XIV 



LIST OF ILLUSTRATIONS 



FIO. 



192. Accessory cusps in molars of Egyptian .... 



193. Upper teeth of young Gorilla 



194. Mandible of Orang-utan with "geminated" tooth . 



195. Mandible of Orang-utan with additional tooth 



196. Maxilla of Orang-utan ....... 



197. Mandible of aboriginal native of Australia 



198. Tracings of molar teeth. (From Kramberger) . 



199. Diagrams to illustrate Bolk's theory of molar teeth. (After Bolk) 



200. Molariform teeth of Diademodon. (After Osborn) . 



201. Cranium of Sesamodon browni. (After Broom) 



202. Dentition of aboriginal native of Australia 



203. Molar teeth of Periptychus. (From Osborn) . 



204. Diagram illustrating the origin of the tritubercular form 



tooth. (From Osborn) 



205. Diagrams of cusp-rotation of lower molar teeth. (After Osborn) 



206. Molar teeth of Dryolestes 



207. Human molar teeth ........ 



208. Molar teeth of Ornithorhynchus. (After Thomas and Osborn 



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