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Cosmine is a unique combination of dentine, enameloid and, at least in the functional sense, some true bone, with the pore-canal sensory system, and is found only in certain early fishes….
Thomson, Keith S.. 1975. "On the biology of cosmine." Bulletin of the Peabody Museum of Natural History , (40). https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/40