256 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 59. 



This species seems to be more generally distributed throughout the 

 Cubitas range than any other of the group. In the various localities 

 from winch it has been taken some divergence in minor details is 

 noted, but the two following subspecies account for the major differ- 

 ences in the shell characters. 



OPISTHOSIPHON (OPISTHOSIPHONA) BIOSCAI BIOSCAI, new subspecies. 



Plate 40, figs. 4 and 6. 



This, the typical subspecies, is determined by the following three 

 characters: The maximum expansion of the peristome, winch almost 

 wholly covers the umbilicus, though never quite closing it; the coarser 

 axial riblets (five to the millimeter), winch are more strongly devel- 

 oped in the upper and lower portions of each whorl, and, finally, the 

 uniformly larger size of the shell. 



Type.— A female specimen, Cat. No. 314952, U.S.N.M., from El 

 Cercado measures: Length, 15 mm.; greater diameter, 9.25 mm.; lesser 

 diameter, 7.5 mm.; length of aperture within, 4.5 mm.; width of 

 aperture within, 3.75 mm. A male specimen measures: Length, 11.75 

 mm.; greater diameter, 7.75 mm.; lesser diameter, 6 mm.; length of 

 aperture within, 3.75 mm.; width of aperture within, 3 mm. 



Specimens were collected at El Cercado and Los Cangilones, San 

 Francisco, Paredones, Paso de la Escalera, de las Cocinas, de las 

 Trincheras, all in the Cubitas Mountains, Camaguey Province, Cuba, 

 by Torre, Henderson, Simpson, Biosca, and Sifontes. 



OPISTHOSIPHON (OPISTHOSIPHONA) BIOSCAI TERSUM, new subspecies. 



The shell differs from the typical subspecies in being uniformly 

 smaller, in the finer axial sculpture (ten riblets to the millimeter), in 

 the equal prominence of these axial riblets over the entire portion 

 of each whorl and in the lesser expansion of the peristome over the 

 umbilical region. In many cases the expanded peristome hardly 

 more than touches the whorl above and is never adnate to it. 



Tijpe.—A female, Cat. No. 314953, U.S.N.M., from "La Providen- 

 cia" farm, measures: Length, 11.7 mm.; greater diameter, 7.2 mm.; 

 lesser diameter, 6 mm.; length of aperture within, 3.8 mm. : width of 

 aperture within, 3 mm. A male specimen measures: Length, 9.5 mm. ; 

 greater diameter, 7 mm. ; lesser diameter, 5.5 mm. ; length of aperture 

 within, 3.5 mm. ; width of aperture within, 2.9 mm. 



This subspecies was collected by Torre, Henderson, and Simpson 

 at "La Providencia, " El Cercado, entrance to Paso de Lesca, on 

 a small knoll; Camaguey Province, Cuba. 



OPISTHOSIPHON (OPISTHOSIPHONA) SALUSTII, new species. 



Plate 40, figs. 5 and 7. 



The shell is ovate-conic, rather thin but strong, widely umbilicated, 

 the apex decollated, leaving three and a half convex whorls, the last 

 being shortly solute. The color is a pale straw with three to seven 



