AGNTOPDEOUN:, 
Piate VIII. 
Species 16. (Fig. 15, Mus. Cuming in Brit.) 
ANODON sINUOsUs. dx. testd ovali, medio depressd, 
tenui, inflata, levigatd, pallidé olivaced, posticé viridi | 
radiata, intus albidd, umbonibus inflatis, cerulescenti- 
bus, margine ventrali medio sinuato ; latere antico 
brevi, supra margine recto, cuneato, margine ventrali 
hianti ; latere postico obliqué tumido, obscuré biangu- 
lato, margine ventrali post sinum convexo, ared post- 
angularit angustd, depressd, margine dorsali subcon- 
cavo, elevato. 
THe stNuous ANopon. Shell oval, depressed in the 
middle, thin, smooth, inflated, pale olive, posteriorly 
rayed with green, white within, umboes inflated, 
bluish, ventral margin sinuated in the middle; an- 
terior side short, straight above the margin, angular, 
ventral margin gaping; posterior side obliquely tu- 
mid, obscurely biangular, with ventral margin con- 
vex behind the sinus, postangular area narrow, de- 
pressed, dorsal margin rather concave, elevated. 
Lamarck, Anim. sans vert. Anodon, sp. 14. 
Hab. Brazil. 
Species 17. (Fig. 16, Mus. Cuming in Brit.) 
ANODON CREPERUS. Ax. testa 
planatd, solidd, nigrescenti, 
subtrapezoided, subcom- 
epidermide concentrice 
striato, intus obscure purpured ; latere antico brevi, 
subquadrato, subangustato, teste medio et umbonibus 
depressis ; latere postico producto, lato, obscure bian- 
gulato, area postangulari compressa, margine dorsali 
elevato. 
THe pArK Anopon. Shell subtrapezoidal, rather flat, 
solid, blackish, the epidermis concentrically striated, 
obscurely purple within; anterior side short, rather 
square, with a slight angle, middle of shell and 
umboes depressed; posterior side produced, wide, 
obscurely biangular, postangular area compressed, 
dorsal margin elevated. 
Lea (Unio), Obs. on Unio, ii. p. 33. pl. ix. f. 28. 
Hab. River Tennessee. 
This rather compressed, dark shell has the appearance 
rather of a Unio, but has no teeth, and only a very thin 
horizontal lamina on the hinge. 
April, 

Species 18. (Fig. 17, Mus. Cuming in Brit.) 
ANODON PaLLEGOIXi. 
compressd, angustd, concentrice rugatd, pallidé stra- 
An. testa subdonaciformi, oblonga. 
mined, ante angulum posticum divaricatim plicata, 
intis pallide salmoned ; latere antico brevi, angusto, 
margine dorsali recto, margine ventrali sursum acclivi, 
medio contracto ; latere postico lato, elevatim angu- 
lato, post angulum depresso, termino oblique truncato, 
margine dorsali elongato, elevato, recto, umbonibus 
parcis. 
PALLEGOIX’s ANODON. 
long, compressed, narrow, concentrically wrinkled, 
pale straw, divergently plaited in front of the posterior 
angle, pale salmon-coloured within; anterior side short, 
Shell rather wedge-shaped, ob- 
narrow, dorsal margin straight, ventral margin slop- 
ing upwards, contracted in the middle ; posterior side 
broad, with a raised angle, depressed behind the 
angle, obliquely truncated at the end, dorsal margin 
elongated, elevated, straight, umboes small. 
CuminG, MS. in Cabinet. 
Hal. Siam. 
Of an oblong form, rather narrowed at the posterior 
end, and of a pale straw-colour; this shell is also cha- 
racterized by a set of diverging wrinkles in front of the 
oblique angle. 
Species 19. (Fig. 18, Mus. Cuming in Brit.) 
ANODON GIGANTEA. 
levigatd, concentricé leviter undulata, fusco-olivaced, 
An. testdé subovatd, magna, inflata, 
concentricé strigatd, postice et versus marginem ven- 
tralem nigrescenti, intis albidd, margaritaced ; latere 
antico angusto, brevi, margine dorsali subconcavo, ter- 
mino cuneato, margine ventrali surstim gradatim ac- 
clivi, umbonibus valde gibbosis ; latere postico imagno, 
inflato, superné angulis duobus obscuris radiato, ter- 
mine vix acuminato, ared postangulari expansd, sub- 
alata, margine dorsali elevato, margine luterali ob- 
ligquo. 
THE GIGANTIC ANODON. 
smooth, concentrically lightly undulated, brown- 
olive, concentrically striped, becoming blackish at 
the back and towards the ventral margin, white. 
pearly within; anterior side narrow, short, with 
Shell subovate, large, inflated, 
dorsal margin slightly concave, termination cornered, 
