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Plaesiomys platys - 8598 - OHosee Speer's Ferry. Very large ventral length 26mm., Width 33mm. Thickness 7mm. Sides subparallel front broadly rounded. Cardinal extremites a right [[angle symbol]] but deflected dorsally with deep grooves. Beak prominent. Dorsal beak extending slightly posterior to ventral. Ventral valve very slightly concave at front half. Ribs varying from 9 - 12 in 5mm. at front on same specimens In 5mm at 18mm anterior to beak are 12 costellae. This specimen is a large specimen of P. brevis. Same is probably true of the interior These may differ from the large coarse-ribbed ones from Rye Cove, I described. Plaesiomys brevis - 2 specimens Cotypes 8600 - Larger 17.5 long, 24 wide Cardinal extremities deflected. Ventral valve slightly concave in front Sulens shallow extending from beak to front margin. 13 costellae in 5mm at antero-lateral margin of dorsal valve. Swollen ribs not numerous. OHosee Fugates Hill.