Transactions - American Philosophical Society . short and thick ; epidermis yellow inground, but traversed by oblique green rays, which give itsometimes a dark hue; these rays pass from the beaks to themargin over the whole disk, and are formed by zig-zag lines,which in some specimens are joined so closely as to becomeconfluent; on the posterior slope are irregular lines convergingbelow the ligament; cardinal teeth large, deeply divided inthe left valve; lateral teeth slightly curved; anterior cica-trices distinct, as are also the posterior, the smaller of whichis placed against the side of th
Transactions - American Philosophical Society . short and thick ; epidermis yellow inground, but traversed by oblique green rays, which give itsometimes a dark hue; these rays pass from the beaks to themargin over the whole disk, and are formed by zig-zag lines,which in some specimens are joined so closely as to becomeconfluent; on the posterior slope are irregular lines convergingbelow the ligament; cardinal teeth large, deeply divided inthe left valve; lateral teeth slightly curved; anterior cica-trices distinct, as are also the posterior, the smaller of whichis placed against the side of the lateral tooth at its termina-tion ; dorsal cicatrices situated along the base of the cardinaltooth within the cavity of the beaks; cavity of the beaksshallow; nacre pearly white and iridescent. Remarks.—This beautiful little shell is about the size ofBarness parvus. It is however entirely distinct from it. Itis much heavier, more ovate, and radiated; has no concentricundulations at the beaks like the parous, which character Mr TL Xll voli. Sympliriwca compr/ssa i/llUI Zllf-Ztlff. Cnia palulzi-- Drami/Lln^^ />/ J-Dra OP THE FAMILY OF NAIADES, 441 Barnes does not mention, and is yellowish, not and the donaciformis are all I know which possess thezig-zag markings, and they most resemble each other. 12. Unio Patulus. Plate XII. fig. 20. Testa ovatd, compressd, cuneiformi, inaquilaterali, obliqud, trans-versa; umbonibus comprcssis; valvulis sub-crassis; natibus sub-termi-nalibus; dente cardinaliparvo; laterali longo et sub-curvato; margaritdalbd. Shell ovate, compressed, wedge-shaped, inequilateral, oblique, trans-verse, compressed on theumbones; valves rather thick; beaks nearlyterminal ; cardinal tooth small; lateral tooth long and slightly curved ;nacre pearly white. Hab. Ohio. T. G. Lea. My Cabinet. Cabinet of T. G. Lea. Cabinet of Prof. Vanuxem. Diam. -8, Length 1-4, Breadth 2-3 inches. Shell compressed, wedge-shaped, ovate, broad and flat; snb-stance of th
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