ANODONTITES I42I 



Margaron (Jnodonta) puelchana Lea, Syn., 1852, p. 51 ; 1870, 



p. 81. 

 Glaharis puelchanus Simpson, Syn., 1900, p. 921. 

 Anodontites puelchanus Pii.sbry, Princeton Univ. Exp., Ill, 



1911, p. 109. 

 Anodonta obtusula Hupe, Moll. Nouv., Ill, 1857, P- 87, pi. 



XVII, fig. 3. — Clessin, Conch. Cab. Ano., 1875, P- 214, pi. 



LXVI, fig. 2. 

 Anodon obtusula Sowepby, Conch. Icon., XVII, 1868, pi. xx, 



fig. 8t. 

 Margaron (Anodonta) obtusula Lea, Syn., 1870, p. 79. 

 Glabaris obtusula von Iiiering, Arch, fur Nat., 1893, p. 119. 



Since writing the Synopsis I have seen a set of shells, which 

 shows considerable variation, and seems to stand partly be- 

 tween the A. limnoicus and A. puelchanus of d'Orbigny. The 

 figures of the two show but little real difiference, the latter being 

 a little more inflated in the ventral region and not so distinctly 

 banded as the former. 



Anodontites eucidus (d"()rbigny). 



Shell oblong, subrhomboid, subinflated, thin, with a yellow- 

 green epidermis, which is smooth and shining and is marked 

 more or less with broken rays on the anterior part and entire 

 ones on the posterior part ; beaks high, rather sharp ; dorsal 

 and basal lines curved, the latter more so ; anterior end round- 

 ed ; dorsal slope obliquely truncate; posterior ridge somewhat 

 double, ending in a feeble biangulation ; nacre blue with dark, 

 zigzag markings. 



Length 50, height 25, diam. 13 mm. 



Uruguay. 

 Anodonta lucida d'ORBiCNY, Guer. Mag.. 1835, p. 40; Voy. Am. 



Mer., 1843, P- 620, pi. Exxix, fig. 4-6. — Chenu, 111. Conch., 



1858, pi. Ill, figs. 6, 6a, 6b. — Clessin, Conch. Cab. Ano., 



1875, p. 208, pi. Exix, figs. 4, 5. 

 Margaron (Anodonta) lucida Lea, Syn.. 1852, p. 51 ; 1870, p. 



82"". 

 Glabaris lucidus Simpson, Syn., 1900, p. 921. 



