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AN INTRODUCTION TO ZOOLOGY. 



biting teeth, and-have their best development in the 

 rodents; the canines are the fighting teeth, and have 

 their best development in the Carnivora and other 

 animals that are combative; e.g. pigs, gorillas, and 

 some deer ; the molars are the chewing teeth, and 

 have a different development according to the kind of 

 food the animal eats. Thus, in the Primates, which 

 are frugivorous, the prominences on the top surface 

 or crown of the tooth, called casps, are rounded, so 



rig. 110.— Herbivorous dentition of Horse, Egttiis cdbdUus. Dental fonuQla, 

 314 13 

 — — - -; bnt one of the premolars is soon shed; canines radimentary in female. 



as to be suited for chewing foods which require to be 

 crushed (cf. fig. 109, 6, 7, 8). The molars of herbi- 

 vorous and carnivorous animals respectively present 

 characteristic features, which distinguish them from 

 molars of the frugivorous type, as well as from each 

 other. 



Herbivorous Dentition. In the typical Herbi- 

 vora, the tops of the molar teeth are divided into 

 sharp ridges, so as to chop the grass and herbage that 



