NOU OaN 
Prats VI. 
es ' Aan ea : a Pee ae oes 
Species 12. (Mus. Cuming in Brit.) tenut, concentricé rugatd, olivaced, radiutim et concen- 
ANopon BLAINVILLEANA. dn. lest ovali, levissind, tricé viridi fasciatd, intis pallide fulvd ; latere an- 
ampld, pallidé olivaced, leviter radiata, concentricé | tico brevi, margine dorsali brevi, recto, acuminato, 
strigatd, postice viridi radiatim fasciatd, intis tenviter | margine terminali subrotundo, margine ventrali sinu- 
margaritaced, albido-subceruled, paillii impressione | ato, compresso ; latere postico expanso, obscure bian- 
postice sinuatd ; latere antico brevi, margine dorsali | gulato, margine ventrali convexo, versus angulum ter- 
recto, angulato, margine terminali rotundo, infra | minalem sursum acclivi, ared dorsali trigond, obliqua, 
hianti, medio umbonibus inflatis, griseis, margine ven- 
trali convero ; latere postico oblongo, obscure biangu- | THE GIBBOUS ANODON. 
thin, concentrically wrinkled, olive, radiately and 
lato, supra angulum oblique alato. 
BLAINVILLE’s ANoDON. Shell oval, very smooth, full, | concentrically banded with green, pale-fawn within ; 
anterior side short, dorsal margin short, straight, 
pale-olive, lightly rayed, concentrically striped, pos- 
teriorly banded with green rays, thinly margarita- | acuminated, terminal margin rather rounded, ventral 
ceous, bluish-white within, pallial impression, sinu- 
ated posteriorly; anterior side short, with dorsal 
margin straight, angular, terminal margin round, 
gaping below, middle with the umboes inflated, grey, 
margine rectiusculo, umbonibus inflatis. 
Shell wide, rather round, full, 

margin sinuated, compressed ; posterior side expand- 
ed, obscurely biangular, ventral margin convex, slop- 
| ing upwards towards the terminal angle, dorsal angle 
trigonal, oblique, margin rather straight, umboes in- 
ventral margin convex; posterior side oblong, ob- | flated. 
scurely biangular, obliquely winged above the angle. | Benson. 
Lua, Obs. Unio, 1. p. 189. pl. 12. f. 34. | Hab. River Kiang. 
Hab. Brazil and Chili. Similar in form to Anodon suborbicularis, but differing 
| from that species in several important particulars, among 
which may be mentioned the rotundity of the umboes and 
the anterior sinus of the ontline. 
This shell is the type of the genus Leila. 

Species 13. (Mus. Cuming in Brit.) 
ANopon GiIBBA. An. testd lala, subrotundd, amplé, 
April, 1867. 
