7 82 



INDEX. 



Atrial pore of Amphioxus, 7; Ascidia, 20; 

 Pyrosoma, 28 ; Salpa, 32 



Auditory capsules, ossifications in, 595, 

 59.6 



Auditory involution of Elasmobranchii, 

 57; Teleostei, 73; Petromyzon, 89, 

 92; Acipenser, 106; Lepidosteus, 114; 

 Amphibia, 127; Chick, 170 



Auditory nerve, development of, 459 



Auditory organs, of Ascidia, 15; of Salpa, 

 31; of Ammocoetes, 98; Ganoidei, 108, 

 114; of Amphibia, 127; of Aves, 170; 

 general development of, 512; of aquatic 

 forms, 512; of land forms, 513; of 

 Ccelenterata, 513; of Mollusca, 515; 

 of Crustacea, 516; of Vertebrata, 517; 

 of Cyclostomata, 89, 92, 518; of Te- 

 leostei, Lepidosteus and Amphibia, 

 518; of Mammalia, 519; accessory 

 structures of, 527; ofTunicata, 528 



Auriculo-ventricular valves, 642 



Autostylic skulls, 579 



Aves, development of, 145; cerebellum 

 of, 426; midbrain of, 427; infundi- 

 bulum of, 431; pineal gland of, 434; 

 pituitary body of, 436; cerebrum of, 

 439 ; olfactory lobes of, 444 ; spinal 

 nerves of, 449 ; cranial nerves of, 455 ; 

 vagus of, 458; glossopharyngeal of, 

 458; vertebral column of, 557; ossifi- 

 cation of vertebral column of, 558; 

 branchial arches of, 572, 573; pectoral 

 girdle of, 603; pelvic girdle of, 608; 

 heart of, 637 ; arterial system of, 647 ; 

 venous system of, 658; muscle-plates 

 of, 670; excretory organs of, 714; me- 

 sonephros of, 715; pronephros of, 718; 

 Miillerian duct of, 718, 720; nature of 

 pronephros of, 721 ; connection of Miil- 

 lerian duct with Wolffian in, 720 ; 

 kidney of, 722; lungs of, 764; liver of, 

 769; postanal gut of, 774 



Axolotl, 142, 143; ovum of, 120; mid- 

 brain of, 427; mandibular arch of, 583 



Basilar membrane, 524 



Basilar plate, 565 



Basipterygium, 612 



Basisphenoid region of skull, 569 



Bilateral symmetry, origin of, 373-376 



Bile duct, 770 



Bladder, Amphibia, 131 ; of Amniota, 726 



Blastodermic vesicle, of Rabbit, first de- 

 velopment of, 217; of 7th day, 222; 

 Guinea-pig, 263; meaning of, 291 



Blastoderm of Pyrosoma, 24; Elasmo- 

 branchii, 41; Chick, 150; Lacerta 202 



Blastopore, of Amphioxus, 2; of Ascidia, 

 II ; Elasmobranchii, 42, 54, 62 ; Petro- 

 myzon, 87; Acipenser, 104 ; Amphibia, 

 125, 130; Chick, 153; Rabbit, 216; 

 true Mammalian, 226; comparative 

 history of closure of, 284, 288; sum- 

 mary of fate of, 340; relation of to 

 primitive anus, 324 



Blood-vessels, development of, 633 



Body cavity, of Ascidia, 2 1 ; Molgula, 2 1 ; 

 Salpa, 31; Elasmobranchii, 47 ; of Te- 

 leostei, 75 ; Petromyzon, 94 ; Chick, 

 169; development of in Chordata, 325; 

 views on origin of, 356 360, 377; of 

 Invertebrata, 623; of Chordata, 624; 

 of head, 676 



Bombinator, branchial chamber of, 136; 

 vertebral column of, 556 



Bonellia, excretory organs of, 687 



Bones, origin of cartilage bones, 542 ; 

 origin of membrane bones, 543; de- 

 velopment of, 543; homologies of mem- 

 brane bones, 542 ; homologies of carti- 

 lage bones, 545 



Brachiopoda, excretory organs of, 683 ; 

 generative ducts of, 749 



Brain, of Ascidia, IT, 15; Elasmobran- 

 chii, 56, 59, 60; Teleostei, 77; Petro- 

 myzon, 89, 92 ; Acipenser, 105 ; Lepid- 

 osteus, 113; early development of in 

 Chick, 170; flexure of in Chick, 175; 

 later development of in Chick, 176; 

 Rabbit, 229, general account of deve- 

 lopment of, 419; flexureof, 420; histo- 

 geny of, 422 



Branchial arches, prseoral, 570; disap- 

 pearance of posterior, 573; dental plates 

 of in Teleostei, 574; relation of to 

 head cavities, 571 ; see ' Visceral arches' 



Branchial chamber of Amphibia, 136 



Branchial clefts, of Amphioxus, 7 ; of 

 Ascidia, 18, 20; Molgula, 23; Salpa, 

 32; of Elasmobranchii, 57, 59 01; 

 Teleostei, 77; Petromyzon, 91, 96; 

 Acipenser, 105; Lepidosteus, 114, 116; 

 Amphibia, 132, 133; Chick, 178; 

 Rabbit, 231; praeoral, 312, 318; of 

 Invertebrata, 326; origin of, 326 



Branchial rays, 574 



Branchial skeleton, development of, 572, 

 592; of Petromyzon, 96, 312, 571; of 

 Ichthyopsida, 572; dental plates of in 

 Teleostei, 574; relation of to head 

 cavities, 572 



Branchiae, external of Elasmobranchii, 6r, 

 62; of Teleostei, 77; Acipenser, 107; 

 Amphibia, 127, 133, 135 



Brood-pouch, of Salpa, 29 ; Teleostei, 68, 

 Amphibia, 12 1 



Brown tubes of Gephyrea, 686 



Bulbus arteriosus, of Pishes, 638 ; Am- 

 phibia, 639 



Bursa Fabricii, 167, 779 



Canalis auricularis, 639 

 Canalis reuniens, 521 

 Capitellidre, excretory organs of, 683 

 Carcharias, placenta of, 66 

 Cardinal vein, 652 

 Carnivora, placenta of, 250 

 Carpus, development of, 620 

 Cartilage bones of skull, 595 ; homologies 

 of, 595 



