INDEX 



691 



Electric organs, 171, 226 

 Electric rays, 165, 172, 174 

 Elephant, African, 524, 550 

 Elephants, 469, 476, 490, 541, 550, 580 

 Elephas, 469 



Elephas africanus, 524, 550 

 Elevator muscles, 267* 

 Elimination of the unfit, 634* 

 Embryological evidence of evolution, 



624 



Embryon ectoderm, 570* 

 Embryon eiidoderm, 570* 

 Embryonal knot, 569* 

 Embryonic membranes, of Bird, 427, 



428 



Embryonic rim, 177* 

 Embryonic shield, 352*, 424 

 Empedocles, 654 



Emus, 398, 408, 409, 413, 417, 419, 429 

 Emys europcea, 340, 343, 346 

 Enamel, 83 



Enamel membrane, 542 

 Enamel organ, 83, 84*, 541 

 Enamel pulp, 542 

 Ericephalocoele, 47, 52* 

 End-buds, 104* 

 Endemic, 602* 



Endochondral ossification, 76* 

 Endolymph, 111* 

 Endolymphatic duct, 111*, 112 

 Endoskeleton See Skeleton 

 Endostyle, of Tornaria, 9 : Ascidia, 

 16, 17*, 18 : Appendicularia, 23 : 

 Doliolum, 26 : Ascidian larva, 35, 

 36 : of Amphioxus, 44, 46, 60, 62 

 Engceus, 602 



Entepicondylar foramen, 512* 

 Enteric canal See Digestive Organs 

 Enterocoele, of Amphioxus, 57 

 Enteropneusta, 2*, 3, 4, 5, 6, 7, 8, 9 

 Entocuneiform, 444- See Limb -skele- 

 ton 



Entoplastron, 335* 

 Eocene, 620 

 Eosiren, 620 

 Eozoon canadense, 618 

 Epencephalon, 97 

 Ependyme, 97*, 99 

 Epiboly, 131*, 210, 280 

 Epibranchial, of Craniata, 74, 76* 

 Epicentrals, 222* 

 Epiccele, 97, 174 

 Epicoracoid, 264 : Prototheria, 502, 



505 



Epicrium, 285 



Epidermis, of Amphioxus, 45 : Crani- 

 ata, 67 



Epididymis, 159, 322, 323, 460 

 Epigastric vein, 315, 316 

 Epiglottis, of Rabbit, 448 : Mam- 

 malia, 558 



Epiglottis, intra-narial, 558 



Epigonichthys, 43 



Epihyal, of Craniata, 74, 76*, 199, 

 201 



Epineurals, 222* 



Epiotic, of Craniata, 77* 



Epipharyngeal groove, Amphioxus, 46 



Epiphyses, of Craniata, 82* : Rabbit, 

 434 : Mammals, 496 



Epiphysis (cerebri), of Craniata, 99* : 

 of Elasmobranchii, 173 



Epiplastron, 335* 



Epipleurals, 222* 



Epipterygoid, 308, 309, 337 



Epipubic bones, 502, 505*, 507, 508 



Epipubic process, 170 



Epipubis, 294, 295, 312, 507 : Birds, 

 419 



Episternum, of Lizard, 310*, 311 

 Rabbit, 436 : Prototheria, 503 



Equidce, 468, 488, 489 



Equus burchelli, 488 



Equus caballus, 521, 526, 527, 549 



Erinaceidce, 471 See Hedgehogs 



Esox, 620 



Ethiopian region, 609 



Ethmoidal plane, 498* 



Ethmo-turbinals, 437, 438* See Skull 



Ethology, of Elasmobranchii, 181 : 

 Ceratodus, 239 : Reptiles, 354 : 

 Birds, 430 



Euchorda, 42* 



Eudynamis taitensis, 606 



Eudyptes, 402 



Eudyptes antipodum, 402 



Eudyptes pachyrhynchus, 413 



Euselachii, 164* 



Eustachian aperture, 439 



Eustachian tubes, of Frog, 268 : Rab- 

 bit, 439 : of Mammals, 563*, 564 



Eustachian valve, 449, 557* 



Eutheria, 465*, 558, 561, 562, 565, 567, 

 569, 577 



Evolution, 624 



Excretion, organs of, in Ascidia, 20 : 

 Simple Ascidians, 30 : Amphioxus, 

 50, 51 See Urinogenital Organs 



Ex-occipital, 77* See Skull 



Exococtus, 219 



Exoskeleton, of Craniata, 70 



Expiration, 193* 



Extensor muscles, 266* 



Extensores dorsi muscles, 266 



External auditory meatus, 369 

 External characters, of Balanoglossus, 

 1 : Ascidia, 14 : Craniata, 65 : 

 Lamprey, 120 : Dogfish, 140 : 

 Elasmobranchii, 165 : Holocephali, 

 183 : Trout, 192 : Teleostomi, 217 : 

 Ceratodus, 240 : Frog, 257 : Am- 

 phibia, 285 : Lizard, 304 : Reptilia, 



