UROCOPTIS, S. G. IDIOSTEMMA. 171 



Length 13.5, diam. 3 mm. ; whorls 12. 



Length 16, diam. 3.3 mm. ; whorls 13. 



Eastern Cuba : near Santiago, in the districts Enramada and 

 Corralillo, under stones; also Monte Toro, west of Yateras, 

 somewhat larger specimens (Gundlach) ; plantation El Coco, 

 in Sagua de Tanamo (Arango) ; in the north reported from 

 Mayari, Barajagua and Cayo del Rey (^Vright). 



Cyl. intusmalleata Gundlach, PFR V Malak. Bl. v, 1855, p. 

 186; vi, 1859, p. 97; ix, p. 131. PPR., Monogr., iv, p. 705. 

 SOWERBY, C. Icon, xx, pi. 7, f. 64. POEY, Memorias ii, p. 93. 

 AKANGO, Fauna, p. 122. CROSSE, J. de C., 1890, p. 235. Cyl. 

 (Scalatella) intermalleata SCHAUFUS in Paetel. Catal., p. 68. 



The ribs are narrower and closer together than in U. 

 fastigiata, which is moreover a longer shell. U. uncata has 

 the ribs more swollen on the upper part of the shell; and it 

 differs from both in the internal structure. Z7. geminata is 

 the most closely allied species, but in that the ribs are less 

 slender and less regular, the intervals are more finely striate, 

 and the internal column, while of the same type, differs 

 conspicuously in detail of structure. U. interrupta is an ex- 

 ternally very similar species. Gundlach notes that about 10 

 whorls are lost by the adult. 



This species ranges across the island from north to south. 



45. IT. FASTIGIATA ('Gundl.' Pfr.). PL 45, figs. 36-41. 



Shell subulate, gray-white, usually truncate but sometimes 

 retaining the dead-white early portion. Deciduous whorls 

 finely striate, the later of them and the earlier permanent 

 whorls having nodules above and below the sutures; on the 

 greater part of the shell these become ribs, which may be 

 either narrow, and weaker in the middle, or very stout and 

 continuous ; and though more or less extensively hollow, they 

 are but rarely broken. On the last whorl the ribs are usually 

 interrupted and dislocated. Suture deep, the ribs more or 

 less continuous across it. Base flattened, somewhat concave 

 below the peripheral angle. Last whorl free in front. Aper- 

 ture obliquely ovate, narrowed at the outer basal angle. Peris- 

 tome thin, expanded, subreflexed. Internal column rather 



