IXDK.X 



249 



Metaconule, 82 1, 89 ('ml '). 

 Metaconule, in Artiodaetyla. 46 , 17:!. 

 Metalopb, 73. 

 Metalophid, 73. 

 Metastyle, 80, 86, 89. 

 Microconodon, 18, 193. 

 Microlestes, 80, 93, 102, 103. 

 Mioclsenus, 109. 

 Mivart, 123, 124. 

 Mixodectes, 14."). 

 Mceritheriuiu, 1S7. 

 Molar cusps 



< >rder of appearance in Ontogeny, 

 4S-.11 ; terminology, 41, 63, US, 

 71, 76, 82, 224. 

 Mole, 209. 



Monotremata, 11, 10."). 

 Multitubereulata, 11, 80, 101, 115. 

 Mutation (von Waagen), 234. 

 Mylagaulus, 147. 

 Myogale, 119, 227. 

 Myrmecobius, 112. 

 Mystacoceti, l(i. 



Nomenclature of cusps, 41, 03, 08, 71, 

 76, 82, 224 ; of premolars, 1110 ; of 

 trituberculy, 89, 



Notharctus, 89, 160. 



Notoryctes, 113, 114. 



Odontoceti, 16. 



Olbodotes, 89. 



Ontogeny of the teeth, 48, 49, 51-55, 



63-65, 208-214. 

 OrnithorhynchuSj 105, 107. 

 Orthogenesis, 228, 239. 

 Osborn, 1-9. 



Pachylemuriens, 77. 



Palftolagus, 148, 150. 



Palseomastodon, 187. 



Paheontological theory (of molar develop- 

 ment), 5. 



Palaeotherium, 63. 



Pantolambda, 87, 165. 



Pantotheria, 12, 22. 



Paracone as oldest cusp, 8, 208-216, 221 ; 

 defined, 41. 



Paraconid defined, 41 ; reduction of, 103. 



Parallel evolution, 171", 137, 139. 



Parallelism, 229 1 . 



Parastyle, 89. 



Paurodon, 29, 219. 



Peralestes, 26. 



IVrameles, 1 13. 



Peramus, 24, 27. 2S. 



IVraspalax, 29. 



Peratherium, lo'.i. 



Periptychus, Hi I. 



Perissodactyla, 1"), 72, 174; cusp noincii- 



elature, 76. 

 Phalangerida', 111. 

 1'hascolestes, 24. 29, .SO. 

 Phascologale, 1 12. 

 Phenacodus, 17". 

 1'holidota, 13. 

 Piiinipedia, 13, 131, 143. 

 Placentalia, 100. 

 Plagiaulacidae, loo. 

 Plagiaulax, 24. 

 Plexodoiit theory, 201. 

 Polybuny theory, 4, 2U5. 

 Poly mastodon, 103. 

 Polyprotodontia, 111. 

 Potamogale, 119-126. 

 Potential homology, 236. 

 Premolar analogy theory, 7, 215, 223. 

 Premolars, 193 ; evolution, 172. 

 Primates, 14, 48, 56, 101, 157. 

 Proboscidea, 15, 1S6. 

 Proglires, 13, 144, 14.'). 

 Proscalops, 119, 121. 

 Proteodidelphys, 202. 

 Protocone, as oldest cusp, 49, 67, 217: 



as originally selenoid, 173 ; defined, 



41. 



Protoconid defined, 41. 

 Protoconule, 41, 82f, 89; defined, 41 ; 



(in Dryolestes), 223. 

 Protodont, 39, 89. 

 Protodonta, 11, 101. 

 Protogonodon, 169. 

 Protoloph, 69. 

 Prototheria, 11, ion. 

 Psittacotheriuin, 154. 

 Pteralopex, 129. 

 Ptilodus, 106. 

 Puerco mammals, 2. 

 Pyrotherium, 16, 190. 



Quad ritubercular, 89. 

 Quinquetubercular, 1 63. 



Rectigradations, 228, 239. 

 Rhinoceroses, 73, 76, 86, 176, 181-183. 

 Kodentia, 13, 144. 



