620 



MEMOIRS OF THE CARNEGIE MUSEUM. 



Anatomy. — The soft parts of the male and female at hand are not in good con- 

 dition, the female being the better of the two. The usual structure of the genus, 

 however, could be made out, and no special features require mention. 



59. Anodontites iheringi (Clessin) (1882). 

 Shells: Plate XLII, fig. 8; Plate XLIII, fig. 1; Plate XLIV, fig. 1. 

 Anodonla iheringi Clessin, JNIalakazool. Blaett., V, 1882, p. 191, PL 4, fig. 5. 

 Glabaris iheringi Simpson, 1900, p. 919, 

 Anodontites sirionos iheringi Simpson, 1914, p. 1408. 



Type-locality. — Taguara del Mundo Novo, Ptio Grande do Sul, Brazil (system 

 of Rio Guahyba, N. E. of Porto Alcgre). 



New Localities. — Rio Jacuhy, Cachoeira, Rio Grande do Sul, Brazil (J. D. 

 Haseman coll., January 26, 1909). One young specimen, with soft parts, sex not 

 determined. Rio Vaccahy-Mirim, Santa Maria, Rio Grande do Sul, Brazil (J. 

 D. Haseman coll., January 29, 1909). Three specimens, with soft parts, two males 

 and a female. 



Distribution. — Guahyba-drainage in Rio Grande do Sul. 



This species very closely resembles A. patagonica, but is more elongated and 

 oblique, so that in outline it is still more like A. puelchana. To the latter species 

 it is related also in the more compressed shell. 



The shell is rather thin, of medium size. The outline is obliquely ovate, 

 narrower anteriorly, broader (higher) postei'iorly. The lower margin ascends in 

 its anterior portion, and may be gently curved or nearly straight. Valves gently 

 convex, rather compressed. The prismatic border is not so wide as in patagonica 

 and puelchana, but it is of the same general character, being wider along the an- 

 terior lower margin. It is of a grayish green color. The nacre is silvery white, 

 highly iridescent, often greenish or grayish discolored. Ligamental sinus about 

 as deep as wide, its anterior margin vertical, with the point bending forward. 



The chief difference from patagonica, and especially from puelchana, is in 

 the texture and color of the epidermis. The latter is brownish or brownish olive, 

 not very shining, covered with close, subconcentric striie, sublamellar near the 

 margins. Scalariform stripes are distinct upon the anterior half of the shell, 



