UROCOPTIS, S. G. GONGYLOSTOMA. 273 



or wanting; in others they seem diffused, the whole surface 

 being whitish. Specimens measure, length 13, diam. 1.7 to 

 2 mm. 



156. U. CINEREA (Pfeiffer). PL 65, figs. 11, 12. 



Shell not rimate, slender, cylindric-subulate, truncate; 

 obliquely subarcuately costulate, the riblets stronger and 

 rather flat on the lower whorls; opaque, ashen. Whorls 

 remaining 12, flattened, the last free, descending, subsulcate 

 above, the base obsoletely carinate. Aperture circular, glossy 

 chestnut colored inside; peristome continuous, white, acute, 

 narrowly expanded. Length 14, diam. below the middle 

 2.66, diam. of aperture nearly 2 mm. (Pfr.). 



Cuba. 



Cyl. cinerea PFR., Zeitschr. f . Malak., 1850, p. 75 ; Conchyl. 

 Cab., p. 52, pi. 5, f . 39, 40 ; Monogr., iii, p. 578. 



Known by the original figures and description only. It 

 seems to be a wider shell than U. baculum. 



157. U. SEXDECIMALIS ('Jim.' Pfr.). PI. 62, figs. 36, 37. 



Shell fusiform-subulate, thin, smooth, pellucid, glossy; 

 marbled with white on a corneous ground, or with corneous 

 on white. The spire is very slender above, but enlarged at 

 the tip, the greatest width being below the middle. Whorls 

 but slightly convex, the last becoming free, cylindric and 

 descending, the neck round below, and rib-striate on the back. 

 Aperture circular, oblique, brownish inside, the white lip 

 evenly reflexed. Axis slender, simple and straight. 



Length 10, diam. 1.6 mm.; whorls 17%. 



Length 11, diam. .1.66 mm.; whorls 16-18 (type). 



Western Cuba: Estate Fumero, at Vieja Bermeja, dist. of 

 Cabezas (Jimeno), and coffee plantation of San Luis, at 

 Jaruco (Arango), both in Havana province. 



Cyl. sexdecimalis Jimeno mss., teste Gundlach in litt, PFR., 

 Malak. BL, xi, 1863, p. 9; Monogr., vi, p. 384. ARANGO, 

 Contrib., p. 123. SOWERBY, C. Icon., xx, pi. 15, f. 128. 



Very near porrecta, but smaller and composed of fewer 

 whorls. The aperture is sometimes carried laterally further 

 than in the specimen figured, which was received from Jimeno. 



