INDEX 



513 



Decompression, 



bulging of area of, 450, 454 

 subtemporal, 456 



subtentorial, 449 

 Decussatio epiphysis of Acipenser, 212 

 Deep-sea fishes, luminous organs of, 23 

 Defective nutrition, 47 

 Defects, inheritance of, 47 

 Degeneration of organs of special sense, 131 

 Degenerative changes, 



in ontogeny, 355 



in phylogeny, 355 

 Deiphon, 138 



Deleterious agents, effects on growth, 36 

 Dendrocoelum lactea, eyes of, 25 

 Dentalium, 161 

 Dentine, 341 



orthodentine, 341 



osteodentine, 341 

 Dermal bones, articulations between, 472 

 Destnognathus, 226 

 Development, 



arrest of, 225, 284 



parallel, 354 

 Devolutionary changes in eyes of trilobites, 



146 

 Dichotomy, artificial production of, 38 

 Dicynodon kolbei, 300 

 Didymaspis, 191 

 Diencephalon, roof of, 180 

 Dinichthys intermedins, 181, 182, 330 

 Dinocephalia, 300 

 Diplocaulus magnicornis, 235 

 Diplodontus, eyes of, 129 

 Diplopia, 453, 460, 463 

 Diplopterus, 337 

 Dipnoi, 200, 335 



extinct, 336 



pineal region of, 221 

 Dipnorhynchns, 200, 245, 327 

 3.4-dioxyphenylalanin, 60 

 Diprosopus, 



Duplicitas anterior, 33 



triophthabnos, 256 

 Dipterus, 336 

 Diverticula, 



from epiphysis of Anura, 234 



pineal, 196, 213, 218, 228 



primary, 289 



secondary, 289 

 Diverticulum, pineal, 211, 228, 229 

 Dogfish, spiny, 204 

 Dolichosoma longissitnum, fusion of frontal 



and parietal bones, 236 

 Doliolum, 168 

 " dopa " 



reagent, 60 



oxidase, 60 

 Dorsal diverticulum, 307, 308, 311, 416, 



465 

 Dorsal sac, 180, 184, 240, 244 

 of Chelydra serpentina, 286 

 of Polypterus, 216 

 of Sphenodon, 314, 369 

 of Testudo geometrica, 252 

 of Tropidonotus, 251, 285 



33 



Dorsal shield, 



of Aptts, 104 



of Limulus, 103, 108 



of Lepidnrus, 106 

 Downtonian strata, of Ringerike, 345, 347 

 Draco volans, 252, 272, 273 

 Dragon fly, 352 



number of facets in eye of, 116 

 Drowsiness, 454 

 Duplicitas, 



anterior, 33, 41, 43, 44 



cruciata, 34, 35 



posterior, 32, 44 

 Dwarfism, 427 

 Dytiscus, 



ocellus of young larva, 10 



marginalis, compound eye of, 118, 119 

 larval ocelli of, 117 

 retinula;, 117 



Echidna, 323 



Echinodermata, eyes of, 93 

 Ectdyses, 474 



Edinger-Westphal nucleus, 437 

 Edriophthalmia, 342 

 Elasmobranchs, pineal organ of, 204 

 Electric field, 



dorsal, 328 



lateral, 328 

 Ellipsocephalus, 136 

 Emys europea, 468 

 Enamel, 342, 474 

 Encrinurus, 136 

 Endocrine 



functions of pineal body, 424 



organs, evolution of, 245 

 Endolymphatic duct, perforation of roof 



of skull by, 209 

 Endostyle, 176 

 End-vesicle, 73, 244 



of Agamidce, 273 



of cartilaginous fishes, 207 



degeneration of, 231 



of Polypterus bichir, 217 



of Protopterus, 223 



of Pseudopus, 244 



of Teleostean fishes, 217, 219, 220 



of Rana temporaria, 228 

 Endoskeleton, 



of arachnids, 163 



cartilaginous, of extinct fishes, 472 



of chaetopods, 163 



of Crustacea, 163 



of Nautilus, 163 



of Sepia, 163, 164 

 Enteropneusta, 168 



Entomostracan eye, 360, 361, 362, 369 

 Entosternite, 



of Limulus, 163 



of Scorpio, 163 

 Eosphceroma, 342 

 Epeira diaderma, 124 

 Ependyma, 191, 206, 211 



definitive, 385 



functions of, 388 



