ANODON. 
PLATE 
Species 126. (Mus. Moricand. ) 
Anopon Moricanpr. An. testd laevigata, obliqué sub- 
quadratd, tenuissimd, subpellucidd, subinflata, medio 
subplanulata ; latere antico brevissimo, angusto, mar- 
gine dorsali recto, wmbonibus inflatis, margine ventrali 
sinuato ; latere postico elongato, margine dorsali ele- 
vato, cuneato, margine ventrali convexo; epidermide 
luteo-olivd, politd, obsoleté radiata ; nacro ceeruleo- 
alba, vivide iridescent. 
Moricanp’s Anopon. Shell smooth, obliquely subqua- 
drate, very thin, rather pellucid, a little inflated, 
rather flat in the middle; anterior side very 
short, narrow, dorsal margin straight; umboes 
inflated, ventral margin sinuated; posterior side 
elongated, dorsal margin elevated, cuneated, ven- 
tral margin convex; epidermis yellowish olive, 
polished, obsoletely rayed; nacre blue-white, very 
iridescent. 
Lea. Obs., vol. x. p. 33, pl. 49, f. 303. 
Hab. Bahia, Brazil. 
Flatter, thinner, and more obliquely elongated than 
some other South American species of similar form. 

Species 127. (Mus. Brit.) 
Anopon AnGasi. An. testa subtrigono-elongatd, sub- 
complanatd, solidd, valdé ineequilateral’, intus cupred, 
salmoneo, aureoque variegata ; epidermide  crasso, 
fusco ; latere antico brevissimo, angusto, margine dor- 
sali depresso, excavato ; wmbonibus acutis, albis, sub- 
complanatis ; latere postico expanso, biangulato, supra 
angulum complanato, margine dorsal elevato. 
Anaas’s Anopon. Shell subtrigonal-elongated, rather 
flat, solid, very inequilateral, varied within with 
copper, salmon, and gold; epidermis thick, brown, 
anterior side very short, narrow, dorsal margin 
depressed, excavated ; umboes acute, white, rather 
flat; posterior side expanded, biangular, flattened 
above the angle, dorsal margin elevated. 
Lea. Obs. on Unio, vol. xii. 
Hab, South Australia. 
The epidermis is solid, and of a rich mahogany 
brown. 

(Mus. Brit.) 
An. testd subtrapezxoidali, oblonga, 
rectiusculd, crassd, valdé inflata, levigatd, fusco- 
aurantia, fascits viridibus saturatioribus latis radiata, 
Species 128. 
ANoDON Pavonta. 

XXXII. 
intus albidd ; latere antico angusto, brevi, subacumi- 
nato, margine dorsali dechivi ; umbonibus subpromi- 
nentibus, ovatis, levibus; latere postico oblongo, 
posticé obtuse biangulato, margine dorsali recto, ter- 
minal subtruncato. 
Tue Peacock Anopon. Shell subtrapezoidal, oblong, 
rather straight, thick, much inflated, smooth, 
orange-brown, rayed with broad bands of rather 
deep green, whitish within; anterior side narrow ; 
short, subacuminated, with dorsal margin sloped; 
umboes rather prominent, ovate, smooth ; posterior 
side oblong, posteriorly obtusely biangulated, 
dorsal margin straight, terminal subtruncated. 
Lea. Obs. on Unio, vol ii. p. 78, pl. 21, f. 65. 
Hab. Little Beaver, Ohio. 
A very characteristic and easily recognisable species. 

Species 129. (Mus. Brit.) 
ANODON CORPULENTA. An. testd inflata, magnd, obliqué 
subovatd, vivide fusco, fulvo, viridique fasciatd et 
radiatd, tenut levigatd, intis vivide tridescenti ; 
latere antico angusto, subproducto, margine ventral 
subcontracto, dorsali recto ; umbonibus laevibus, valde 
inflatis, latere postico oblique producto, margine dor- 
sali brevi, recto, laterali obliquo, terminali subacume- 
nato, ventral’ convexo. 
Tue corpuLent Anopon. Shell inflated, large, oblique, 
subovate, brightly banded and rayed with green, 
brown, and fawn, thin, smooth, vividly iridescent 
within; anterior side narrow, rather produced, 
with ventral margin slightly contracted, dorsal 
straight; umboes smooth, much inflated; pos- 
terior side obliquely produced, dorsal margin 
straight, lateral oblique, terminal somewhat acu- 
minated, ventral convex. 
Coorer. In Say’s Description of Shells. 
Anodonta grandis (as of Say). Jay, &e. 
Hab. Missouri. 
There are two distinct forms attributed by some 
naturalists to An. grandis of Say,—namely, the one 
figured in our first plate of a trigonal form, very large 
from umbo to ventral margin, and our present species, 
| whose name is supposed to be synonymous with the 
former. I think, however, that the two forms are 
quite distinct, the latter being remarkable for having 
its greatest width on the anterior side, and for the 
great inflation of the umbonal region, which is likely 
to have suggested the name. 
June, 1870. 
