598 MEMOIRS OF THE CARNEGIE MUSEUM. 



52. Anodontites TRAPEZEA (8pix) (1827). 

 A7iodo7i rotundum and irapezeutn Spix and Wac.ner, 1827, p. 28, PL 20, figs. 1-4. 

 Anodonta rotunda and trapezea Von Ihering, 1890, pp. 142, 145, PL 9, figs. 5, 6. 

 A7iodonta cailliaudi Lea, Obs., X, 1863, PL 45, fig. 297. 

 Anodon cailliaudi Sowerby, XVII, 1867, PL 12, fig. 38. 

 Glabaris rotunda Von Ihering, 1893, p. 59; Simpson, 1900, p. 918. 

 Glabaris trapezea Von Ihering, 1893, p. 57; Nehrino, 1893, p. 163; Von Ihering, 



1910, p. 138. 

 Anodontites rotundus Simpson, 1914, p. 1410. 



D'Orbigny first rooognizod the identity of trapezea and rotunda, and selected 

 the first name. Althougli the specimens from C-orrientes, to which he appHed 

 this name, may not have been the typical trapezea, but a variety or even a species 

 (spixi D'Orbignj^, 1835), his selection of trapezea in preference to rotunda should 

 be accepted. 



Type-locality. — Rio Solimoes (middle Amazon) Brazil. 



Other Localities. — Rio Sao Francisco, Villa Nova, Sergipe, Brazil (Von Ihering, 

 trapezea); Sao Paulo, Brazil (Wagner, rotunda); Rio Piracicaba, Piracicaba, Sao 

 Paulo, Brazil (Von Ihering, trapezea). 



This species, parti}' as rotunda, partly as trapezea, has been reported (D'Or- 

 bigny, Lea, Von Ihering) from the lower Rio Parana (near Corrientes). However, 

 the A. trapezea of D'Orbigny is believed to be a different form or variety {A. spixi 

 D'Orbigny). It is surely allied to trapezea. 



New Localities. — Lagoa de Sacho Grande, Cidade da Barra, Bahia, Brazil 

 (J. D. Haseman coll., December 24, 1907). Six complete shells and four odd (left) 

 valves. Lagoa de Sacho Pequeno, Cidade da Barra, Bahia, Brazil (J. D. Haseman 

 coll., December 24, 1907). Three specimens, one a male with soft parts. Rio 

 Grande, Barreiras, Bahia, Brazil (J. D. Haseman coll., Januarj' 4, 1908). Three 

 males with soft parts. Rio Sao Francisco, Joazeiro, Bahia, Brazil (J. D. Haseman 

 coll., February 28, 1908). One odd (left) valve. 



All these localities are in the drainage of the Rio Sao Francisco. 



Distribution. — The presence of this species in the system of Rio Sao Francisco 

 is established. Since Von Ihering has also cited it as trapezea from the upper 

 Parana (Piracicaba) in Sao Paulo, it must belong to both systems. Farther down 

 the Parana (Corrientes, Argentina) similar shells are present, but apparently 

 slightly different from the tyjje. The original locality is in the Amazon-drainage, 

 but it has not subsequently been found there. 



Characters of the Shell. — Shell of moderate size (maximum length 75 mm.), 



