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13th annual report 2d Geol abstract Acad Amer American Naturalist Angelo Heilprin Annelid appendages April number Arts Asaphus author beds containing Boston Soc Bull Calciferous Cambrian Canada Carboniferous formation Cephalopoda Chemung Cincinnati group Cincinnati Soc containing a fauna county Cretaceous rocks Crinoids Department of Geol descriptions excellent fossil Ostreidae genus Geological Magazine Hist howelli Hyatt illustrations Indiana Department insects J. B. MARCOU Journ Jurassic Leo Lesquereux lished Lower Carboniferous Magazine for February Mesozoic flora Mickleborough's Mollusca Museum Nat N. A. Invertebrate North American April NORTH AMERICAN INVERTEBRATE Notes number he describes occur Olenellus Ottawa Field Nat Palaeontology Palaeozoic paper Pennsylvania Philadelphia previously described species Primordial fossils Proc Progress of N. A. Progress of North published republishes review Rhaetic Rocky mountains Royal Soc Science Scudder Silurian species of fossil specimens Surv Tertiary three articles title Trans Triassic Trilo Trilobite U. S. Geological Survey Upper Devonian Walcott Worthen York