No. 2369. NEW MOLLUSKS FROM CUBA— TORRE AND HENDERSON. 251 



At the summit of the whorls, just below the suture, many of the riblets 

 are expanded into hollow bulbs, often several meeting to form one 

 bulb. Spiral sculpture consists only of about twelve low cords within 

 the umbilical region. The aperture is vertical, oval, somewhat 

 pointed above; the peristome is duplex, the inner peritreme is not 

 produced; the outer peritreme is but slightly expanded, evenly so all 

 around in the typical form, not so in another subspecies; above the 

 posterior angle of the aperture the expanded peristome is gathered 

 into a triangular projection ending in a short siphonal tube, which 

 curves backward and then toward the penultimate whorl. The tube 

 communicates with the interior of the shell at a point just back of the 

 aperture in the posterior angle. Operculum typical. Type measure- 

 ments are given under subspecies. 



OPISTHOSIPHON (OPISTHOSIPHONA) PAREDONENSE PAREDONENSE, new subspecies. 



Plate 38, figa. 9-11. 



This, the typical subspecies, is characterized by the even expansion 

 of the peristome about the aperture. It never touches the whorl 

 above. 



Type. — A female specimen, Cat. No. 314946, U.S.N.M., comes from 

 Los Paradones, Camaguey Province, Cuba. It measures: Length, 

 10.75 mm.; greater diameter, 9.4 mm.; lesser diameter, 7 mm.; length 

 of aperture within, 5.5 mm. ; width of aperture within, 4 mm. Another 

 specimen, a male, measures : Length, 10.75 mm. ; greater diameter, 8.15 

 mm.; lesser diameter, 6.7 mm.; length of aperture within, 4.5 mm.; 

 width of aperture within, 3.8 mm. 



Representatives of this subspecies come from Camaguey Province, 

 Cuba at Los Paradones, a narrow pass through the Cubitas range of 

 mountains. They were collected by Salustio Garcia, Pablo Sifontes, 

 Torre, Henderson, and Simpson. 



OPISTHOSIPHON (OPISTHOSIPHONA) PAREDONENSE TRANSITORIUM, new subspecies. 



Plate 39, figs. 1-2. 



A subspecies distinguished from the typical subspecies by reason 

 of the uniformly greater expansion of the peristome on the inner 

 side. This is not, however, carried to the extent sufficient to conceal 

 the umbilicus, but it does touch or impinge upon the next whorl above. 

 All other features are identical. 



Type. — Cat. No. 314947, U.S.N.M., is from the entrance of La 

 Guanaja or Paso del Este, in the Cubitas Mountains, Camaguey 

 Province* Cuba, and measures: Length, 11.8 mm.; greater diameter, 

 8.5 mm.; lesser diameter, 6.75 mm.; length of aperture within, 4.5 

 mm.; diameter of aperture within, 3.5 mm. It is a female specimen. 



Male specimens are smaller. 



