ANODON.—Ptate XXIII. 
Species 91. (Mus. Castelnaud.) 
Ayopon soLipuLa. ~ An. testd cylindraced, solid, fuscd, 
levigatd, valde inequilaterali ; intis alba wi- 
descenti; latere postico producto, rectiusculo ; 
margine dorsali recto ; margine laterali declivi, 
termino obtuso ; margine ventrali recto ; latere 
antico brevissimo, obtuso, pleno. 
THe sotip Anopon. Shell cylindrical, solid, brown, 
smooth, very inequilateral; within iridescent 

white ; posterior ‘side produced, rather straight ; 
dorsal margin straight, lateral margin sloped, 
obtuse at the end; ventral margin straight; 
anterior side very short, obtuse, full. 
Hours. Castelnaud’s Expedition, p. 88. 
Hab. River Amazon. 
Not very widely differing from A. elongata, 
Swain’s. 
