderate or large 

 shells, with simple axis. 



