264 UROCOPTIS, S. G. GONGYLOSTOMA. 



tapering to a narrow truncation above; whitish with irregu- 

 larly spaced, wedge-shaped, curved corneous streaks. Sur- 

 face slightly shining, sculptured with oblique, thread-like 

 white riblets separated by intervals two or three times their 

 width. Whorls convex, the last free, descending in a rather 

 long neck. Aperture oblique, circular, the peristome ex- 

 panded and subreflexed throughout. Axis slender, slightly 

 sinuous, being encircled by a low spiral thread near the base 

 in each whorl. 



Length 12, diam. 2 mm. ; whorls 



Length 13, diam. 2.1 mm. ; whorls 



Length 12-14, diam. 2 mm.; whorls 15 (Pfr., type). 



Cyl. hilleri PFR., Malak. BL, ix, 1862, p. 132 ; Monogr., vi, 

 p. 387; Novit. Conch., p. 457, pi. 100, f. 14-16. ARANGO, 

 Contrib., p. 125. 



Eastern Cuba: Picote (Jeaiineret), and Sagua de Tanamo 

 (Wright), in Mayari. 



''In color and sculpture this species stands nearest to U. 

 wrighti, but is much more slender, somewhat like U. porrecta 

 in form, truncate, the whorls are flatter and much more 

 closely striate, and the striation continues even to the aper- 

 ture, while in rageli it is stronger and more widely spaced 

 on the neck" (Pfr.). U. hilleri is smaller, more closely stri- 

 ate and less lengthened than U. wrighti. 



147. U. WRIGHTI (Pfeiffer). PI. 59, figs. 83, 84, 85, 86. 



Shell very slenderly fusiform, the middle third nearly 

 cylindric, the ends slowly tapering; narrowly truncate; thin; 

 brownish-corneous with some white streaks, or whitish with 

 corneous markings. Surface glossy, sculptured with low, 

 narrow whitish, widely-spaced riblets, which are oblique and 

 arcuate. Whorls moderately convex, the last free in a long, 

 descending, forwardly curved neck. Aperture subcircular, 

 the peristome evenly expanded, somewhat reflexed through- 

 out. Axis slender, somewhat sinuous, encircled by a low 

 thread below, which in the median and upper whorls is a 

 little stronger, and bears delicate filament-like spines. 



Length 20, diam. 2 mm. ; whorls 20. 



