A crinoid fauna and a new species of Pycnocrinus from the Martinsburg Formation (Upper Ordovician), lower Hudson Valley, New York

Paleoecology of Echinoderm Assemblages from the Upper Ordovician (Katian) Dunleith Formation of Northern Iowa and Southern Minnesota

Paleoecology of Suspension-Feeding Echinoderm Assemblages from the Upper Ordovician (Katian, Shermanian) Walcott-Rust Quarry of New York

CAMERATE AND CLADID CRINOIDS FROM THE UPPER ORDOVICIAN (KATIAN, SHERMANIAN) WALCOTT-RUST QUARRY OF NEW YORK

Systematics and Paleoecology of Haptocrinus Buttsi , a New Species of Disparid Crinoid from the Upper Ordovician Hatter Limestone of Central Pennsylvania

SOME DISPARID CRINOIDS FROM THE UPPER ORDOVICIAN (SHERMANIAN) WALCOTT-RUST QUARRY OF NEW YORK

THE APPLICATION OF FILTRATION THEORY TO FOOD GATHERING IN ORDOVICIAN CRINOIDS

UPPER ORDOVICIAN CRINOIDS FROM THE PLATTEVILLE LIMESTONE OF NORTHEASTERN IOWA

ONTOGENY OF THE FOOD-GATHERING SYSTEM IN ORDOVICIAN CRINOIDS

THE PALEOBIOLOGY AND ONTOGENY OF CINCINNATICRINUS VARIBRACHIALUS FROM THE MIDDLE ORDOVICIAN (SHERMANIAN) WALCOTT-RUST QUARRY OF NEW YORK

QUINTUPLEXACRINUS , A NEW CLADID CRINOID GENUS FROM THE UPPER ORDOVICIAN MAQUOKETA FORMATION OF THE NORTHERN MIDCONTINENT OF THE UNITED STATES

CUPULOCRINUS ANGUSTATUS (), A CLADID CRINOID FROM THE UPPER ORDOVICIAN MAQUOKETA FORMATION OF THE NORTHERN MIDCONTINENT OF THE UNITED STATES

FLEXIBLE CRINOIDS FROM THE UPPER ORDOVICIAN MAQUOKETA FORMATION OF THE NORTHERN MIDCONTINENT AND THE EVOLUTION OF EARLY FLEXIBLE CRINOIDS

A new pleurocystitid rhombiferan echinoderm from the Middle Ordovician Galena Group of northern Iowa and southern Minnesota

Homocrinid crinoids from the Upper Ordovician of northern Iowa and southern Minnesota

Carabocrinid crinoids from the Ordovician of northern Iowa and southern Minnesota

Dendrocrinid crinoids from the Ordovician of northern Iowa and southern Minnesota

Eoparisocrinid crinoids from the Middle Ordovician (Galena Group) of northern Iowa and southern Minnesota

Camerate crinoids from the Middle Ordovician (Galena Group, Dunleith Formation) of northern Iowa and southern Minnesota

Hybocrinid and disparid crinoids from the Middle Ordovician (Galena Group, Dunleith Formation) of northern Iowa and southern Minnesota