INDEX 



937 



Blastocoelic cavity, primary, of chick blas- 

 toderm, 3 19 

 Blastocoelic fluid, alkalinity of, 297 

 Blastocyst, 300 



early, of rabbit, 303 

 mammalian, types of, 303 

 primary condition of, 305 

 secondary, 305 

 Blastoderm, 280 



avian, origin of hypoblast (entoderm) 



in, 358 

 central, of reptilian blastula, 360 

 of chick, delamination of hypoblast (en- 

 toderm) cells from, 359 

 pre-primitive streak, 35S 

 presumptive organ-forming areas of, 

 360 

 opaque, of reptilian blastula, 360 

 Blastomere(s), definition of, 280 

 equal, 288 

 totipotent, 336 

 Blastoporal canal, 417, 469 

 Blastopore, closure of, 404 

 in Amphioxus, 501 

 in frog embryo, 469 

 comparison with primitive streak, 450 

 definition of, 390 



dorsal lip of, of teleost blastoderm, 438 

 history of in developing embryo of Rana 

 pipiens, 416 

 Blastosphere, definition of, 341 

 Blastula, of Amphibia, 370 

 auxiliary cells of, 341 

 chordate, as a bilaminar structure, 352 

 descriptions of various types, 352 

 relation of to future three germ- 

 layered condition, 352 

 significance of, 340 

 formative cells of, 341 

 importance of in embryonic develop- 

 ment, 351 

 importance of in Henkel's theory of, 347 

 in relation to twinning, 380 

 late, organization center in, 283 



importance of, 386 

 morphological relationships of, 282 

 movements of parts of, during gastrula- 



tion in amphibia, 411 

 of opossum, 366 



organization of, in Amphioxus, "iAl 

 physiological relationships of, 282 

 primary, of chick egg, 319 



of Echidna, 363 

 protochordate, 352 

 relationship of to gastrula and primitive 



body form, 393t 

 reptilian, 360 



Blastula — {Continued) 



secondary, formation of in Echidna, 363 

 solid, 312 

 Blastulation, a main purpose of, 351 

 Blood, composition of, 726 



relation of to connective tissues, 654 

 Blood capillaries, subintestinal, 726 

 Blood-cell formation, sites of, 733 



in human embryo, 735 

 Blood-cell origin, theories of, 732 

 Blood cells, developing, 734 

 early embryonic origin of, 733 

 white, 726 



characteristics of. 735 

 Blood corpuscles, red, 726 



{see also Erythrocytes) 

 white, 726 

 Blood islands, of yolk sac, 733 

 Blood platelets, 726 

 Blood sinus, circumferential, of chick 



embryo, 743 

 Blood vessel(s), later development of, 731 

 primitive, formation of, 727 

 supraintestinal, 727 



theories of primitive development of, 730 

 Bloom. W., 582, 733 

 Blount, M., 320 

 Body fold(s), lateral, 869 

 anterior, 869 

 posterior, 869 

 Body form, definition of. 518 

 definitive, definition of, 519 



possible influence of endocrine secre- 

 tions on development of, 883 

 development of, 462 



in vertebrate group, basic similarity of, 

 514 

 larval, definition of, 518 

 organization of, influences which play a 



part in, 512 

 primitive embryonic, xiv 

 definition of, 518 



relationship of to blastula and gas- 

 trula, 393 

 types of, during embryonic development, 

 531 

 Body plan, primitive, in relation to gas- 



trulation, 391 

 Body ridges, lateral, 869 

 Body stalk, 914 

 Bomhinator embryo, organ-forming areas 



of blastula in. 474 

 Bone(s). 656 



cancellous, 660 {see also Bone, spongy) 

 conversion of into compact bone, 668 

 characteristics of, 659 

 compact, 660 



conversion of cancellous bone to, 668 



