FRESH WATER AND LAND SHELLS. 21 
Unio Ktemianus. Pl, XVII. Fig. 18. 
Testa plicata, triangulari, compressa, ad latere planulata, inequilaterali, posticé obtusé angulata; valvulis 
subcrassis; natibus subprominentibus ; epidermide tenebroso-fuscd ; dentibus cardinalibus crassis crenulatis- 
que; lateralibus brevis rectisque; margaritd alba et iridescente. 
Shell plicate, triangular, compressed, flattened on the side, inequilateral, obtusely angular behind; valves rather 
thick; beaks somewhat prominent; epidermis dark-brown; cardinal teeth thick and crenulate; lateral teeth short 
and straight; nacre white and iridescent. 
Hab. Suwanee river, Florida, Major Le Conte. 
My cabinet and cabinet of Major Le Conte. 
Diam. .8, Length 1.2, Breadth 1.6 inches. 
Shell plicate, triangular, compressed, flattened at the side, inequilateral, obtusely an- 
gular behind, enlarged over the umbonial slope; substance of the shell rather thick, thinner 
behind ; beaks somewhat prominent; epidermis dark-brown, with marks of growth rather 
distant; ligament short and thick; folds irregular, small and extending nearly over the 
whole disk, on the posterior slope more regular and nearly parallel; posterior slope large, 
and raised into a carina, umbonial slope obtusely angular; cardinal teeth thick, large, 
crenulate and double in both valves; lateral teeth short and straight, separated from the 
cardinal tooth by a rather large plate; anterior cicatrices distinct; posterior cicatrices 
distinct; palleal cicatrix well impressed; cavity of the shell rather deep and rounded; 
cavity of the beak deep and acutely angular; nacre white and iridescent. 
Remarks.—A new plicate species is rather a rare acquisition, and I believe this is the 
first from Florida, Major Le Conte, I believe, procured but two specimens, both of which 
are before me. In outline and size it is allied to U. infucatus, Con., which, however, is 
not figured as a folded shell by him. It differs, however, in having larger folds, which 
are more interrupted, and in the colour of the epidermis, which, in infwcatus, when old, is 
almost, if not quite, black. The folds in Aleinianus are very irregular, and so much 
broken up as to have the appearance, on part of the disk, of being nodules. The beaks, 
unfortunately, of the two specimens are much eroded, and their characters, therefore, not 
known. I should suppose that, in perfect or young specimens, the folds would extend to 
the apex, and present a fine appearance. 
This interesting species I dedicate to Klein, the author of Testamen Methodi, 1773, who 
was in advance of most of the conchologists of his day. 
Unio satur. PI. XVII. Fig. 19. 
Testa levi, triangulari, valde inflata, inequilaterali, posticé truncata; valvulis crassis; natibus mazximis, 
inflatis, rotundatis; epidermide tenebroso-fuscd, polita; dentibus cardinalibus magnis, compressis, obliquis, 
acuminatis ; crenulatis; lateralibus longis, lamellatis subcurvisque; margarita alba et iridescente. 
Shell smooth, triangular, very much inflated, inequilateral, truncate behind; valves thick ; beaks large, inflated 
and rounded; epidermis dark-brown, polished; cardinal teeth large, compressed, oblique, acuminate, crenulate ; 
lateral teeth long, Jamellar and curved; nacre white and iridescent. 
Hab. Alexandria, Louisiana, J. Hale, M.D. Lake Calcashue, near New Orleans, 
Mr. Anthony. 
My cabinet and cabinets of Dr. Hale and Mr. Anthony. 
Diam. 2.1, Length 2.5, Breadth 3 inches. 
