ANODONTITES 1409 



regular growth lines ; epidermis brownish-olive or brown-tinted 

 violet ; ligamental patch small, triangular ; muscle scars indis- 

 tinct ; nacre violet-tinted, rich and iridescent ; prismatic bor- 

 der wide, reddish-tinted. 



Length 60. height 43, diam. 26 mm. 



Length -y^,, height 38, diam. 26 mm. 



South America. 

 Anodonta pa::ii l,v.\, Pr. Ac. N. Sci. Phila., X. 1866. p. 35 ; 



Jl. Ac. N. vSci. Phila., VI, 1868, p. 274. pi. xxxvi, fig. 87; 



Obs., Xn, 1869, p. 30, pi. XXXVI. fig. 87. — Clessix, Conch. 



Cab. Anc. 1874, p. 139, pi. xiiii, figs. 3, 4. 

 Mar gar on (Anodonta) pazii Lka, Syn., 1870, p. 81. 

 Glabaris pacii Simpsox, Syn., 1900, p. 918. 



I have before mc the type, the epidermis of which has been 

 somewhat worn awa}'. and another smaller and more inflated 

 shell, which [ refer to this with a little doubt. Lea remarks 

 that the nacre is the most intensely red of any Anodonta with 

 which he is acquainted. Indeed the whole shell is tinged with 

 this reddish or violet-red color, which is one of its best dis- 

 tinguishing characters. 



An ODONTITES RURicuNDUs (Lea). 



vShell suborbicular, subinfiated. scarcely subsolid, slightly in- 

 equilateral : beaks considerably elevated, though not very full ; 

 dorsal line very lightly arched : dorsal slope widely and al- 

 most squarely truncate ; anterior end a little narrowed and 

 with the base rounded ; surface with irregular growth lines ; 

 epidermis dark olive, with two feeble, darker rays on the pos- 

 terior ridge ; muscle scars shallow ; ligamental patch small, tri- 

 angular ; nacre bluish, tinted reddish and violet at the border. 



Length 59, height 51, diam. 30 mm. 



Length yy, height 61. diam. 36 mm. 



Uruguay River, South America. 

 Anodonta ruhicunda Le\, Pr. Ac. X. Sci. Phila.. W . i860, p. 



92; Jl. .\c. X. Sci. Phila.. \'. 1863. p. 392. pi. xlvi, fig. 299; 



Obs.. X. 1S63. p. 28. pi. XLVI, fig. 299. — Clessin. Conch. 



Cab. .\no.. 1876, p. 106, pi. xxxii, figs. 5, 6. 



