ANODON.—P ate XXXIV. 
Species 140. (Mus. Smithson. Inst.) equilateral, yellowish green, obsoletely rayed, 
bluish white and very iridescent within; anterior 
side produced, rounded, slightly flattened in the 
middle, umbees flattened, retuse, minutely irregu- 
larly undulated; posterior side rather longer, with 
Axopon Henryana. An. testd ovato-oblongd, tenwis- 
simd, levigatd, inflata (versus wmbones precipue), 
subequilaterali, luteo-viridi, obsolete radiata, ints 
ceruleo-alba, valdé iridescenti ; latere antico pro- | 
ducto, rotundo; medio subplanulato, wmbonibus pla- 
nulatis, retusis, minute wrregulariter undulatis ; 
a radiating ridge and furrow, acuminated below 
at the end. 
latere postico longiusculo, radiatim unilirato et Lea. Obs. on Unio, vol. viii. p. 55, pl. 66, fig. 198. 
sulcato, infra ad terminum acummato. 
Henry’s Anopon. Shell ovate-oblong, very thin, 
smooth, inflated (most towards the umboes), sub- Peculiarly ovate, but a little pointed posteriorly. 
Hab. Matamoras and Tamanlipas, Mexico. 


