492 



INDEX. 



Arehelminthes, ii. 76 

 Archigastrula, i. 198, 241 

 Archilithic epoch, ii. 9, 19 

 Archipterygiwm, 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 



Arterice omphalo-mes enter icce, i. 395 



umbilicales, i. 400 



— vertebrates, i. 395 



vitelline, 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, ii. 260 



passage, ii. 269 



vesicles, ii. 262 



Auricular processes of heart, ii. 381 



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



Axial cord, i. 301 



rod (notochord), i. 302 



skeleton, ii. 280, 299 



Axis-plate, i. 299 



Axolotl, ii 126 



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. 54 



Balanoglossus, ii. 85 



Bathybius, ii. 49 



Batrachia, ii. 131 



Bats, ii. 169, 187 



Beaked animals, ii, 147, 187 



Bell-crastrula, 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 

 Blastocoeloma, i. 189 

 Blastoderma, i. 189 

 Blastodiscus, i. 227 

 Blastogeny, i. 24 

 Blastophylla, i. 195 

 Bias top hyly, i. 24 

 Blastosphcera, i. 191 

 Blastula, i. 191, 242 

 Blind-intestine, ii. 330, 343 

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



366 



relationship, i. 112 



— vessels, ii. 370 



Bloodless worms, ii. 75 

 Bonnet, i. 40 

 Brain, i. 212, 232 



bladders of, i. 343 j ii. 214 



parts of, ii. 212 



skull of, ii. 292 



Breast-body, ii. 282 



bone, ii. 282 



cavity, i. 261 



vertebraB, ii. 282 



