;8 4 



INDEX. 



Diaphragm, 631 ; muscle of, 676 



Dipnoi, nares of, 534; vertebral column 

 of, 548; membrane bones of skull of, 

 592 ; heart of, 638 ; arterial system of, 

 645 ; excretory system of, 707 ; stomo- 

 daeum of, 777 



Diptera, eye of, 481 



Discophora, excretory organs of, 687 



Dog, placenta of, 248 



Dohrn, on relations of Cyclostomata, 84; 

 on ancestor of Chordata, 311, 319 



Doliolum, development of, 28 



Ductus arteriosus, 649 



Ductus Botalli, 648 



Ductus Cuvieri, 654 



Ductus venosus Arantii, 663 



Dugong, heart of, 642 



Dysticus, eye of, 481 



Ear, see 'Auditory organ' 



Echinodermata, secondary symmetry of 

 larva of, 380 ; excretory organs of, 689 ; 

 generative ducts of, 752 



Echinorhinus, lateral line of, 539; verte- 

 bral column of, 548 



Echiurus, excretory organs of, 686 



Ectostosis, 543 



Edentata, placenta of, 248, 250, 256 



Eel, generative ducts of, 703 



Egg-shell of Elasmobranchii, 40 ; Chick, 

 146 



Elasmobranchii, development of, 40; vi- 

 viparous, 40; general features of de- 

 velopment of, 55 ; gastrulaof, 281 ; de- 

 velopment of mesoblast of, 294 ; noto- 

 chord of, 294 ; meaning of formation of 

 mesoblast of, 295; restiform tracts of, 

 425 ; optic lobes of, 427 ; cerebellum of, 

 425 ; pineal gland of, 432 ; pituitary 

 body of, 435 ; cerebrum of, 438 ; olfac- 

 tory lobes of, 444 ; spinal nerves, 449 ; 

 cranial nerves of, 457; sympathetic 

 nervous system of, 466; nares of, 533; 

 lateral line of, 539 ; vertebral column of, 

 549 ; ribs of, 560 ; parachordals of, 567 ; 

 mandibular and hyoid arches of, 576; 

 pectoral girdle of, 600 ; pelvic girdle of, 

 607; limbs of, 609; pericardial cavity 

 of, 627 ; arterial system of, 644 ; venous 

 system of, 65 1 ; muscle-plates of, 668 ; 

 excretory organs of, 690; constitution 

 of excretory organs in adult of, 697; 

 spermatozoa of, 747; swimming-blad- 

 der of, 763 ; intestines of, 767 ; liver of, 

 769; postanal gut of, 772 



Eloeoblast of Pyrosoma, 28; Salpa, 30 



Elephant, placenta of, 249 



Embolic formation of gastrula, 333 



Enamel organ, 777 



Endolymph of ear, 522 



Endostosis, 543 



Endostyleof Ascidia, 18, 759; Pyrosoma, 

 25; Salpa, 32 



Epiblast, of Elasmobranchii, 47; Tele- 

 ostei, 71, 75; Petromyzon, 86; Lepid- 



osteus, 112; Amphibia, 122, 125; 

 Chick, 149, 166 ; Lacerta, 203 ; Rabbit, 

 216, 219; origin of in Rabbit, 221 ; 

 comparative account of development 

 of, 300 



Epibolic formation of gastrula, 334 



Epichordal formation of vertebral column, 

 556 



Epicrium glutinosum, 143 



Epidermis, in Ccelenterata, 393; protec- 

 tive structures of, 394 



Epididymis, 724 



Epigastric vein, 653 



Episkeletal muscles, 676 



Episternum, 602 



Epoophoron, 725 



Ethmoid bone, 597 



Ethmoid region of skull, 570 



Ethmopalatine ligament of Elasmo- 

 branchs, 576 



Euphausia, eye of, 483 



Eustachian tube, of Amphibia, 135; 

 Chick, 180; Rabbit, 232; general 

 development of, 528 



Excretory organs, general constitution of, 

 680; of Platyelminthes, 680; of Mol- 

 lusca, 681 ; of Polyzoa, 682 ; of Bra- 

 chiopoda, 683 ; of Chsetopoda, 683 ; of 

 Gephyrea, 686 ; of Discophora, 687 ; of 

 Arthropoda, 688; of Nematoda, 689; 

 of Echinodermata, 689 ; constitution of 

 in Craniata, 689 ; of Elasmobranchii, 

 690; constitution of in adult Elasmo- 

 branch, 697; of Petromyzon, 700; of 

 Myxine, 701 ; of Teleostei, 701 ; of 

 Ganoidei, 704; of Dipnoi, 707; of 

 Amphibia, 707; of Amniota, 713; 

 comparison of Vertebrate and Inverte- 

 brate, 737 



Excretory system, of Elasmobranchii, 49 ; 

 Teleostei, 78 ; Petromyzon, 95, 98 ; 

 Acipenser, 99; Amphibia, 133 



Exoccipital bone, 595 



Exoskeleton, dermal, 393 395 ; epider- 

 mal, 393396 



External generative organs, 726 



Extra-branchial skeleton, 572 



Eye, of Ascidia, 16; Salpa, 31; Elasmo- 

 branchii, 56, 57, 58; Teleostei, 73; 

 Petromyzon, 92, 98; Aves, 170; Rab- 

 bit, 229; general development of, 470; 

 evolution of, 470, 471; simple, 480; 

 compound, 481 ; aconous, 482 ; pseuclo- 

 conous, 482; of Invertebrata, 471; of 

 Vertebrata, 483; comparative develop- 

 ment of Vertebrate, 497 ; of Ammo- 

 ccetes, 497 ; of Tunicata, 507 ; of Chor- 

 data, general views on, 508 ; accessory 

 eyes of Fishes, 509; muscles of, 677 



Eyelids, development of, 506 



Falciform ligament, 757 



Falx cerebri, 439 



Fasciculi teretes, of Elasmobranchii, 426 



Feathers, development of, 396 



