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Reversion, perhaps the cause of some bad dispositions. Rhagium, difference of colour in the sexes of a species of. Rhamphastos carinatus. Rhea Darwinii. Rhinoceros, nakedness of; horns of; horns of, used defensively; attacking white or grey horses. Rhynchaea, sexes and young of. Rhynchaea australis. Rhynchaea bengalensis. Rhynchaea capensis. Rhythm, perception of, by animals.
Yet the northern character of the Norwich Crag is not fully shown by simply saying that it contains twelve northern species. It is the predominance of certain genera and species, such as Tellina calcarea, Astarte borealis, Scalaria groenlandica, and Fusus carinatus, which satisfies the mind of a conchologist as to the arctic character of the Norwich Crag.
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