49 8 



INDEX 



Hexanchus, 338, 479 



— , head of, 358 



— , skull of, 283 



Hindbrain, 25, 41 



Hippocampal commissure, 155, 381 



— cortex, 380 

 Hoatzin, 321, 449 

 Holoblastic cleavage, 161, 173 

 Holocephali, 428 

 Holocephalous rib, 307 

 Holostei, 429 



Hominidae, 462 

 Homocercal tail, 64, 325 

 Homodont dentition, 138, 263 

 Homo heidelbergensis, 465 

 Homology, 477 

 Homo neanderthalensis , 465 



— rhodesiensis , 465 



— sapiens, 466 

 Homothermous, 404 

 " Honey-comb," 346 

 Horizontal septum, 53, 277, 307 

 Horn, 257, 260 



Horny teeth, 20, 195, 269 

 Humerus, 92, 301 

 Huxley's layer, 235 

 Hylambates, 352 

 Hylobates, 462 

 Hyoid arch, 48, 49,356 



— segmeat, 46, 49 



— sinus, 58 



— somite, 354 

 Hyomandibula, 48, 71, 73, 82, 298, 



300 

 Hyomandibular nerve, 46, 367 

 Hyostylic jaws, 49, 71, 283 

 Hypaphophyses, 121 

 Hypaxonic muscles, 277 

 Hyperdactyly, 322 

 Hyperphalangy, 322 

 Hyperpharyngeal groove, 10 

 Hypobranchial, 48, 69, 73, 300 

 Hypocentrum, 301, 304 

 Hypoglossal muscles, 53, 181, 356, 



370 



— nerve, 47, 113, 356, 370 

 Hypohyal, 71, 73, 300 

 Hypophysial cavity, 20, 25, 341, 401 



— fenestra, 281 

 Hypophysis, 61, 193, 399 

 Hypsodont teeth, 268 

 Hypural, 304, 324 

 Hyracoidea, 457 



Ichthyophis, 352 

 Ichthyopterygium, 314 

 Ichthyosaurus, 440 



Ichthyosaurus, gastralia of, 258 



— , skull of, 292 



Iguanodon, 442 



Ilio-sciatic foramen, 123 



Ilium, 93, 106, 123, 141, 301, 316 



Incisor, 138, 263 



Incus, 138, 298, 300 



Inferior commissure, 155 



— jugular sinus, 58 



— oblique muscle, 46, 361 



— rectus muscle, 46, 361 



— vena cava, 85, 97, 128, 147 



, devpt. of, 187, 218 



Inflected angle, 297 

 Infra-orbital gland, 145 

 Infundibulum, 25, 41, 61, 154, 193, 



400 

 Inner mass, 228, 254 

 Innominate artery, 128, 147 



— vein, 148 

 Insectivora, 456 

 Instinctive behaviour, 376 

 Intelligent behaviour, 382 

 Intercentra, 306 



Interclavicle, 106, 301, 309, 317 

 Interdorsal, 28, 50, 301, 302 

 Interhyal, 71, 73, 300 

 Intermediate cell-mass, 181, 188, 



220, 348 

 Intermedium, 93, 301 

 Internal carotid, 61, 78, 109, 327, 



334 



— rectus muscle, 46, 361 

 Interoceptors, 364 

 Interopercular, 71, 73 

 Inter-renal, 62, 101,401 

 Interventral, 301, 302 

 Invagination, 162, 177 

 Inverted retina, 24 

 Involuntary muscle, 55, 271, 364, 



384 

 Ipnops, 394 

 Iris, 40 



Ischio-pubic foramen, 106 

 Ischium, 93, 106, 123, 141, 301 

 Islets of Langerhans, 152, 402 

 Isopedin, 259 



Jacobson's organ, 115, 396 

 Jaw-muscles, 55, 271, 357, 368 

 Jugal, 135, 300 

 Jugular vein, 58, 97, 128, 187 



Kiwi, 450 



Kolliker's pit, 8, 16, 163 



Labyrinthodontia, 258, 434 



