250 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



vertical aperture is ovate, pointed above. The peristome is double 

 consisting of an inner peritreme but slightly produced, and an outer 

 peritreme moderately expanded on the outer margin but considerably 

 so on the inner, where it is recurved and bent back partially to conceal 

 the umbilicus and then becoming adnate to the penultimate whorl, 

 it again expands above the aperture into a deeply laminated pointed 

 extension and bent back from the plane of the aperture. From this 

 upper expansion and back of it projects a siphonal tube, which ex- 

 tends downward between the last and penultimate whorls and opens 

 into the umbilical space. This tube communicates with the interior 

 of the last whorl through the opening just back of the aperture in the 

 upper angle of the whorl. The operculum is normal. 



Type.— Oat. No. 314945, U.S.N.M., a female specimen, comes from 

 the Circulo cave in the Province of Camaguey, Cuba, and measures: 

 Length, 13 mm.; greater diameter, 9 mm.; lesser diameter, 7 mm.; 

 length of aperture within, 5 mm.; width of aperture within, 3.5 mm. 



Measurements of other specimens are as follows: Male, length, 

 9.75 mm.; greater diameter, 8.1 mm.; lesser diameter, 5.75 mm.; 

 length of aperture within, 4 mm.; width of aperture within, 3 mm. 

 Female, length, 16.5 mm.; greater diameter, 11.25 mm.; lesser di- 

 ameter, 8.75; length of aperture within, 6 mm.; width of aperture 

 within, 5 mm. 



Specimens were collected in the following localities in the Province 

 of Camaguey, Cuba: Cerro de Tuabaquey, El Cercado, San Francisco, 

 Cueva del Circulo, La Loma, Corral de Cairije, Los Cangilones, etc., 

 all in the eastern part of the Sierra de Cubitas, by Biosca, Torre, 

 Henderson, Simpson, Sifontes, and Salustio Garcia. This species 

 was first found by Federico Biosca, professor of natural history in 

 the Institute of Camaguey. 



This subspecies differs from the typical subspecies chiefly in the 

 lesser expansion of the peristome over the umbilicus and in its greater 

 color variation. 



OPISTHOSIPHON (OPISTHOSIPHONA) PAREDONENSE, new species. 



Plate 38, figs. 9-11. 



The shell is oblong-ovate, quite solid, umbilicated, truncated, 

 leaving three and a half to four convex whorls. The last whorl is 

 solute for a distance of about two millimeters. The suture is deep 

 and irregularly crenulate. The color range is from a pale russet to 

 purplish brown, sometimes unicolored, but generally encircled below 

 the periphery by a band of dark purple. The sculpture consists of 

 axial threads more widely spaced upon the early postnuclear whorls 

 and increasing in number upon the succeeding whorls. On the last 

 whorl the riblets are densely crowded (eight to nine to one millimeter) . 



