PILSBRY: NON-MARINE MOLLUSCA OF PATAGONIA. 603 



south of the Equator, compiled in the course of work on Patagonian forms, 

 is here given for the convenience of those who have occasion to study the 

 group. 



LIST OF SOUTH AMERICAN SPH^ERIID^E. 



SPH^ERIUM ^QUATORIALE Clessin, Malakozoologische Blatter, n. F., I, 



1879, p. 176, Taf. n, figs. 4-6. 



Rio Pedro, Val de Chillo, Ecuador. Length 9, alt. 6, diafn. 3.5 mm. 

 Referred by Clessin to the group Corneola. 

 MUSCULIUM ARGENTINUM (d'Orbigny). See below. 

 MUSCULIUM PATAGONICUM Pils. See below. 



EUPERA BAHIENSIS (Spix), Testacea Brasil., 1827, p. 32, pi. 25, figs. 5, 6. 

 Sphcerium bahiense Spix, Prime, Monograph of American Corbi- 

 culidae, 1865, p. 53, fig. 52. 

 Bahia, Brazil. 



EUPERA MODIOLIFORMIS (Anton). SpJuzrium modioliforme Anton, Prime, 

 Monograph American Corbiculidae, 1865, p. 54. Pisidium moqttini- 

 amim Bgt., 1855. Pisidium diaphanum Hald., 1841. 

 Venezuela, Brazil. 

 EUPERA TUMIDA (Clessin). Limosina tumida Clessin, Syst. Conchylien 



Cabinet, Cycladeen, p. 246, pi. 46, figs. 5-8. 

 Bahia, Brazil. 

 PISIDIUM MAGELLANICUM (Dall). Corneocyclas magellanicus Dall, Bull. 



Mus. Comp. Zool., vol. 43, October, 1908, p. 411. 

 Magellan Straits, in 61 fathoms ; Rio Chico to base of the Andes. 

 PISIDIUM OBSERVATIONS Pils. See below. 

 PISIDIUM PATAGONICUM Pils. See below. 

 PISIDIUM STERKIANUM Pils., Proc. Acad. Nat. Sci. Phila., 1897, P- 2 9 J > 



pi. 6, figs. 1-4. 



Montevideo, Uruguay. Length 6, alt. 5, diam. 3.8 mm. 

 PISIDIUM DORBIGNYI Clessin, Conchylien Cabinet von Martini und 

 Chemnitz, 2te Aufl., Cycladeen, 1879?, p. 62 (new name for Cyclas 

 ptdchella d'Orbigny, Voy. dans 1'Amer. Merid., Moll., p. 568, pi. 83, 

 f. 8-10, not of Jenyns). 

 Maldonado, Uruguay. Length 3 mm. 



PISIDIUM VILE Pilsbry, Proc. Acad. Nat. Sci. Phila., 1897, P- 2 9 2 P^ 6, 

 figs. 17-20. 



