134 



UROCOPTIS OF JAMAICA. 



size and shape than the Maroon Town shells, conforming to a 

 narrowly cylindric type, about 21 by 5.7 mm. A few strag- 

 glers have been taken with the small form of U. zonata, at 

 Mackfield, Westmoreland, by Mr. Jarvis ;fig. 20). 



The area no. 14 on map 2 is the metropolis of U. dubia, but 

 according to Mr. Jarvis it occurs in small numbers a good 

 distance from this center. 



14. U. AMBIGUA (C. B. Adams). PI. 29, figs. 25-32. 



Shell cylindric, moderately tapering above, rather widely 

 truncate, thin, but usually stronger than U. cylindrus; rose- 

 pink or pink-brown. Surface usually shining, finely and 

 closely, obliquely striate. Whorls 7-10, varying from slightly 

 to distinctly convex, the last whorl shortly free in front, 

 rounded beneath, except behind the lip, where there is a short 

 keel. Aperture transversely oval, the peristome continuous, 

 whitish or isabelline, expanded and reflexed, the upper margin 

 straightened. Internal pillar slender and straight or nearly 

 so. 



Length 23.6, diam. 7.4 mm. 

 Manchester. 



Length 20, diam. 7.5 mm. ; whorls 

 Manchester. 



Length 19, diam. 6.5 mm. 

 Manchester. 



Length 26, diam. 8.5 mm. ; whorls 8. 

 Chester. 



Length 18.5-20.5, diam. 7 mm. ; whorls 7. 

 Manchester. 



Jamaica: N.-W. Clarendon and southern Trelawny, Man- 

 chester and St. Elizabeth parishes. Map no. 2, area 8, 8 a 

 and 8 b, but far more abundant in area 8. 



Cylindrella ambigua C. B. A., Contrib. no. 2, p. 21 (Oct., 

 1849). C. rosea var. ambigua C. B. A., Contrib., p. 183, no. 

 174 d (1851). C. rosea Chemnitz, SOWERBY, Conch. Icon., 

 xx, pi. 2, f. 11. C. rosea Pfr., DESHAYES, in Fer., Histoire, p. 

 225, pi. 164, f. 4-6 (enlarged). HENDERSON, Nautilus, viii, 

 p. 19, no. 94; and of Jamaican and American collectors gen- 



whorls 



6%. 



whorls 1%. 



Williamsfield, 

 Williamsfield, 

 Williamsfield, 

 Pratville, Man- 

 Mandeville, 



