646 



INDEX. 



rninal pores of, 515 ; segmental duct of, 

 577; pronephros of, 577; mesonephros 

 of, 577; generative ducts of, 603, 616; 

 venous system of, 535; excretory organs 

 of, 577 

 Cystignathus, oviposition of, 100 



Dactylethra, branchial chamber of, 112 ; 



branchiae of, 112; tadpole of, 115 

 Decidua reflexa, of Eat, 200; of Insecti- 



vora, 202 ; of Man, 203 

 Deiter's cells, 433 

 Dental papilla, 641 

 Dental capsule, 641 

 Dentary bone, 488 

 Dentine, 641 



Descemet's membrane, 408 

 Diaphragm, 518; muscle of, 557 

 Dipnoi, nares of, 440 ; vertebral column 



of, 452 ; membrane bones of skull of, 



487 ; heart of, 525 ; arterial system of, 



530; excretory system of, 582; stomo- 



daeum of, 639 

 Diptera, eye of, 395 

 Discophora, excretory organs of, 567 

 Dog, placenta of, 206 

 Dohrn, on relations of Cyclostomata, 69; 



on ancestor of Chordata, 258, 264 

 Doliolum, development of, 23 

 Ductus arteriosus, 533 

 Ductus Botalli, 532 

 Ductus Cuvieri, 537 

 Ductus venosus Arantii, 547 

 Dugoug, heart of, 528 

 Dysticns, eye of, 395 



Ear, see ' Auditory organ ' 



Echinodermata, secondary symmetry of 

 larva of, 313; excretory organs of, 568; 

 generative ducts of, 619 



Echinorhinus, lateral line of, 444; verte- 

 bral column of, 452 



Echiurus, excretory organs of, 566 



Ectostosis, 448 



Edentata, placenta of, 205, 207, 213 



Eel, generative ducts of, 580 



Egg-shell of Elasniobranchii, 33; Chick, 

 121 



Elasniobrauchii, development of, 33 ; vi- 

 viparous, 33; general features of de- 

 velopment of, 45 ; gastrula of, 233 ; de- 

 velopment of mesoblast of, 244; noto- 

 chord of, 244 ; meaning of formation of 

 mesoblast of, 245 ; restiforrn tracts of, 

 350; optic lobes of, 352; cerebellum of, 

 350; pineal gland of, 356; pituitary 

 body of, 359; cerebrum of, 361; olfac- 

 tory lobes of, 366 ; spinal nerves, 369 ; 

 cranial nerves of, 376; sympathetic 

 nervous system of, 384; nares of, 439; 

 lateral line of, 444 ; vertebral column of, 

 453 ; ribs of, 462 ; parachordals of, 467 ; 

 manclibular and hy oid arches of, 474; pec- 

 toral girdle of, 493; pelvic girdle of, 



498; limbs of, 500; pericardial cavity 

 of, 515; arterial system of, 530 ; venous 

 system of, 535; muscle-plates of, 551; 

 excretory organs of, 569; constitution 

 of excretory organs in adult of, 575 ; 

 spermatozoa of, 615 ; swimming-bladder 

 of, 628 ; intestines of, 631 ; liver of, 632 ; 

 postanal gut of, 634 



Eheoblast of Pyrosoina, 23; Salpa, 25 



Elephant, placenta of, 207 



Ernbolic formation of gastrula, 276 



Enamel organ, 641 



Endolymph of ear, 430 



Euclostosis, 448 



Eudostyle of Ascidia, 15, 624 ; Pyrosoma, 

 21 ; Salpa, 27 



Epiblast, of Elasmobranchii, 38; Teleostei, 

 57, 60 ; Petromyzon, 71 ; Lepidosteus, 

 92 ; Amphibia, 101, 103 ; Chick, 124, 

 138 ; Lacerta, 168 ; Babbit, 179, 181 ; 

 origin of in Eabbit, 184 ; comparative 

 account of development of, 249 



Epibolic formation of gastrula, 277 



Epichordal formation of vertebral column, 

 458 



Epierium glutinosum, 118 



Epidermis, in Ccelenterata, 325; protective 

 structures of, 325 



Epididymis, 597 



Epigastric vein, 537 



Episkeletal muscles, 557 



Episternum, 494 



Epoophoron, 597 



Ethmoid bone, 490 



Ethmoid region of skull, 470 



Ethinopalatine ligament of Elasmo- 

 branchs, 475 



Euphausia, eye of, 398 



Eustachian tube, of Amphibia, 111 ; Chick, 

 149 ; Itabbit, 192 ; general development 

 of, 435 



Excretory organs, general constitution of, 

 561 ; of Platyelmiiithes, 561 ; of Mol- 

 lusca, 562 ; of Polyzoa, 563 ; of Brachi- 

 opoda, 563 ; of Chastopoda, 563 ; of 

 Gephyrea, 566 ; of Discophora, 567 ; of 

 Arthropoda, 567 ; of Nernatoda, 568 ; of 

 Echiuodermata, 568 ; constitution of in 

 Craniata, 568 ; of Elasmobranchii, 569 ; 

 constitution of in adult Elasmobranch, 

 575 ; of Petromyzon, 577 ; of Myxiue, 

 578 ; of Teleostei, 578 ; of Ganoidei, 580 ; 

 of Dipnoi, 582 ; of Amphibia, 582 ; of 

 Anmiota, 588 ; comparison of Vertebrate 

 and Invertebrate, 607 



Excretory system, of Elasmobranchii, 40; 

 Teleostei, 63; Petromyzon, 78, 81; 

 Acipenser, 91 ; Amphibia, 110 



Exoccipital bone, 489 



Exoskeleton, dermal, 325 327 ; epider- 

 mal, 325328 



External generative organs, 539 



Extra-branchial skeleton, 471 



Eye, of Ascidia, 14 ; Salpa, 26 ; Elasmo- 



