<i>The Schrammen Collection of Cretaceous Silicispongiæ in the American Museum of Natural History</i> . By Marjorie O'Connell, Ph.D. <i>Bulletin of the American Museum of Natural History</i> , Vol. XLI., Art. I., pp. 1-261, Plates I-XIV., Map and five text figures. Aug. 1, 1919.
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