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<p>Book digitized by Google and uploaded to the Internet Archive by user tpb.
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<br>Subjects: anterior; beaks; ventral; edge; rounded; posterior; margin; anteriorly; valve; teeth; ventral edge; cardinal teeth; dorsal edge; anterior slope; anterior side; upper valve; lower valve; posterior side; lateral teeth; ventral margin</div>
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William Wood ,  Sylvanus Charles Thorp Hanley</div>
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