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>I.—A Memoir on the Palæozoic Retigulate Sponges constituting the Family Dictyospongidæ. By James Hall, State Geologist and Palæontologist, in collaboration with John M. Clarke, Assistant State Geologist and Palæontologist. Imp. 4to; pp. 350, plates lxx and 45 figures in the text. (University of the State of New York, 1898.)
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I.—A Memoir on the Palæozoic Retigulate Sponges constituting the Family Dictyospongidæ. By James Hall, State Geologist and Palæontologist, in collaboration with John M. Clarke, Assistant State Geologist and Palæontologist. Imp. 4to; pp. 350, plates lxx and 45 figures in the text. (University of the State of New York, 1898.)
