262 UROCOPTIS, S. G. GONGYLOSTOMA. 



maining 10-13, the upper ones flat, lower convex, the last 

 whorl shortly free, rib-striate anteriorly, the base with a 

 thread-like keel. Aperture a little oblique, subcircular, the 

 peristome continuous, narrowly reflexed throughout. Length 

 15-17, diam. 4-4.5 mm.; diam. of aperture 2.66 mm. (Pfr.). 



Eastern Cuba: Manzanillo; Bayamo (Gundlach). 



Cyl. ventricosa Gundl. mss., PFR., Malak. Bl., iv, 1857, p. 

 175, no. 7 ; Monogr., iv, p. 693 ; Novit. Conch., p. 250, pi. 63, 

 f. 22-25; Monogr., vi, p. 362, var. abbreviata. ARANGO, Con- 

 trib., p. 107. SOWERBY, C. Icon., xx, pi. 3, f. 17. C. abnor- 

 mis Gundl., POEY, Memorias, ii, pp. 61, 92 (no description). 



Distinguished by the white and corneous-brown marbled 

 coloration and smooth surface, the tendency to be inflated 

 above the middle, and the rather stout axis, which has one 

 compressed lamella, weakly denticulate above, with a low 

 spiral swelling or cord above it. Under a strong lens the 

 upper half of the shell is seen to be densely sculptured with 

 extremely fine, straight striae. 



Pfeiffer's original description is given above, and his 

 figures copied, pi. 58, figs. 59, 60. More slender forms also 

 occur at Manzanillo, pi. 58, fig. 56, measuring, length 13.5, 

 diam. 3.6 mm. ; whorls 9%, or a little smaller. 



Var. abnormis ('Gundl.'). PL 58, figs. 57, 58. 



Shell short and obese, the spire much swollen above the 

 middle, then rapidly tapering to the truncation; the rejected 

 portion being slender, as in typical ventricosa. Other char- 

 acters as in ventricosa. 



Length 11, diam. 5 mm. ; whorls 7. 



Length 12, diam. 5 mm. ; whorls 8. 



Length 11.7, diam. 4 mm.; whorls 10 (8 to the plug). 



This form also occurs at Manzanillo. Sometimes some of 

 the whorls overhang at the sutures; and there is usually a 

 whorl or more of the empty, subcylindric adolescent shell 

 retained above the plug. Sowerby's figure of ventricosa 

 represents this variety. Var. abbreviata Pfr. (not of Des- 

 hayes) is a synonym. 



