68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
lack of marked anterior folding, and the sharp, somewhat elongated 
beak of the brachial valve. It differs from all Girty’s species, D. 
prolongatum, cordatum, sulcatum, and spatulatum, in lacking anterior 
folding and having only a faint trace of sulcation on the pedicle valve. 
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