INDEX 



691 



Electric organs, 171, 226 



Electric rays, 165, 172, 174 



Elephant, African, 524, 550 



Elephants, 469, 47G, 490, 541, 550, 580 



Elephas, 4fi!) 



ElcpJuifj iifrii-iiiiiift, 524, 550 



Elevator muscles, 267* 



Elimination of the unfit, 634* 



Embryological evidence of evolution, 

 624 



Embryoii ectoderm, 570* 



Embryoii endoderm, 570* 



Embryonal knot, 569* 



Embryonic membranes, of Bird, 427, 

 428 



Embryonic rim, 177* 



Embryonic shield, 352*, 424 



Empedocles, (554 



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



Emys eitropcea, 340, 343, 346 



Enamel, 83 



Enamel membrane, 542 



Enamel organ, 83, 84*, 541 



Enamel pulp, 542 



Encephaloccele, 47, 52* 



End-buds, 104* 



Endemic, 602* 



Endochondral ossification, 76* 



Eiidolymph, 111* 



Endolymphatic duct, 111*, 112 



Eiidoskeleton See Skeleton 



Endostyle, of Tornaria, 9 : Asci flirt, 

 16, 17*, 18 : Appendicularia, 23 : 

 Doliolum, 26 : Ascidiaii 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* 



Epicoele, 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 Babbit, 448 : Mam- 

 malia, 558 



Epiglottis, intra-narial, 558 



EI> i //o i / ickt/i. )/#, 4 : ! 



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

 201 



Epineurals, 222* 



Epiotic, of Cranial a. 77* 



Epipharyngeal groove, Ai/i///n.rn.~i, 46 



Epiphyses. of (Yanmta, 82*: Rabbit, 

 434 : Mammals, 4!t(i 



E|ii|>hysis (wivbri), 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 



EquidfE, 468, 488. 489 



EHUUS 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 Elasmohranrliii, 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 



Exoccrtus, 219 



Exoskeleton, of Craniata, 70 



Expiration, 193* 



Extensor muscles, 266* 



Extensores dorsi muscles, 26(5 



External auditory meatus, 369 



External characters, of Balanorjlossus, 

 1 : Ascidia, 14 : Craniata, l>.~) : 

 Lamprey, 120 : Dogfish, 140 : 

 Elasmobranchii, 165 : Holocephali, 

 183 : Trout, 192 : Telcostomi, 217 : 

 Ceratodus, 240 : Frog, 257 : Am- 

 phibia, 285 : Lizard, 304 : Reptilia, 



