The Perissodactyla — Rhinoceros. 



31 



Family Rhixocerotimi. — Tlie Rhinoceroses occupy Pier-cases Rhinoceros. 

 Xos. 6, 7, and 8, and Table-case ]S"o. 4. There is only a single living pier-cases, 



Nos. 6, 7, ' 



ABC and ®j an< * 



Table-case, 

 No. 4. 



Fig. 38. — Examples of modifications of the bones in the Perissodactyle Fore-foot 



(after Flower).* 



A, Tapir. B, Rhinoceros. C, Horse. 



R = radius; U=ulna; c = cuneiform; Z=lunar; 6 = scaphoid ; u = unciform; w = magnum; 



td = trapezoid; <»i=trapezium. 



The Roman numerals indicate the corresponding toes present in each foot. 



genus, -which includes five or six known species ; many genera 

 have been described from fossil remains, but probably some 

 of these might well be referred to Rhinoceros also. 



The Rhinoceros is a large herbivorous animal with an 

 extremely thick skin, marked by deep folds ; there are seven 

 upper and seven lower molar teeth on each side ; no canine teeth 

 are developed, but there are usually incisor teeth in both jaws;f 

 generally one or two horns are present, but some of the earlier 

 extinct species were hornless. The longest horn is fixed on the 

 bones of the snout (nasal bones), the shorter behind it, on the 

 frontal bones. The horns have no bony centre or horn-core 



* Reproduced by permission from Sir William Flower's "Osteology of 

 the Mammalia," p. 295, third Edition, 1885. 



t Incisor teeth are absent in the adult African Rhinoceroses, but the Indian 

 - have a pair of large upper incisors, and two large and two small lower 

 ones. See the fine series of skeletons of the living species in the Recent 

 Osteological Gallery on the West side, second floor. 



