R. G. S. Hudson; "Gerontic" structures in the Carboniferous coral Rotiphyllum costatum (McCoy). Geological Magazine ; 80 (1): 23–29. doi:
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Specimens from Cawdor quarry, Derbyshire, England, identified as Zaphrentis costata and redescribed are referred to Rotiphyllum. The significance of certain structural modifications in a particular specimen is discussed.
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