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7 17 Platyodon cancellatum Conrad Rock clam and Date clam 18 Schizothaerus Nuttali, Conrad Big Softshelled clam and Otter clam. 19 Siliqua spatula, Dixon. = Machaera patula Gaping Knife Clam 20 Macona nasuta, Conrad Thin clam - native softshell. 21 Cuneus staminea, Conrad. = Tapes staminea, etc, Auct. Little round clam