UROCOPTIS OF JAMAICA. 131 



shorter, more pupiform, and with decidedly more widely 

 spaced striae. 



Group of U. cylindrus. 



Rather broadly truncate, large, and often beautifully col- 

 ored forms, with simple, straight internal pillar (pi. 41, fig. 

 76, U. ambigua var. magna), the peristome normally free 

 above, the striation fine and close. 



These forms are distributed throughout the interior of the 

 western half of Jamaica eastward to Clarendon. The several 

 races, though given specific rank, are only nominal species, as 

 intergradation closely connects the whole series. It is often 

 a very difficult matter to tell where to place some specimens 

 indeed it becomes merely arbitrary where the characters of 

 two forms are about equally mingled. There are no natural 

 lines of demarcation. The nominal species are typically 

 characterized as follows, beginning with the easternmost : 

 No. 12. U. procera: Shell rather slender, tawny (or sometimes 



pink) ; basal keel strong. 

 No. 13. U. dubia: Shell slender and small, dingy rose tinted; 



basal keel weak. 

 No. 14. U. ambigua: Shell stouter, roseate or rose-brown; 



basal keel short, weak. Length 19-26 mm., three times the 



diam. 



var. fortis: Shell wider, the diam. more than one-third 



the alt. ; 25 x 9 mm. 

 var. magna: Much larger, solid, rose-colored; basal keel 



weak, 

 var. elizabethensis: Narrow and parallel-sided, whorls 



flattened. Diam. less than one-third the length. 

 No. 15. U. cylindrus: Shell thin, purple; basal keel strong. 



var. rubella: Smaller, bright red. 

 No. 16. U. zonata: Shell brownish-pink or purple, with a 



white sutural band. 



12. U. PROCERA (C. B. Adams). PI. 29, figs. 21-24. 



Shell shortly rimate, slender, the lower three-fifths cylin- 

 dric, upper portion slowly tapering, the apex broadly trun- 



