492 



INDEX. 



Archelminthes, ii. 76 

 Archigastrula, i. 198, 241 

 Archilithic epoch, ii. 9, 19 

 Archipterygium, ii. 301 

 Archizoic periods, ii. 9, 11 

 Area germinativa, i. 292 



opaca, i. 296 



pellucida, i. 296 



Aristotle, i. 27 ; ii. 368 



epigenesis, i. 29 



heart formation, ii. 368 



his history of evolution, 



i. 27 

 Arm, lower, ii. 278, 304 



upper, ii. 278, 304 



Arteriw omphalo-mescntericae, i. 395 



umbilicales, i. 400 



vertebrates, i. 395 



vitellinee, i. 395 



Arteries, i. 393 

 Artery-arches, ii. 377 



stalk, ii. 380 



Arthropoda, ii. 92, 94 

 Articulated animals, ii. 92, 94 

 Articulation in man, i. 346 

 Ascidia, i. 429 ; ii. 90 



blastula of, i. 455 



chorda of, i. 456 



communities of, i. 455 



gastrula of, i. 455 



gill-sac of, i. 431 

 heart of, i. 433 



homologies of, i. 465, 466 

 intestine of, i. 432 



mantle of, i. 430, 461 



medullary tube of, i. 458 



sexual organs of, i. 434 



tail of, i. 456 



Ascula, ii. 68 

 Atrium, ii. 374, 381 

 Auditory nerve, ii. 262 



organ, !i. 2GO 



passage, ii. 269 



vesicles, ii. 282 



Auricular processes of heart, ii. 381 

 Axes of the body, i. 255 ; ii. 77 

 Axial cord, i. 301 



rod (notochord), i. 302 



skeleton, ii. 280, 299 



Axis.plate, i. 2U9 

 Axolotl, ii. 126 



B 



BAER, KARL ERNST, i. 50 



his germ-layer theory, i. 51 



his law, i. 58 



life of, i. 52 



on the bladder-like outline, 



ii. 62 



on the human egg, i. 55 ; ii. 



424 



on the notochord, i. 55 



on type theory, i. 64 



Balanoglossus, ii. 85 



Bathybius, ii. 49 



Batrachia, ii. 131 



Bats, ii. 169, 187 



Beaked animals, ii, 147, 187 



Bell-gastrula, i. 198 



Bilateral outline, i. 257 ; ii. 74 



Bimana, ii. 169 



Biogeny, i. 24 ; ii. 434 



fundamental law of, i. 6, 



24 ; ii. 434 

 Birds, ii. 120, 138 



gastrula of, i. 223 



Bischoff, Wilhelm, i. 59 

 Bladder-gastrula, i. 229, 241 

 Blastcea, ii. 61 

 Blastocceloma, i. 189 

 Blastodcrma, i. 189 

 Blastodiscus, i. 227 

 Blastogeny, i. 24 

 Blastophylla, i. 195 

 Blastophyly, i. 24 

 Blastosphcera, i. 191 

 Blastula, i. 191, 242 

 Blind-intestine, ii. 330, 343 

 Blood-cells (corpuscles), i. 159; ii 

 366 



relationship, i. 112 



vessels, ii. 370 



Bloodless worms, ii. 75 

 Bonnet, i. 40 

 Brain, i. 212, 232 



bladders of, i. 343 } ii. 214 



parts of, ii. 212 



skull of, ii. 292 



Breast-body, ii. 282 



bone, ii. 282 



cavity, i. 261 



vertebrae, ii. 282 



