1442 ANODONTITES 



by vSpix, but it agrees well in otber characters. It may possi- 

 bly be entitled to specific rank. It may be given the varietal 

 name of pall esc ens. 



Anodontites amazonensis (Lea). 



Shell elongated, subinllated, solid, inequilateral, subrhom- 

 boid ; beaks moderately full and elevated, elongated ; posterior 

 ridge rounded, but having about three radial, thread-like ribs ; 

 hinge line lightly arched ; base straight or a little incurved me- 

 dially ; anterior end evenly rounded ; posterior end with a long, 

 oblique subtruncation above, somewhat biangulate below ; sur- 

 face strongly and irregularly, concentrically sculptured ; epi- 

 dermis very dark olive with shadings of green, lighter at the 

 beaks ; nacre brilliant purple-rose ; muscle scars impressed. 



Length 8i, height 37, diam. 25 mm. 



Amazon. 

 Anodonta ama.-^onensis Lea, Pr. Ac. N. Sci. Phila., IV, i860, p, 



89; Jl. Ac. N. Sci. Phila., V, 1863, p. 395, pi. xlvi. fig. 300; 



Obs., X, 1863, p. 31, pi. xi.vi, fig. 300. — Clessin, Conch. 



Cab. Ano., 1874, p. 119, pi. xxxvii, fig. 7. 

 Anodon amazonensis Sowerby, Conch. Icon., XVII, 1870, pi. 



XXX, fig. T20. 



Margaron (Anodonta) amazonensis Lea, Syn., 1870, p. 82. 

 Glaharis amazonensis Simpson, Syn., 1900, p. 928. 



Lea states that several specimens of Anodonta amazonensis 

 were submitted to him by Mr. Wheatley. There is only the 

 type, a slightly broken shell, in the Lea Collection. The group 

 to which it belongs is a very puzzling one, and although I have 

 had the opportunity to examine a good deal of material be- 

 longing to it, but little of it at all closely agrees with the fig- 

 ures or descriptions. There seems to be an almost complete 

 connection between amazonensis and mortonianus, though the 

 former is typically very much more elongated than the latter. 



Anodontites weddelut (Hupe). 



vShell rather solid, subinflated, somewhat elongated, elliptic- 

 rhomboid. ine(]ui!ateral ; beaks full and high ; dorsal and basal 

 lines curved ; anterior end a little narrowed, rounded : posterior 



