;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- 

 dcEum 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, 6 ^9 



Ductus Botalli, 648 



Ductus Cuvieri, 654 



Ductus venosus Arantii, 663 



Dugong, heart of, 642 



Dysticus, eye of, 481 



Ear, see 'Auditory organ' 



Echinoclermata, 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 ; gastrula of, 281 ; de- 

 velopment of mesoblast of, 294 ; noto- 

 chorcl 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 



Elreoblast of Pyrosoma, 28; Salpa, 30 



Elephant, placenta of, 249 



Embolic formation of gastrula, 333 



Enamel organ, 777 



Endolymph of ear, 522 



Endostosis, 543 



Endostyle of 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 Coalenterata, 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, 1 35 ; 

 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 Chcetopoda, 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 



