1430 ANODONTITES 



\'ar. anserinus (Spix). 



Shell elong;ated, considerably narrowed in front, full and 

 often subangulate behind the middle of the base. 

 Anodon anserinus Spix, Test. Fluv. Bras., 1827, p. 29, pi. 



XVII, figs. I, 2. — SowERBY, Conch. Icon., XVII, 1870, pi. 



XXXI, fig. 125. 

 Anodon anserina Catlow and Reeve, Conch. Nom., 1845, P- 



66. 

 Margarita (Anodonta) anserina Lea, Syn., 1838, p. 31. 

 Anodonta anserina Chenu, Man., 1859, II, p. 146. — Clessin, 



Conch. Cab. Ano.. 1873, p. 80, pi. xx, fig. i. 

 Margaron (Anodonta) anserina Lea, Svn., 1852, p. 52; 1870, 



p. 83. 

 Glabaris trapemalis var. anserinus Simpson, Syn., 1900, p. 924. 



This form, which is quite common, varies imperceptibly 

 into the type. 



Var. exoticus (Lamarck). 



Shell much elongated, narrowed in front; base often in- 

 curved in front of the middle, full behind the middle; hinge 

 line somewhat sinuous. 

 Anodonta exoticus Lamarck, An. sans Vert., VI, 1819, p. 87. 



— Dei.essert, Rec. Coq., Lam., 1841, pi. xiii, fig. i. — Chenu, 



111. Conch., 1858, pi. HI, fig. 2. — Clessin, Conch. Cab. Ano., 



1875- P- 178, pi- i.viii, figs. I, 2. 

 Anodon exotica Cati.ow and Reeve, Conch. Nom., 1845, P- 66. 

 Coluniba exotica P.^tel, Conch. Sam., Ill, 1890, p. 188. 

 Glabaris trapesialis var. exoticus Simpson, Syn., 1900. p. 924. 



The hinge line is arched in the posterior half and sags in 

 the middle of the front half. 



Var. scripttis (Sowerby). 



Shell elongated, generally irregularly obovate ; base full be- 

 hind the middle, often a little incurved in front of the middle ; 

 epidermis chestnut; nacre with a number of dark V-shaped 

 and zigzag markings. 



Length 162, height 88 mm. 



