. Transactions - American Philosophical Society. H- Cljea del. 52. C^ae^etytis: .f ..j on stone liy J-TFrench- .Sinciair8 LifcUPhil NEW FRESH WATER AND LANI) SHELLS. 239 Unio Rajahensis. Plate 23, Fig. 53. Teslu triangulari, inflatn, inaquilaterali, postici angulatd; valvulis crassis; natibus valdc -prominen-tibus; epidermide tenebroso-fascd; dentibus cardinalibus magnis; lateralibns sublongis curvisque;margarita alba el valdi iridexccnle. Shell triangular, inflate J, inequilateral, angular behind; substance of the shell thick; beaks very promi-nent; epidermis dark brown; cardinal teeth large;

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. Transactions - American Philosophical Society. H- Cljea del. 52. C^ae^etytis: .f ..j on stone liy J-TFrench- .Sinciair8 LifcUPhil NEW FRESH WATER AND LANI) SHELLS. 239 Unio Rajahensis. Plate 23, Fig. 53. Teslu triangulari, inflatn, inaquilaterali, postici angulatd; valvulis crassis; natibus valdc -prominen-tibus; epidermide tenebroso-fascd; dentibus cardinalibus magnis; lateralibns sublongis curvisque;margarita alba el valdi iridexccnle. Shell triangular, inflate J, inequilateral, angular behind; substance of the shell thick; beaks very promi-nent; epidermis dark brown; cardinal teeth large; lateral teeth rather long and curved; nacre white andvery iridescent. ? - ? Hab. The Rajahs Tank, Calcutta. Dr. Jay. My Cabinet, and Cabinets of Dr. Jay and Dr. B. W. Budd of N. .8, Length , Breadth inches. Shell triangular, inflated, inequilateral, angular behind; posterior slope muchflattened, cordate, with two curved impressed lines; umbonial slope carinate;beaks very prominent and solid; ligament short, thick and light b

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