UROCOPTIS, S. G. ARANGIA. 163 



Length 35, diam. 8 mm. (Pfeiffer's type). 



Length 35.5, diam. 7 mm., whorls 16. 



Length 32, diam. 6.3 mm., whorls 14%. 



Eastern Cuba: Various localities in Guantanamo district, 

 the typical form at Monte Libano (Gundlach). 



Cyl. soiverbyana PFR., P. Z. S., 1846, p. 116 ; Phil., Abbild., 

 ii, p. 217, pi. 1 (Achat. et Cyl.), f. 13 (April, 1847) ; iii, p. 18, 

 pi. 3, f . 12 ; Monogr., ii, p. 372 ; iii, 568 ; iv, 697 ; vi, 366 ; viii, 

 431 ; Conchyl. Cab, p. 15, pi. 2, f . 24, 25 ; Malak. Bl, vi, 1859, 

 p. 95. SOWERBY, Conch. Icon., xx, pi. 3, f. 20. ARANGO, 

 Contrib, p. 108. CROSSE, Journ. de Conchyl, 1890, p. 219. 

 Urocoptis (Arangia) sowerbiana PILS. & VAN., Proc. A. N. 

 S. P. 1898, p. 275, pi. 18, f. 20. 



This species is quite variable in size and number of whorls 

 as well as in the shape of the aperture. The single strong, 

 smooth plait of the axis is characteristic. A variety found 

 by Gundlach at the plantation "Romanic," Monte Toro, is 

 smaller, with 11-12 whorls, length 22, diam 7*/ 2 mm. (fig. 24). 



Var. montetoronis n. v. PI. 44, fig. 30. 



Small, rapidly tapering, the basal keel weak or subobsolete. 

 Whorls about 9y>. Length 17 y 2 , diam. 5 mm. This form 

 occurs at various plantations at Monte Toro. A specimen 

 with entire spire, received by Pfeiffer, has 18 whorls, and 

 measures 18 mm. long, 4^ wide. 



38. U. MONTICOLA ( Weinland) . PI. 44, figs. 25, 26, 27. 



Shell subcylindric, usually widest above the middle, or the 

 lower two-thirds may be of equal diameter, tapering to a 

 rather wide truncation above; thin; pale brownish; surface 

 lustreless, sculptured with widely-spaced, rather strong, arcu- 

 ate thread-like riblets, which are usually a little enlarged, as 

 though a drop had run down, at suture below and on the basal 

 keel, below which striae replace them. Whorls 13-14, narrow 

 and somewhat convex, the last not free in front, strongly 



irinate below, concave on each side of the keel. Aperture 

 )bliquely short ovate; peristome rather narrowly reflexed, 



lortly adnate above. Axis having a single strong spiral 



