216 UROCOPTIS, S. G. GONGYLOSTOMA. 



four riblets in the space of a millimeter. On the back of 

 the neck they become more crowded, and of course still more 

 so on its front. The axis is rather wide below, and in the 

 penult, and three preceding whorls it bears two equally 

 prominent lamellae, both rather stout, with the edge rounded, 

 but the upper cord is the heavier. In still earlier whorls 

 the upper cord disappears abruptly, and the lower is nar- 

 rower and minutely denticulate at the edge. 



Length 14, diam. 3.4 mm. ; whorls 11. 



Length 11.5, diam. 3.3 mm.; whorls 9^. 



The specimens from Marianao (pi. 54, fig. 70) are larger 

 than the above, longer, often more strictly cylindric. They 

 are like those from the type locality internally, except that 

 the upper lamella persists somewhat further upward. 



Length 17, diam. 3.3 mm.; whorls 12 



Length 14, diam. 3.4 mm.; whorls 



Length 12.5, diam. 3 mm. ; whorls 



They occur there with U. (Cochlodinella) poeyana var. 

 variegata, a more finely striate species but of about the same 

 size. 



85. U. GUTIERREZI ( Arango) . PI. 54, figs. 72, 72, 73. 



"Very closely related to artemisia, but the shape is more 

 cylindrical, and the internal column is bilamellate (as in 

 artemisia), but the laminae are compressed and weak (in 

 artemisice they are strong). " (Arango.) 



Western Cuba: Isabel Maria, in Pinar del Bio (Wright). 



Cyl. gutierrezi AR., Anales de la Real Academia de Cien- 

 cias medicas, fisicas y naturales de la Habana, xii, p. 283, 

 no. 9 (Feb. 15, 1876) ; Contrib., p. 121. 



This speci'es has a cylindrical, truncate shell, the upper 

 third or more frequently the fourth slowing tapering. It 

 is flesh colored and sculptured with whitish thread-like rib- 

 lets separated by intervals fully three times their width; 

 on the very short neck they are generally not more crowded. 

 The aperture is but slightly oblique, brown inside, nearly 

 circular, but the columellar margin is perceptibly less arcu- 



