UROCOPTIS OF JAMAICA. 143 



Section Bactricoptis Pilsbry, 1903. 



Shell small, cylindric-tapering, finely striate, with the last 

 whorl free, moderately keeled below. Axis simple and 

 straight or slightly sinuous. Dentition as in the large forms 

 of Urocoptis. Type U. rosea var. montana. (Bactricoptis, a 

 cut stick.) 



These snails occur in the mountainous interior of the west- 

 ern half of Jamaica, the region inhabited by the cylindrus 

 group, to which they are closely related, differing so far as 

 we know in little besides the greatly diminished size of the 

 shell. The species were formerly placed in the Cuban group 

 Cocklodinella, but the dentition proves that position to be 

 erroneous, the very narrow central teeth, and numerous very 

 slowly diminishing laterals, clearly showing the relationship 

 with the other Jamaican forms of Urocoptis. 



Key to Species. 



1. Striation moderately fine, the striae on the last whorl 

 narrower than their intervals. 



a. Striae quite arcuate ; internal column twisted in the 

 last 3 or 4 whorls ; basal keel inconspicuous. 



U. rosea, no. 19. 



&. Striae finer; internal column straight; basal keel 

 strong. U. hollandi, no. 20. 



2. Striation excessively fine and regular, the striae as wide 

 as the intervals. 



a. Somewhat variegated by streaks or patches ; whorls 

 10 or 11. U. hydrophana, no. 21. 



b. Uniform pale brown or white, glossy; whorls 6 or 

 7. U. pupaformis, no. 22. 



19. U. ROSEA (Pfeiffer). PI. 34, figs. 24, 25, 26. 



Shell cylindric-subfusiform, truncate, thin, diaphanous; 

 rose-colored, very minutely obliquely striate. Whorls 10, a 

 little convex, the last very shortly built forward, base obso- 

 Letely carinate. Aperture circular; peristome narrowly re- 

 flexed throughout. Length 16, diam. 5 mm.; aperture 3^ 

 mm. wide (Pfr.). Jamaica. 



