254 UROCOPTIS, S. G. GONGYLOSTOMA. 



tinuous, broadly expanded, white. Axis encircled with a 

 single sub-basal lamella, and in the intermediate whorls hav- 

 ing a very weakly spiral cord above. 



Length 21, diam. 5.5 mm.; whorls Iiy 3 (Guane). 



Length 20, diam. 4.5 mm.; whorls 12 (Poey, type). 



Western Cuba: Guane, hanging on high rocks (Poey); 

 Teneria and Catalina de Guane (Wright) ; Portales de Guane 

 ( Arango) , all in prov. Pinar del Rio. 



Cyl. cocrulans POEY,, Memorias, ii, p. 37, pi. 1, f. 14. PFR., 

 Malak. BL, v, 1858, p. 7; Monogr., iv, p. 700. ARANGO, 

 Contrib., p. 112. Cyl. cccrulans Poey, SOWERBY, C. Icon., xx, 

 pi. 3, f. 21 (bad). 



Larger than the related forms. At Catalina, a village in 

 Guane district, Pinar del Rio, Wright collected a much 

 smaller, thinner form, often paler in color; length 17, diam. 

 4.2 mm., with lOi/o whorls, to length 13.5, diam. 3.1 mm., 

 whorls 11. 



135 a. Var. INCERTA (Arango). PI. 57, fig. 46. 



Similar to U. coerulans in color and sculpture, but more 

 inflated, the axis simple above the sub-basal lamella; and it 

 retains fewer whorls. 



Length 15.5, diam. 4.6 mm. ; whorls 8%. 



Length 14.5, diam. 4.5 mm.; whorls 8 (Arango, type). 



Length 14, diam. 4.3 mm. ; whorls 8. 



Puerta de la Muralla, in Guane district, prov. Pinar del 

 Rio (Arango). 



Cyl. incerta ARANGO, Proc. A. N. S. Phila. 1881, p. 15, fig. 

 (May 10, 1881). 



Figured from a cotype. It is the merest variety of U. 

 coerulans. 



136. U. CANTEROIANA ('Gundl. ' Arango). 



Differs from C. variegata Pfr. by the more remote riblets 

 and especially the one-lamellate internal column. Length 

 of a truncate specimen 11 to 14, diam. 2 1/2 mm. (Arango). 



La Vigia, Trinidad (Arango). 



