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^. 



Sph^rium /EQUAToriale Clessin, Malakozoologische Blatter, n. F., I, 

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

 Rio Pedro, Val de Chillo, Ecuador. Length 9, alt. 6, diam. 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. 

 SphcBriiun baJiieuse Spix, Prime, Monograph of American Corbi- 

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

 Bahia, Brazil. 

 Eupera modioliformis (Anton). SphcEvimn modiolifornie Anton, Prime, 

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

 aniim Bgt., 1855. Pisidium diapliaimm Hald., 1841. 

 Venezuela, Brazil. 

 Eupera tumida (Clessin). Limosina tiimida Clessin, Syst. Conchylien 

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

 Bahia, Brazil. 

 Pisidium magellanicum (Dall). Corneocyclas viagellanictts Dall, Bull. 

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

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

 Pisidium observationis Pils. See below. 

 Pisidium patagonicum Pils. See below. 



Pisidium sterkianum Pils., Proc. Acad. Nat. Sci. Phila., 1897, p. 291, 

 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 

 pulcJiclla d'Orbigny, Voy. dans I'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- 292, pi. 6, 

 figs. 17-20. 



