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, loS, 

 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; of Tunicata, 528 



Auriculo-ventricular valves, 642 



Autostylic skulls, 579 



Aves, development of, 145; cerebellum 

 of, 426; midbrain of, 427; infuncli- 

 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, 72 1 ; 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 ; ofTe- 

 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; flexure of, 420; histo- 

 geny of, 422 



Branchial arches, prceoral, 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 61; 

 Teleostei, 77; Petromyzon, 91, 96; 

 Acipenser, 105; Lepidosteus, 114, 116; 

 Amphibia, 132, 133; Chick, 178; 

 Rabbit, 231; prseoral, 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, 61, 

 62; of Teleostei, 77; Acipenser, 107; 

 Amphibia, 127, 133, 135 



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

 Amphibia, 121 



Brown tubes of Gephyrea, 686 



liulbus arteriosus, of Fishes, 638; Am- 

 phibia, 639 



Bursa Fabricii, 167, 779 



Canalis auricularis, 639 

 Canalis reuniens, 521 

 Capitellida;, 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 



