276 DESCRIPTION OF NEW 
whole disk give it a dark appearance, particularly on the posterior part. The beaks 
being eroded, I am unable to give their characters, but there is an appearance of obsolete 
undulations. 
Unio Buckteyi, Pu. 39. Fie. 2. 
Testd ellipticd, inflata, valde inaquilaterali, postice angulatd; valvulis crassis; natibus subprominentibus; epidermide tene- 
broso-fuscd; dentibus cardinalibus magnis crassisque; lateralibus longis curvisque; margarita purpured vel salmonis colore 
tinea. 
Shell elliptical, inflated, very inequilateral, angular behind ; valves thick ; beaks rather prominent; epidermis dark- 
brown; cardinal teeth large and thick, lateral teeth long and curved; nacre purple or salmon-coloured., 
Hab. Lake George and Lake Monroe, Florida. S. B. Buckley. 
My cabinet and cabinets of Dr. Budd and Mr, Buckley. 
Diam, 1.5, Length 2, Breadth 3.7 inches, 
Shell elliptical, inflated, very inequilateral, angular behind; substance of the shell 
thick; beaks rather prominent; ligament long and rather thick; epidermis dark-brown, 
smooth, and shining, with obscure green rays in the young; cardinal teeth large and 
thick, single in the right and double in the left valve; lateral teeth long, thick, and 
slightly curved; anterior cicatrices distinct; posterior cicatrices confluent; dorsal cica- 
trices placed above the centre of the cavity of the beaks; cavity of the shell rather deep; 
cavity of the beaks rather deep; nacre purple or salmon-coloured. 
Remarks.—A number of specimens of this species are before me, and they present 
many different forms, differing in many respects as the varieties of the U. complanatus 
do from each other. The prevailing colour of the nacre, which is very brilliant, is sal- 
mon, but many are purple—two only are white. The epidermis of all the older speci- 
mens is dark-brown—some nearly black, and without rays; the younger are smooth and 
polished on the outside, with numerous obscure green rays, darker on the posterior slope. 
The general outline, in most specimens, is like that of U. Batavus, (Lam.,) but some 
individuals approximate to that of U. ovals, (I’lem.) 
Unio minor, Pu. 39. Fie. 3. 
Testa ellipticd, subinflatd, valde inequilaterali, postice rotundatd; valwulis crassis; natibus subprominentibus; epidermide 
striatd, subnigrd; dentibus cardinalibus subgrandibus; lateralibus parvis curvisque; margarita albd et tridescente. 
Shell elliptical, rather inflated, very inequilateral, rounded behind; valves thick; beaks rather prominent; epider- 
mis striate, nearly black; cardinal teeth rather large; lateral teeth small and curved; nacre white and iridescent. 
Hab. Lake Monroe and Lake George, Florida. 8. B. Buckley. 
My cabinet and cabinets of Dr. Budd and Mr. Buckley. 
Diam. .4, Length .6, Breadth .9 of an inch. 
Shell elliptical, rather inflated, very inequilateral, rounded behind; umbonial slope 
rounded; substance of the shell thick, thinner behind; beaks rather prominent; ligament 
very short and thin; epidermis closely striate, nearly black; cardinal teeth rather large; 
lateral teeth small and curved; anterior cicatrices distinct; posterior cicatrices confluent; 
dorsal cicatrices placed above the centre of the cavity of the beaks; cavity of the shell 
deep; cavity of the beaks rather deep and angular; nacre pearly white and iridescent. 
