604 PATAGONIAN EXPEDITIONS : ZOOLOGY. 



Montevideo, Uruguay. Length 2.6, alt. 2.4, diam. 2 mm. Near the 

 following species, but shorter. 

 PISIDIUM GLOBULUS Clessin, Malakozoologische Blatter, n. F., X, 1888, 



P- ! 73- 

 Taguara, State of Rio Grande do Sul, Brazil. Length 3, alt. 2.5, 



diam. 2 mm. 



PISIDIUM CHILIENSE (d'Orbigny). Cyclas chiliensis d'Orb., Voy. dans 



1'Amer. Merid., Moll., p. 568, pi. 83, figs. 11-13. 

 Concepcion, Chili. Length 5 mm. 



PISIDIUM FORBESII (Philippi). Cyclas forbesii Phil., Malakozoologische 

 Blatter, XVI, 1869, p. 41. Pfeiffer, Novitates Conchologicae, III, p. 

 489, pi. 105, figs. 15-17. 



Bolivia alta (Forbes) ; Lake Titicaca (Raimondi). Length 7.5, alt. 

 6.5, diam. 4 mm. 

 PISIDIUM BOLIVIENSE Sturany, Nachrichtsblatt d. deutschen Malako- 



zoologischen Gesellschaft, 1900, pp. 56, 57, Taf. i, figs. 1-7. 

 Bolivia, at Machacamac, between Chililaya and La Paz (Countess von 

 Bayern). 



Length 7.8, alt. 6.4, diam. 3.6 mm. 

 " 6.7 " 5.5 " 3.2 " 

 " 5.7 " 4.7 " 2.7 " 



Near P. forbesii, but lower, more oval, with less projecting beak. 

 PISIDIUM LAURICOCH^ (Philippi). Cyclas lauricocha Phil., Malak. Blatter, 

 XVI, 1869, p. 41. Pfeiffer, Novitates Conchologicae, III, p. 489, pi. 

 105, figs. 12-14. 



Lake Lauricocha, at head of the Maranon River. Length 7, alt. 6, 

 diam. 4 mm. 



PISIDIUM WOLFII Clessin. P. wolfii Clessin in Miller, Malak. Blatter, n. 



F., I, 1879, p. 178, Taf. n, figs. 7-9. Clessin, Conchylien Cabinet, 



Cycladeen, p. 268. 



Rio Pedro, Val de Chillo, Ecuador. Length 5, alt. 4, diam. 2.5 mm. 

 Very inequilateral. 



PISIDIUM DAVISI (Bartsch). Corneocyclas davisi Bartsch, Proc. U. S. Nat. 



Mus., XXXIII, 1908, p. 681. 

 Chanchan River, Ecuador. Length 5, alt. 4, diam. 2.7 mm. 



