584 EMBEYOLOGY OF THE LOWER VEETEBEATES 



Archipalliuui, 91 

 Arcualia, 292 

 Arterial system, 393 

 Auditory organ, 129, 130 



skeleton, 343 

 Axial mesoderm, 63 

 Axon, 84 



Balancers, 156, 157 

 Basilar plate, 310 

 Bdellostoma — 



egg-envelope, 456 



segmentation, 18 



tongue, 151 

 Bilateral segmentation, 9 

 Birds. See also under Fowl 



allantois, 471 



amnion, 469 



auditory organ, 129, 130 



blood and vessels, 368 



bursa fabricii, 192 



carotid arteries, 404 



choudrocranium, 314, 316 



embryo with amnion, etc., 472, 473 



endoderm, 51 



flight, origin, 453 



heart, 367, 383, 384, 385 



liver, 188 



lung, 162, 163, 165 



mesoderm, origin, 64 



mesonephros, 253, 254 



metanephros, 256 



neonychia, 74 



neural crest, 122 



neurenteric canal, 53 



otocyst, 129, 130 



pancreas, 191 



pecten, 140, 552 



pelvis, 356 



pleural cavity, 202 



practical study, 508-557 



primitive streak, 53, 519, 520 



pronephros, 237 



ureter, 257 



venous system, 425 

 Blastocoele, 7 

 Blastoderm, 7 



name, 505 

 Blastomere, 5 

 Blastopore, 31, 496 

 Blastula, 7 

 Blood, 365 



islands, 368 



vessels, 368 

 Bomhinator — 



external gills, 156 



lung, 169 



pancreas, 191 



with grafted limb, 115 

 Bone, 321, 332 



evolution, 333 

 Bones — 



dental, 332, 334 



investment, 335 



Bones {continued) — 



substitution, 335 

 Brain, 85 



anterior end of, 90 



sagittal sections, 88, 93, 146, 147, 149 

 Branchial — 



arch, skeleton, 318 



buds, 177 

 Buccal cavity, 145 



glands, 152 



solid rudiment, 148, 149 

 Biifo— 



cement-organs, 79 

 Bursa fabricii, 192 



Calcareous bodies of Frog, 132 

 Callorhynchus — 



arcualia, 297 



scales, 323 



teeth, 330 

 Carotid arteries, 403 

 Cartilage, 292 

 Cell-continuity, 37, 486 

 Cement-organs of Lung- fish and Amphibians, 

 78, 79, 80, 181 



of Teleostomi, 178 

 Cephalization, 54 

 Ceratodus — 



egg, 25 



external form, 436 



limb-skeleton, 350 



lung or air-bladder, 169, 172 



nares, 125 



pancreas, 191 



pronephros, 231' 



segmentation, 25, 26 



teeth, 324, 330, 331 



thymus, 177 

 Cerebellum, 89 

 Cerebral flexure, 92 

 Cerebrum, 85 

 Chalaza, 515 

 Chalcides — 



placenta, 481 

 Chameleon — 



air-sacs, 162 



tooth-succession, 328 

 Cheiropterygium, 356, 357 

 Ghelonia ( = Chelone) — 



amnion, 466, 467, 468 



gastrular lip, 49 



neurenteric canal, 52 ; 



Chelydra, amnion, 466 

 Chiasma, optic, 87 

 Chondrocranium, 306, 317 

 Choroid, 139 



fissure, 135 

 Chromatophores, 80, 82 

 Chromophile organs, 283 

 Ciliation of ectoderm, 70 

 Claw, 74 



pad, 74, 75 

 Clefts, visceral (pharyngeal, branchial, 

 gill), 158 



