New Chesterian (Upper Mississippian) crinoids from Illinois

12 p., 3 pl.http://paleo.ku.edu/contributions.htm

Middle Pennsylvanian (Atokan) crinoids from Oklahoma and Missouri

30 p., 17 fig.http://paleo.ku.edu/contributions.htm

The Crinoid Genus Sygcaulocrinus from Iowa

Attention is called to the synonomy of Ectenocrinus elongatus Thomas and Ladd, 1926, with Sygcaulocrinus typus Ulrich, 1924, both from the Ft. Atkinson Member, Maquoketa Formation (Ordovician), and to the probable bottom dwelling habitat of the species. Comparison is made with some Upper Paleozoic crinoids which are known to have been bottom dwellers. An accident in preparation of a specimen disclosed the solid base of the cup and the solid summit of the proximal columnal, both of which are illustrated

A New Occurrence of the Inadunate Crinoid Genus Microcaracrinus

A crown of the rare crinoid genus Microcaracrinus is reported for the first time from Oklahoma as M. pratti n. sp. It is from a northern extension of the Avant Formation exposed in Washington County, Oklahoma. Discussion of possible affinities of the genus is included

Fossil crinoid studies

54 p., 30 fig.http://paleo.ku.edu/contributions.htm

New Flexible Crinoids from The Upper Devonian of North Central Iowa

Complete crinoid dorsal cups and crowns are virtually unknown from the Lime Creek Formation and Amana beds except for one partial crown of Dactylocrinus stellatimbasalis (Thomas) 1924. A partial and a complete crown and one dorsal cup belonging to Apodactylocrinus Strimple and Levorson, new genus, are described as A. keithi Strimple and Levorson, n. sp. and A. amanaensis Strimple and Levorson, n. sp

Echinoderm Zonules in the Devonian of Iowa

A tentative framework of ten echinoderm zonules, some of which are not new, is proposed: Nortonechinus owensis Zonule (upper Owen Member, Lime Creek Formation): Dactylocrinus Zonule (upper Cerro Gordo Member), Xenocidaris Zonule (lower Cerro Gordo Member, Lime Creek Formation); Desmidocrinus Zonule, Belanskicrinus Zonule, Agelacrinites Zonule (Mason City Member, Shell Rock Formation); Strobilocystites Zonule, Euryocrinus Zonule (upper Rapid Member), Hexacrinites Zonule (middle Rapid Member), Megistocrinus clarki Zonule (lower Rapid Member, Cedar Valley Formation). Some forms, or assemblages, appear to have decided stratigraphic significance, but more study is needed

Some Late Pennsylvanian (Virgilian) Crinoids from Southeastern Nebraska and Southwestern Iowa

Virgilian age rocks of lowa and Nebraska contain important crinoid faunas and current collections help to establish distributions and tentative ranges of numerous species. A middle limestone-core shale fauna from the Cass Formation of Nebraska provides small, usually inornate species with close Missourian affinities. Other crinoids studied are from outside shales and upper limestones of the cyclothem and these are usually large, ornate species. Biserial arms are reported for the first time for Sublobalocrinus Knapp. The first report of flexible crinoids from Virgilian strata of the Iowa-Nebraska area is made here. Current collections of crinoids contain 40 species and 31 genera representing 19 families: new species or subspecies are; Isoallagecrinus bassleri intermedius, Graffhamierinus gratesquus, Arrectocrinus iowensis, Pyndoxocrinus inornatus, Sublobacrinus kaseri, Contocrinus invaginatus, Apographiocrinus platybasis. The species Aesiocrinus luxuris is referred to the genus Moundocrinus

Crinoids of the LaSalle Limestone (Pennsylvanian) of Illinois

48 p., 23 pl., 19 fig.http://paleo.ku.edu/contributions.htm

Lower Pennsylvanian (Morrowan) crinoids from Arkansas, Oklahoma, and Texas

84 p., 18 pl., 7 fig.http://paleo.ku.edu/contributions.htm