INDEX 



Ictidopsis, dentary of. Fig. 21, 37; 

 restoration of face of, frontis- 

 piece; skull of. Fig. 20, 35; 

 Fig, 28, 49; Fig. 48, 78 

 Incisors, of anthropoids and 

 monkeys, 138; mammillae on, 

 136; Fig. 72, 137; of chimpan- 

 zees, 138; of cynodonts. Fig. 

 50, 80, 116; central, of gorilla, 

 Fig, 72, 137; of Neanderthal 

 man (Le Moustier), Fig. 72, 

 137; of Neanderthal man 

 (Ehringsdorf), Fig. 72, 137; 

 of old Egyptian, Fig. 72, 137; 

 of white boy. Fig. 72, 137; 

 upper central, of man, three 

 types of, 138; Fig. 73, 139; 

 "shovel-shaped," of the 

 Krapina race, Mongolians 

 and Indians, 138; retreat of 

 human, 144; of fossil man, 

 143; origin of, 90 



Incus, human embryo shows origin 

 of, 220 

 of armadillo, foetal. Fig. 114, 221 

 of Cynognathus, Fig. 113, 218 

 of hedgehog (Erinaceus), foetal. 



Fig. 115, 221 

 of man. Fig. Ill, 216 

 of man, foetal. Fig. 115, 221 

 of Perameles, fcetal. Fig. 113, 

 218 



Indians, "shovel-shaped" incisors 

 of. 138 



Indrodon, left upper molar of. 

 Fig. 38, 62 



Infusoria, effect of ultra-violet 

 rays on, 174 



Inheritance, of individual char- 

 acters, 236 



Insectivores, ancestors of man 

 were, 52 



Insectivorous dentition, traces of, 

 in early primates, 57 



Insects, compound eyes of, 178 



Interarticular disc, formation of, 

 in Perameles, Fig. 22, 38 



Interoperculum, elimination of. 

 Fig. 17, 30, 114 



Interorbital space, in advanced 

 lemuroids, 60 



Interparietal bones, retained from 

 fish to man, 86 



Intertemporal bone, its changes 

 from fish to man. Fig. 49, 79; 



loss of, in reptiles, 89; re- 

 duction of, 88 



Invertebrates, well established be- 

 fore vertebrates, 8; eyes of, 

 173; eyes compared with ver- 

 tebrate, 178; eyes of higher, 

 178 



Iris, of man. Fig. 100, 193; of 

 mollusca, development of. 

 Fig. 95, 181; of Sepia, 180; 

 of shark. Fig. 99, 192 



Jacobson's organ, description of 

 158; in man, foetal. Fig. 65, 

 120; Fig. 82, 159 



Jaw, conclusions from history of 

 the, 152; elements traced 

 from earliest Amphibia to 

 man, 107; evolution of the 

 bones of the, 87; Evolution 

 of the Human, Fig. '50, 

 80; evolution of the primate, 

 63; mammalian joint of, its 

 formation, 39; the interartic- 

 ular disc in {Perameles, foetal). 

 Fig. 22, 38; its elements 

 homologous in crossopts and 

 early Amphibia, 107; laby- 

 rinthodont method of attach- 

 ment of teeth in, 112; points 

 of advancement in crossopt 

 jaws, 113; prognathous jaws 

 and shape of nose, 170; Fig. 

 89, facing 170; primate, 

 tabular history of. Fig. 37, 

 61; origin uncertain below 

 ostracoderms, 101; of dipnoan 

 fishes, 25; of fossil ganoids, 

 23; of Osteolepis, Fig. 11, 

 facing 22; architecture of 

 "visceral arches," 104; pro- 

 gressive changes associated 

 with development of mus- 

 culature of, 116; of shark 

 nearer to those of man than 

 to invertebrate, 102; special- 

 ized jaws of some Amphibia, 

 115 

 Primary, completely masked by 

 secondary jaws in higher 

 vertebrates, 104, 106; of 

 crossopts, 106, 110, 113; of 

 higher fishes and early Am- 

 phibia, covered with ganoine- 

 coated bony plates, 106; of 



273 



