File:Heller, The White Rhinoceros (1913), Pl. 13.jpg

Illustrating generic characters

• Fig. 1. Coelodonta antiquitatis, adult; from the Pleistocene of the Tunguska River, Siberia. No. 6053, U. S. National Museum.

Tips of premaxillae and nasals broadly united into a solid bridge ; teeth with central fossettes of enamel filled by cement; vomer thickened.

• Fig. 2. Ceratotherium simum cottoni, female, old ; from Rhino Camp, Lado Enclave; weathered skull. No. 164597, U. S. National Museum.

Teeth with central fossettes of enamel and cement ; three upper premolars ; vomer thin and knife like ; occipital crest produced beyond condyles.

• Fig. 3. Diceros bicornis, male, old ; Loita Plains, Southern Guaso Nyiro District, British East Africa; shot by Col. Theodore Roosevelt, June 18, 1909. No. 162930, U. S. National Museum.

Teeth without fossettes, the folds remaining open ; four upper premolars ; sphenoidal process of basi-occipital large.

• Fig. 4. Rhinoceros unicornis, immature; the milk molars in use; only the first molar erupted; permanent incisors just erupting; from the menagerie of Barnum and Bailey; sex and origin unknown;. No. 16251, U. S. National Museum.

Teeth with one or two central fossettes, but without the cement