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First-time observations are submitted on the anatomy of the rhinoceros cardiac receptor apparatus. This is shown to comprise chemoreceptors in the form of canonical aortic and carotid glomera and mechanoreceptor areas essentially similar to those established for certain other mammalian forms. A description is given of the cardiac adventitial nerves

(aortic nerves) which provide a guide to receptor areas. The structure of the rhinoceros aortic glomus is detailed.