172 UROCOPTIS, S. G. IDIOSTEMMA. 



stout, being thickened by a wide spiral band which leaves a] 

 groove above and below in each whorl, is somewhat concave 

 in the middle, and is obliquely, weakly costate (fig. 41). In 

 the tapering upper portion it is smooth and somewhat sinuous. 



Length 18.5, diam. 3 mm.; whorls 16. 



Length 21.3, diam. 2.7 mm. ; whorls 23. 



Length 31, diam/3.3.; whorls 36-38 (Pfr.). 



Length 14.5, diam. 3. ; whorls 12. 



Eastern Cuba: Baracoa, Yunque, Mata, on stones (Gund- 

 lach). 



Cyl. fastigiata Gundlach mss., PFR., Malak. Bl. vii, 1860, 

 p. 20; Novit. Conch, p. 263, pi. 65; f. 23-25; Monogr., vi, p. 

 382. SOWERBY, Conch. Icon, xx, pi. 4, f. 34. ARANGO, 

 Fauna, p. 121. 



The size and number of whorls retained varies within wide 

 limits, and the sculpture, as the figures show, is not less vari- 

 able. The internal column is of the same general type as that 

 of U. geminata, but far less strongly developed, more as in 

 U. lateralis, which though conspicuously diverse, is the most 

 closely allied species. V. fastigiata has been distributed un- 

 der the apparently ms. name C. lineata Gundl. It is known 

 from the district of Baracoa only. 



46. U. LATERALIS ('Paz' Pfr.). PI. 46, figs. 54-59. 



Shell very slender, subulate, light brown or purplish brown, 

 tapering from the base to the narrow truncation, or rarely 

 retaining all or part of the abandoned white early whorls. 

 Surface lusterless, very finely arcuately striatulate, the median 

 and later whorls more or less distinctly crenate below the 

 suture, the last two or three whorls usually crenate above the 

 suture also, and with a row of small nodes along the basal 

 angle. Base fiat. Last whorl becoming free, with a rather 

 long straight descending neck. Aperture obliquely oval, the 

 peristome expanded and narrowly reflected. Internal column 

 rather slender, thickened by a spiral callus which is obliquely, 

 closely ribbed, a little concave and smoother in the middle, 

 and separated by grooves from the partitions above and be- 

 low (pi. 46, fig. 56). 



