ANODON.—P.ate XXXVI. 
fused, ints alba ; latere antico brevi, angusto, sub- 
frigono, margine. dorsali declivi, ventrali sursum 
acclivi ; umbonibus retusis, planis, margine ventrali 
medio angulato, convexo; latere postico lato, sub- 
alato, margine dorsali subelevato, laterali 
obliquo, terminali oblique truncato, acuminato, ven- 
recto, 
trali sursuim acclivt. 
Woop’s Anopon. Shell irregularly ovate, subacumi- 
nated at both ends, smooth, rather thick, olive- 
brown, white within; anterior side short, narrow, 
subtrigonal, dorsal margin sloped downward, 
ventral sloped upward; umboes retuse, flat, ven- 
tral margin angular in the middle, convex; pos- 
terior side wide, rather alated, dorsal margin 
straight, somewhat elevated, lateral, oblique, termi- 
nal obliquely truncated, 
sloped upwards. 
Lea. Obs. on Unio, vol. i. pl. 2, f. 5, f. 13. 
Hab. China. 
acuminated, ventral 
A peculiar bend in the ventral margin gives a 
pentagonal figure to this species. 

Species 150. (Mus. Lea.) Copied. 
Awnopon Pepinranus. An. testd@ subrhomboided, tenui, 
levigatd, stramined, concinné lineatim fasciatd, intus 
subceruled ; latere antico parvo, margine dorsali 
excavato, declivi; umbonibus prominulis, margine 
ventrali recto ; latere postico prope umbones uniangu- 
lato, prope margines biangulato, margine dorsali recto, 
cuneato, terminali truncato. 


Tue Pepry Anopon. Shell subrhomboidal, thin, smooth, 
straw coloured, neatly linearly banded, bluish 
within ; anterior side small, dorsal margin exca- 
vated, sloped; umboes rather prominent, ventral 
margin straight; posterior side near the umboes 
with one angle, near the margin with two angles; 
dorsal margin straight, cuneated, terminal trun- 
cated. 
Lea. Obs. on Unio, vol. ii. p. 96, pl. 16, f. 51. 
Hab. Lake Pepin, County Ohio. 
This species is apparently more triangular in its early 
stages than in its later growth. 
Species 151. (Mus, Cuming in Brit.) 
Ayopon Danomeyensis. An. testd oblongd, angustd, 
subreniformi compressa, valdé inceequilaterali, tene- 
broso-olivaced, striata, intus alba ; latere antico brevi, 
margine dorsali depresso ; umbonibus acutis, promi- 
nulis, margine ventrali concavo, sinuato ; latere 
postico producto, margine dorsali subconvexo, laterali 
perobliquo, terminali rotundo, subacuminato. 
Tae Danomey Anopon. Shell oblong, narrow, subre- 
niform, compressed, very inequilateral, dark olive, 
striated, white within; anterior side short, dorsal 
margin depressed; umboes sharp, rather promi- 
nent, ventral margin concave, sinuated, posterior 
side produced, dorsal margin rather convex, 
lateral very oblique, terminal rounded, subacu- 
minated. 
Lea. Obs. on Unio, vol. vii. p. 79, pl. 41, fig. 141. 
Hab. Dahomey, West Africa. 
