114 UROCOPTIS OF JAMAICA. 



This group differs from typical Urocoptis in the torsion of 

 the coluniellar axis, a feature not hitherto noticed in Jamai- 

 can species. U. brevis, in which the pillar is slightly twisted, 

 forms a connecting link between this line of evolution and 

 the typical Urocoptis. Two species, U. sanguinea and U. 

 lata, occur in the eastern half of Jamaica, and two, U. ame- 

 thystina and U. megacheila, in the extreme west. (Speira, 

 spire, and koptein, cut.) 



1. Peristome free throughout. U. lata, no. 1. 



2. Peristome adnate above. 



a. Blood-red or brown ; 20 x 7 to 29 x 9% mm. U. san- 

 guinea, no. 2. 



b. Dark purple-brown or plum color; lip extensively 

 adnate above ; stouter, 24.5 x 8.7 to 28 x 10 mm. U. 

 megacheila, no. 4. 



c. Dark red-brown with a dusky-purple subsutural belt; 

 narrower, 23 x 6 mm. U. amethystina, no. 5. 



Another species, U. instabilis, no. 3, is provisionally re- 

 ferred to this section. Its axis is unknown. 



These snails live on the ground, among the scrub and dead 

 leaves, and are of about the color of their surroundings. 



1. U. LATA (C. B. Adams). PI. 30, figs. 42-50. 



"Shell very robust, cylindrical in the lower three-fourths, 

 rapidly tapering above ; wax color, with a dark brown line 

 next below the suture; with excessively minute, crowded 

 transverse [obliquely longitudinal] striag; anterior spiral 

 keel very prominent ; apex not very broadly truncate, with the 

 loss of - - whorls ; whorls remaining 8%, very narrow, slightly 

 convex, with a lightly impressed suture. Aperture consider- 

 ably produced beyond the penult, whorl, transversely ellip- 

 tical; lip broadly reflected. Length .86 inch, breadth .33 

 inch." [21.5x8.3 mm.] 



Jamaica: John Crow Hills, in the northeastern portion of 

 Portland. Map 2, area no. 1. 



Cylindrella lata AD., Contrib. to Conch, no. 5, p. 82 (1850). 



-PFR., Monogr., iii, p. 569. SOWERBY, C. Icon., xx, pi. 7, f. 



58. C. lata var. producta C. B. AD., Contrib. no. 9, p. 161 



