560 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



lar posteriorly. Streams in the pampas south of Buenos Aires as 

 far as Bahia Blanca, especially in the Rio Salado and Arroyo Salado 

 in 30° S. lat. Hydrobia parchappiiV)otx\VLg, Bol. Acad. Cienc. Cor- 

 doba, VII, 472. 



LiTTORiDiNA KUESTERi (Strobel). Hydrobia kiisteri Strobel, Mater. 

 Malac. Argent., 1874, p. 61, pi. 2, fig. 6. 4X2.5 mm., 5 whorls, 

 to 3.5 X 2-2.5 ^^'^^- San Carlos ed Aguanda, province of Mendoza, 

 in stagnant water. Hydrobia ki/sfcn var. cordillcrce Strobel, t. c, 

 p. 61, pi. 2, fig. 7. 3X1.5-2.5x1-33 mm., 4>^ whorls. Sierra 

 de Mendoza. 



LiTTORiDiNA AMEGHiNi (Doering). Hydrobia ameghiui Doering, Bol. 

 Acad. Cienc. Cordoba, VII, pp. 466, 469. 7-9X3.5-4 mm., whorls 

 7>^ . Pampean formation, Lujan, Argentina. 



LiTTORiDiNA occiDENTALis (Docring). Hydvobia occiden talis Doering, 

 t. c, pp. 466, 471. 6x2.7 mm., whorls 6. San Luis, Mendoza, 

 San Juan, Santiago, Argentina. 



LiTTORiDiNA MONTANA (Doering). Hydrobia moiitaiia Doering, t. c, 

 pp. 467, 473. 4.5x2 mm., whorls 6. Sierras de Cordoba and S. 

 Luis, Argentina. 



LiTTORiDiNA GLABRA (Tryon). Hydrobia glabra Tryon, American Jour- 

 nal of Conchology, I, p. 222, pi. 22, f. 12. Bolivia. 



LiTTORiDiNA cuMiNGii (d'Orbigny). Paliidina citmiugii d'Orb., Mag. de 

 Zool., 1835, p. 30. Palitdestrina cinnifigii d'Ovh., Voy., p. 385, pi. 47, 

 figs. 14-16. 6X2 mm., whorls 6. In fresh-water streams near 

 Callao and at Valparaiso. 



LiTTORiDiNA ATACAMENSis (Philippi). Paludiua atacanicnsis Philippi, 

 Reise durch die Wiiste Atacama, i860, p. 185, Taf. 7, fig. 15. Length 

 \\ lines, whorls 5. Tilopozo, Chili, in about 23°, 20' S. lat. 



LiTTORiDiNA POPOENSis (Bavay). Paludestrina popociisis Bavay, Bull. 

 Soc. Zool. France, 1904, p. 154, fig. 5. Conic, 5x2.5-3.5 mm., 

 with 6 to 7 rounded whorls. Lake Popo, Bolivia. 



LiTTORiDiNA cuzcoENSis n. sp. (figs. lo, ii). The shell is minutely 

 perforate or rimate, thin, corneous-white, smooth and glossy. Spire 

 straightly conic, whorls 6, moderately convex, the last evenly rounded. 

 Aperture ovate, slightly oblique. Peristome thin and simple. 



Fig. 10. Length 4.9, diam. 2.5, length of aperture 1.8 mm. (typical). 

 " II. " 4.8 " 2.2 " " 1.6 " (slender phase). 



