132 UROCOPTIS OP JAMAICA. 



cate ; thin ; ' ' reddish or yellowish-brown ; ' ' surface but slightly 

 shining or lustreless, very densely and finely striate. Whorls 

 about 91/0 (71/0 to 11), slightly convex, separated by a well 

 marked suture, the last whorl shortly free- in front, having a 

 strong spiral carina at the base, extending upon the lip. 

 Aperture oblique, subcircular, the peristome white, expanded 

 and reflexed, slightly guttered at the termination of the basal 

 carina. Internal axis white, slender and straight. 



Jamaica: Interior of Clarendon, the most strongly marked 

 form very local, at Teak Pen and a few miles around, where 

 it is abundant (Jarvis) ; but smaller forms extend westward 

 to Clarendon Park, Clarendon, and Peace River, Manchester 

 (Jarvis). Map no. 2, area 7. 



Cylindrella procera C. B. A., Contrib. to Conch., no. 7, p. 

 102 (April, 1850). 



More slender and lengthened than U. ambigua, and with 

 the basal keel more pronounced; moreover, the typical procera 

 is not rose-colored, but tawny. But the specimens from Man- 

 chester are in some cases difficult to separate from ambigua. 

 The ranges of the two overlap, and there is probably pretty 

 complete intergradation. The area marked for procera on 

 the map defines only the more typical form, excluding the 

 rather wide range westward of varietal modifications. 



Figures 21, 22 represent typical specimens from Adams, 

 exact locality unknown. At Teak Pen, in central Clarendon 

 (pi. 29, figs. 23, 24), the shells are still longer: 



Length 32, diam. 7.7, whorls 12. 



Length 29, diam. 7.5, whorls 10i/ 2 . 



Length 24.7, diam. 6.5, whorls 10. 



Color dull or rather dark red-brown; basal keel strong; 

 internal pillar stronger and shell decidedly thicker than in 

 the typical form. 



At Clarendon Park, near the western edge of Clarendon, 

 and at Peace River, Manchester, the shells are small, about 

 24 x 6.5 mm., with 8-9 whorls, a strong basal keel, and more 

 or less roseate color. 



The rejected spire consists of about 13 whorls, the first two 

 smooth and glossy. The outlines are irregular, the spire 



