ACNE OD CONN: 
XXXVI. 
PLATE 
Species 145. (Mus. Jay.) 
Avxovon Montezianus. An. testd parvé, ovali, levigata, 
solida, subcompressd, stramined, concentricé fusco- 
lineata, obscuré radiatd, intus ceeruled iridescenti ; 
latere antico brevi, rotundo, margine dorsali subexca- 
vato, latere postico majort, ad terminum subacu- 
minato. 
Monteztan Anopon. Shell small, oval, smooth, 
solid, subcompressed, straw coloured, with concen- 
tric brown lines, obscurely rayed, iridescent blue 
within ; anterior side short, round, dorsal margin 
a little excavated; posterior side larger, subacu- 
minated at the end. 
Lea. Obs. on Unio, vol. vi. p. 78, pl. 23, fig. 55. ~ 
Hab, Central America. 
THE 
There isa sort of oval obtuseness about this little 
shell that would be sufficient to prevent its being mis- 
taken for other species. 

Species 146. (Mus. Newcombe.) 
Anopon Trxasensis. An. testd tenuissimd, inequilaterali, 
ovata, pallideé luted, intt&s ceeruleo-alba valde iride- 
scentt ; latere antico subangustato, margine dorsali 

recto, depresso ; medio subdepresso, umbonibus undu- | 
lato-tuberculatis ; latere postico oblique producto, 
acuminato, margine dorsali recto, subelevato ; margine 
ventrali convexo. 
Texas ANODON. 
ovate, pale yellowish, very iridescent bluish white 
within, anterior side rather narrow, dorsal margin 
THE Shell very thin, inequilateral, 
straight, depressed ; middle subdepressed, umboes 
with wavy tubercles; posterior side obliquely 
produced, acuminated, dorsal margin straight, 
slightly elevated; ventral margin convex. 
Lea. Obs. on Unio, vol. viii. p. 48, pl. 65, f. 91. 
Hab. Texas. 
This species has a thickening layer in the hinge 
which is almost tooth-like, although it is a very thin 
shell. It is one of those instances in which the line 
of demarcation between the genera Unio and Anodon is 
very indistinct. 

Species 147. (Mus. New York Lyceum.) 
Awopon Hatrtonis. 
valdé inequilaterali, striata, crassa, partim subundu- 
An. testa oblongata, ovata, levi, 
lata, tenebroso-olivaced, intus ceruled ; latere antico 
brevissimo, subacuminato ; umbonibus prominulis, 
margine ventrali equaliter convexo ; latere postico 
oblique producto, via angulato, obscuré viridi ra- 
diato. 
Hatton’s Anopon. Shell oblong, ovate, smooth, very 
inequilateral, striated, thick, partially subundu- 
lated, dark 
‘very short, rather acuminated; umboes rather 
olive, bluish within; anterior side 
prominent, ventral margin equally convex; pos- 
terior side obliquely produced, scarcely angulated, 
obscurely rayed with green. 
Lea. Obs. on Unio, vol. vi. p. 36, pl. 32, f. 31. 
Hab. Near Cartago, New Granada. 
First collected by Mr. Halton in a perfectly isolated 
pond of one acre in extent, about five miles distant 
from the nearest river. 

Species 148. (Mus. Lea.) Copied. 
Awnopon Danretsu. An. testd subquadrato-ellipticd, 
compressa, tenui, levigatd, tenebroso-fuscd, nitenti, 
obsolete radiata ; ints subceruled ; latere antico 
brevissimo, subangustato, rotundo ; umbonibus promi- 
nulis ad apices undulatis ; margine ventral rectius- 
culo; latere postico oblongo latiusculo, biangulato, 
margine dorsali recto, ad terminum truncato. 
Daniets’ Anopon. Shell subquadrate-elliptic, com- 
pressed, thin, smooth, dark brown, shining, obso- 
letely rayed, bluish within; anterior side very 
short, slightly narrowed, round; umboes rather 
prominent, undulated at the apices ; ventral mar- 
gin rather straight, posterior side oblong, rather 
wide, biangular, dorsal margin straight, truncated 
at the end. 
Lea. Obs. on Unio, vol. viii. p. 47, pl. 68, f. 190. 
Hab. Topeka, Kansas. 

Species 149. (Mus. Acad. Nat. Se. Phil.) 
Anopon Woopranus. An. testd irregulariter ovata, 
utrinque subacuminatd, levi, crassiisculd, olivaceo- 
June, 1870. 
