UROCOPTIS, S. G. COCHLODINELLA. 181 



53. U. MIXTA ('Wright' Pfr.). PL 42, figs. 91, 92. 



Shell cylindric-turreted, the upper half tapering to a nar- 

 row truncation ; rather thin, corneous or pale brown with 

 lighter strice. Surface but slightly shining, sculptured with 

 sinuous, oblique, thread-like riblets, widely and unequally 

 spaced. Whorls about 11, the upper convex, lower somewhat 

 flattened, separated by an impressed suture ; last whorl 

 rounded below, shortly free in front. Aperture oblique, 

 circular, the peristome narrowly expanded, reflexed and wider 

 on the columellar margin. Axis slender and simple. 



Length 14.5, diam, 3.5 mm.; whorls 11 (Pfeiffer's type). 



Length 16, diam. 3 mm. ; whorls ll^s- 



Length 13.8, diam. 2.8 mm. ; whorls 10y 3 . 



Western Cuba: Siigar plantation La Cochinata, at Las 

 Pozas, near the north coast, in dist. of Bahia Honda, prov. 

 Pinar del Rio, under stones (A\ 7 right). 



Cyl. mixta Wright mss., PFR., Malak. BL, xii, 1865, p. 120 ; 

 Monogr., vi, p. 381. ARANGO, Contr., p. 121. 



Closely related to U. illamellata, but narrower, with some- 

 what more spaced and more sinuous riblets. 



54. U. ATROPURPUREA (Arango). PI. 42, figs. 96, 97. 



Shell cylindric, the upper third tapering; rather thin, dark 

 purplc-broivn. Surface somewhat glossy, regularly sculp- 

 tured with fine thread-like rib-striae, which are nearly straight, 

 narrow, and parted by intervals wider than the riblets. 

 Whorls about 9, convex, the last continued free in a rather 

 long, descending round neck. Basal keel faintly indicated 

 or wanting. Aperture slightly longer than wide, subcircular, 

 the peristome white, expanded, reflexed on the upper and 

 columellar margins. Axis slender and straight. 



Length 19, diam. 4.4 mm. 



Length 17, diam. 4 mm. 



Western Cuba : La Jagua, near La Palma, dist. Consolacion 

 del Norte, Pinar del Rio (Arango). 



Cyl. atropurpurea ARANGO, Proc. A. N. S. Phila. 18 12, p. 

 106 (June 27, 1882). 



The dark color, more regular and closer striation and longer 



