PILSBRY: NON-MARINE MOLLUSCA OF PATAGONIA. 561 



Cuzco, Peru (H. von Ihering). 



This species evidently stands close to L. popoensis Bavay, of the saline 

 Bolivian Lake Popo ; but the spire seems to be of a more turrite shape, 



FIG. 10. FIG. ii. 



the last whorl comparatively shorter in L. popoensis, which moreover belongs 



to a different drainage. 



Compared with L. culminea of Lake Titicaca, this species differs by the 



less attenuate spire and fewer whorls. L. cuzcoensis is not very closely 



related to the Titicaca species. 



LITTORIDINA NEVENI (Bavay). Pyrgula neveni Bavay, Bull. Soc. Zool. 

 France, 1904, p. 155, fig. 6. Last three whorls strongly carinate. 

 5X3 mm. with 6^ whorls. Lake Titicaca. 



LITTORIDINA ANDICOLA (d'Orbigny). Paludina andicola d'Orb., t. c, p. 

 29. Pahidestrina andicola d'Orb., Voy., p. 385, pi. 47, fig. 13. Bavay, 

 Bull. Soc. Zool. France, 1904, p. 153, fig. 2. 8X3 mm. with 8 flat 

 whorls, the last acutely carinate. Lake Titicaca. 



Littoridina andicola, ecarinate form : Paludestrina culminea d'Orb., Voy., 

 p. 386,, pi. 47, figs. 10-12. 6X3 mm., whorls 7, somewhat convex. 

 Lake Titicaca. 

 Some specimens of the L. culminea type, collected by A. Agassiz in 



Lake Titicaca, are subangular at the periphery, and therefore somewhat 



intermediate between L. culminea and L. andicola. Bavay has figured a 



series of shells showing the intergradation of these supposed species. 



LITTORIDINA GUADICHAUDII Souleyet, Voyage la Bonite, Zoologie, II, p. 

 565, pi. 31, figs. 31-33 (living animal, shell and operculum), pi. 32, 

 figs. 9-19 (soft anatomy). 5X3 mm., 6 whorls. River of Guaya- 

 quil, Ecuador. 



LITTORIDINA ECUADORIANA (Miller). Paludestrina ecuadonana Miller, 



