A descriptive account is given of the cardiac anatomy of a Sumatran rhinoceros with special reference to the cardiac conducting system, hitherto undescribed for the Rhinocerotidae. In the specimen studied this system manifests a well-developed Tawara network of Purkinje tissue, marked by obtrusive taeniae vagae, and a comparable atrial network. The sinu-atrial and atrio-ventricular nodes are connected by a Wenckebach bundle. The primary dextral and sinistral branches of the Kent-His bundle arise directly from the atrioventricular node. In its general constitution the heart closely resembles its equid counterpart.