Transactions - American Philosophical Society . [nio pcddem. SraifK,:n^i by JJtmyt^i OF THE FAMILY OF NAIADES. 437 posterior slope, and from the ventricosus in not being globoseover the umbones; and of course is much less in quite large impression of the mantle under the callus,between the lateral and cardinal teeth, is very remarkable inthese three species. 9. Unio Securis. Plate XL fig. 17. Testa subtrianguluri, inatquilaterali, per umbones valde complanata;valvulis crassis; nalibus elevatis, recurvatis, compressissimisque; dentecardinali magna, laterali crasso; ligamento bre
Transactions - American Philosophical Society . [nio pcddem. SraifK,:n^i by JJtmyt^i OF THE FAMILY OF NAIADES. 437 posterior slope, and from the ventricosus in not being globoseover the umbones; and of course is much less in quite large impression of the mantle under the callus,between the lateral and cardinal teeth, is very remarkable inthese three species. 9. Unio Securis. Plate XL fig. 17. Testa subtrianguluri, inatquilaterali, per umbones valde complanata;valvulis crassis; nalibus elevatis, recurvatis, compressissimisque; dentecardinali magna, laterali crasso; ligamento breviusculo, crassoque;margarita alba et iridescente. Shell sub-triangular, inequilateral, flattened over the umbones; valvesthick ; beaks elevated, recurved, much compressed ; cardinal tooth large ;lateral tooth thick; ligament rather short and tiiick; nacre pearly whiteand iridescent. Hab. Ohio. T. G. Lea. My of T. G. of Prof. of the Academy of Natural depressa of -9, Le
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