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Gregory J.W. (1931). Hydroconophora and Hydrokerion: two new genera of cretaceous Hydractinidae. Annales and Magazine of Natural History. 8: 475-484.
Gregory J.W. (1931). Hydroconophora and Hydrokerion: two new genera of cretaceous Hydractinidae. Annales and Magazine of Natural History. 8: 475-484.