INDEX 



803 



Dipus, 659. 

 Direction-finding, bats, 566. 



birds, 493. 

 Discoglossus, 313. 

 Disphclidus, 415. 

 Display, birds, 481, 497. 

 Dissacus, 684. 

 Distraction display, 502. 



DOBHZANSKY, T., 122. 



Docodonta, 546. 



Dodo, 519. 



Dogfish, 134, 181, 250. 



Dogs, 685. 



Dolichosaurs, 409. 



Dolichosoma, 361. 



Doliolum, 70, 72. 



Dolphin, 666. 



Doras, 250. 



Dorypterus, 231. 



Draco, 407, 426. 



Drift nets, 283. 



Dromiceius, 514. 



Dromocyon, 684. 



Drum fish, 218. 



Dryopithecus, 632. 



Duck, 437, 467, 497, 517, 778. 



Duck-bills, 778. 



Ducts, genital, see Reproduction. 



Dugong, 720. 



Dymantic coloration, 302. 



Eagle, 456, 517. 



Eagle-ray, 250. 



Ear, actinopterygii, 216, 489. 



amphibia, 327, 353, 489. 



bats, 588. 



birds, 488. 



chelonia, 398. 



elasmobranchs, 171. 



Lampetra, 109. 



mammals, 489. 



monotremes, 550. 



reptiles, 378, 385, 407, 411. 



snakes, 411. 



stegocephalia, 327. 



synapsids, 542. 



whales, 668, 671. 

 Echidna, 549. 

 Echinoderms, 49, 57, 75. 

 Echo-sounding, bats, 588. 



birds, 489. 



whales, 672. 

 Ecliptic, changes, 14. 

 Edaphosanrus, 540. 

 Edentata, 592. 

 Eel, 133, 226, 237, 246, 261. 

 Efficiency of organisms, 10, 769, 775. 

 Egg tooth, 382, 553. 

 Eggs, amphibia, 341, 365, 366. 



actinopterygii, 265, 283. 



amphioxus, 42. 



birds, 475, 507. 



chelonia, 397. 



dipnoi, 278. 



elasmobranchs, 163, 180, 181. 



hag-fishes, 124. 



lampreys, 113. 



marsupials, 560. 



monotremes, 551. 



reptiles, 381, 421, 430. 



seals, 692. 

 Eland, 763. 

 Elapidae, 415. 



Elasmobranchs, 131, 175, 772. 

 Electric organ, actinopterygii, 253. 



cephalaspida, 127. 



Torpedo, 182. 

 Electrophorus, 254. 

 Elephant, 706, 709. 

 Elephant-bird, 514. 

 Elephant-shrews, 584. 

 Elephas, 706. 

 Elpistotege, 326, 356. 

 Embolomeri, 357. 

 Embrithopoda, 718. 

 Emu, 514. 



Emys, 380, 393, 396. 

 Endostyle, amphioxus, 32, 44. 



Ciona, 61. 



evolution of, 76. 



Lampetra, 1 17. 

 Energy flux, increase of, 10, 769. 

 Entelodon, 748. 

 Enterocoele, 48. 

 Enteropneusta, 50. 

 Entosphenus , 121. 

 Enzymes, see Digestion. 

 Eodelphis, 563. 



Eogyrinus, 297, 309, 357, 774. 

 Eohippus, 726. 

 Eosuchia, 402. 

 Eotitanops, 730. 

 Eotragus, 761. 

 Epicardium, 63, 66, 68. 

 Epihippus, 726, 736. 

 Equus, 732, 774. 

 Erinaceus, 583. 

 Erithacus, 482. 

 Eryops, 297, 359, 522. 

 Esox, 221, 237, 251. 

 Eunotosauras, 399. 

 Euparkeria, 510. 

 Easthenopteron, 268, 307, 314. 

 Eutheria, origin of, 574. 

 Evolution, absence of, 771. 



adaptive radiation, 244, 366. 



convergent, 777. 



definition, 8. 



