Excerpt from A Monograph of the Order Pholadacea: And Other Papers
H. M o n o d o n, Rackett. This species appears to be rare at Harper's Ferry. I found but one individual.
H. H ir s u t a, Say. Common. All that were collected are entirely desti tute of the hairy epidermis. There is considerable difference in the convexity of the upper surface, the Spire being sometimes rather depressed.
H. C o no av a, Say. Dr. Binney, in his Terrestrial Mollusks, states that the upper.
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