272 TJROCOPTIS, S. G. GONGYLOSTOMA. 



Western Cuba: Camoa (Arango). 



Similar to U. cyclostoma in shape, but differing by the 

 smooth or nearly smooth exterior and the biplicate axis. 

 In U. gracillima the cylinder is wider above, the whorls are 

 conspicuously flatter, and the neck is longer and strongly 

 sculptured. 



155. U. PORRECTA (Gould). PL 62, figs. 26, 27, 28. 



"Shell very slender and delicate, fusiform, translucent, 

 somewhat enlarged at the tip. Surface faintly tessellated 

 with subquadrate spots of opaque white. Whorls about 24, 

 about 8 of which are usually broken from the summit; the 

 others are very slightly convex, smooth; the last whorl is 

 disjoined from the penultimate, and stretched out so as to 

 take nearly the direction of the axis of the shell, and to bring 

 the plane of the aperture nearly at right angles with it ; this 

 last whorl is also covered with minute, close-set ribs. Aper- 

 ture circular, with the peristome broadly and roundly everted. 

 Length three-fifths inch, breadth seven-hundredths inch" 

 (Old.). 



Western Cuba: Retire, a coffee estate in the district of 

 Sumidero, near Coliseo, 20 or 25 miles s.-e. of Matanzas 

 (Bartlett) ; Limonar and Caobas, near Matanzas (Gundlach). 



Pupa (Siphonostoma) porrecta GLD., Boston Journ. of Nat. 

 Hist., iv, p. 490, pi. 24, f. 12 (1844). Cylindrella porrecta 

 Gld., PFR., in Philippi, Abbild., ii, p. 50, pi. 2, f . 10 ; Monogr., 

 ii, p. 372; iii, 576; iv, 707; vi, 384; Conchyl. Cab., p. 53, pi. 

 6, f. 1-3. SOWERBY, C. Icon., xx, pi. 11, f. 100. ARANGO, 

 Contrib., p. 123. 



Gould's very good description is given above. Specimens 

 with the apex entire have from 19 to 24 whorls. Often some 

 of the earlier ones are deciduous, as in fig. 28. The last 

 whorl has a more or less distinct but wide and obtuse basal 

 keel, above which it is noticeably contracted. In one of the 

 specimens I received from Gould (fig. 28) this is especially 

 well developed. The last whorl may be either very delicately 

 rib-striate, or somewhat coarsely so. The axis is slender and 

 simple. In some specimens the opaque white spots are faint 





