622 



MEMOIRS OF THE CARNEGIE MUSEUM. 



60o. Anodontites trapesialis anserina (Spix) (1827). 

 Simpson, 1914, p. 1430. 



New Locality. — Rio Paraguay, Corumbd, Matto Grosso, Brazil (H. H. Smith 

 coll.). Three right valves. 



I do not propose to go into a lengthy discussion of this form. I merely desire 

 to say that two of my specimens agree very well in shape and size, with the figures 

 given by Spix, while the third more resembles Sowerby's figure (PI. 31, fig. 125). 

 They vary slightly among themselves in the degree of the taper of the anterior 

 end. In all of them the hinge-line is very gently curved, but not sinuous (as in 

 A. exotica). 



The original A. anserina is from the Rio Solimoes, in the province of Amazonas. 



606. Anodontites trapesialis scripta (Sowerby) (1867). 

 Simpson, 1914, p. 1430. 



Simpson unites with this A. bahiensis Kuester (Von Ihering, 1890, pp. 153, 

 157; 1893, p. 115; 1910, p. 138). 



No exact localities are known. A. bahiensis, which is given from Bahia, is 

 not from that region, but, according to Von Ihering (1910) from the upper Amazon 

 and Ecuador. Von Ihering (1890, p. 152) thinks, on the other hand, that scripta 

 is identical with exotica. 



New Locality. — Rio Ribeira, Iguape, Sao Paulo, Brazil (Haseman collection, 

 collected by Richardo Krone). Two odd valves, right and left. 



My specimens agree well with Sowerby's (PI. 4, fig. 9) in shape and size. One 

 of them has the characteristic zig-zag black markings on the inside, while in the 

 other one these are found only near the posterior adductor-scar. However, the 

 color of the epidermis in both is not brownish, but green, darker upon the posterior 

 slope. Verj^ obscure green rays are seen on some parts of the disk. Since Simjison 

 says that the color of the epidermis varies to the "ordinary" (green) color, I do 

 not think that this prevents the union of our specimens with scripta. My left 

 valve has anteriorly two short scalariform stripes, barely visible; in the right valve 

 such are entirely absent. 



Measurements. 



Length. 



Height. 



Diameter. 



Beaks. 



Left . 

 Risht. 



154 mm. I 93 mm. = 60 pr. ct. of L. 

 160 " 196 " =60 



50 mm. 



48 " 



= 32 pr. 

 = 30 



ct. of L. 



at 61 mm. = 40 pr. ct. of L. 

 60 " =38 



