Pennsylvanian crinoids from Lake Bridgeport, Texas
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[1] James Wright. New Scottish Carboniferous Crinoids , 1936, Geological Magazine.
[2] James Wright. Some Variations in Ulocrinus and Hydreionocrinus , 1927, Geological Magazine.
[3] James Wright. Notes on the Anal Plates of Eupachycrinus calyx and Zeacrinus konincki , 1926, Geological Magazine.
[4] O. Jaekel. Phylogenie und System der Pelmatozoen , 1921 .