ANODON,—Puate XXVIII. 
Tue Carirorntan Anopon, Shell small, wide, com- 
pressed, rather trigonal, thin, green-olive; ante- 
rior sidenarrow,short; middle radiately expanded, 
umboes with undulated plaits ; posterior side wide, 
obscurely biangular, dorsal margin winged, cuneate, 
elevated. 
Lea. Obs. on Unio, vol. iv. pl. 25, f. 47, 
Hab. Rio Colorado, California. 
It is difficult to distinguish these small thin shells 
from the young of larger species of symphynote Unios, 
but I believe the present to be strictly a species of | 
Anodon, 
Species 114. (Mus. Walton.) 
Awopon Warpranus, An. testd oblongo-subquadratd, 
concentricé subrugata, fusco-fumigatd, inflata, in- 
tis prope umbones salmoned, prope margines sub- 
ceruled ; latere antico subproducto ; medio tumido, 
subplanato, wumbonibus tuberculatis ; latere postico 
oblongo, margine dorsali recto, margine laterali 
convexo, termino truncato, margine ventrali rec- 
titsculo. 
Warp’s Anopon. Shell oblong, subquadrate, concen- 
trically rather wrinkled, smoky brown, inflated, 
salmon within near the umboes, bluish near the 
margins; anterior side rather produced; middle 
tumid, rather flattened, umboes tuberculated; 
posterior side oblong, dorsal margin straight; 
lateral margin convex, end truncated, ventral 
margin straight. 
Lea. Obs. on Unio, vol, ii. pl, 14, f. 42, 

| Hab. Ohio. 

