A memoir on the Palaeozoic reticulate sponges, constituting the family Dictyospongidae - Hall, James, 1811-1898.; Clarke, John Mason, 1857-1925 (New York and Albany, Wynkoop Hallenbeck Crawford Co., 1898)
On cover: University, state of New York. State museum. Memoir II.
At head of title: University of the State of New York.
Bibliography: p. 41-51.
Keywords: Sponges, Fossil; Paleontology -- Paleozoic