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University of the State of New York 



MEMOIR 



ON THE 



Palaeozoic Reticulate Sponges 



CONSTITUTING THE FAMILY 



DICTYOSPONGIDAE 



BY 



JAMES HALL 



STATE GEOLOGIST AND PALAEONTOLOGIST 



IN COLLABORATION WITH 



JOHN M. CLARKE 



ASSISTANT STATE GEOLOGIST AND PALAEONTOLOGIST 



WYNKOOP HALLENBECK CRAWFORD CO. 



STATE PRINTERS 



NEW YORK AND ALBANY 



