Spencer, W. K. (1905). A Monograph of the British Fossil Echinodermata from the Cretaceous formations. Volume second: The Asteroidea and Ophiuroidea. Paleontographical Society Monographs. 2(4): 91-132.
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Spencer, W. K.
1905
A Monograph of the British Fossil Echinodermata from the Cretaceous formations. Volume second: The Asteroidea and Ophiuroidea