ortmann: south American naiades. 



623 



61. Anodontites MORiCANDi (Lea) (1800). 

 Simpson, 1914, p. 1439. 



Synonym : 

 Anodonta hertwigi Von Ihering, 1890, p. 150, PI. 9, fig. 7; 1910, p. 138. 



Von Ihering (1910, p. 138) regards Anodon radiatus Spix (1827) as the young 

 of this species, and in that case, of course, the specific name radiala should supersede 

 that of moricandi. However, T am not convinced that this is right, for those of 

 our specimens which are nearly of tlie size of Spix' original, do not agree with it 

 in shape. They do not have the strongly convex lower margin, and the relative 

 dimensions, chiefly the height, also do not fit. According to Von Ihering, the 

 measurements of radiata arc: Length 70 mm.; Height 36 mm. = 51 pr. ct. of L.; 

 Diameter 20 mm. = 29 pr. ct. L. 



Type-locality. — Bahia, Brazil. 



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

 ing); Rio Paraguassii, Bahia, Brazil (Von Ihering); Rio Pardo, Bahia, Brazil (Von 

 Ihering). 



New Locality. — In a lagoon of Rio Parahyba, Campos, Rio de Janeiro, Brazil 

 (J. D. Haseman coll., June 14, 1908). Six specimens. 



Di.itribution. — Streams of eastern Brazil, from mouth of Rio Sao Francisco in 

 Sergipe southward to Rio Paraliyha in Rio de Janeiro. Known from the rivers 

 Sao Francisco, Paraguassii, Pardo, and Parahyba. 



My s])ecimens agree well with this species. What is regarded as one of its 

 essential characters, the flattening of the disk on the sides, is developed only in 

 larger specimens. My largest specimen shows it distinctly, although not as strik- 

 ingly as Lea's figure. In the smaller ones this is less evident, but even in these 

 the greatest diameter of the shell is in about the middle of the length, not much 

 behind the beaks. 



Measurements. 



