936 



Aschheim-Zondek test, for pregnancy, 926 

 Asdell, S. A., 19, 103, 197 

 Asmundson, V. S., 905 

 Asterias forbesi, artificial mechanical acti.- 

 vation of, 219 

 fertilization cone in, 243 

 Astylosternits robust us, respiratory villosi- 



ties of, 636 

 Asymmetron macricaudatum, xv 

 Asynchronism, in cleavage of frog's egg, 



295 

 Atrioventricular node, 754, 161 

 Atrioventricular valves, of chick heart, 756 

 Atrium, of developing heart, 747, 750 



fate of in various vertebrates, 758 

 Auditory meatus, external, 851 

 Autonomic nervous system, 823 

 definition of, 834 

 development of, 834 

 divisions of, 836 

 ganglia of, 837 



origin of, 837 

 gray and white rami of, 826 

 origin of, 834 

 Autonomous potency {see Potency, au- 

 tonomous) 

 Autonomous theory of gastrulative move- 

 ments, 447 

 Auxiliary cells, of blastula, 341 

 Auxiliary glands, 4 

 Auxocyte, definition of, 125 

 Aves, xix (see also Bird) 

 Axial filament, formation of, 152 

 Axiation, of specific organ-forming terri- 

 tories, a main function of gastru- 

 lation, 447 

 Axis cylinder, 814 

 Axon, 814 



B 



Baitsell, G. A., 664 

 Baker, J. R., 47 

 Balfour, F. M., 536, 716 

 Barb(s), of feather, 571 



manner of formation of, 576 

 Barbicels, of feather, 573, 576 

 Barbule(s), of feather, 573, 576 



formation of, 576 

 Bartelmez, G. W., 733 

 Bartholin, glands of, 802 

 Basal plate area of primitive skull, 671 

 Basalia, 685 

 Basement membrane, of mature Graafian 



follicle, 71, 74 

 Basidorsals, of arcualia, 682, 685 

 Basihyal element, 673 

 Basioccipital center of ossification, 695 

 Basisphenoid portion of sphenoid bone, 696 



Basiventrals, of arcualia, 682, 685 

 Bat, Myotis, descent of testes in, 7 



sperm production in, 30 



spermatogenesis in, 23 

 Bataillon, E., theory of fertilization of, 268 

 Bataillon, method for producing artificial 



parthenogenesis, 219 

 Bathygobius soporator (gobiid fish), de- 

 velopment of, 250 



egg membrane expansion at fertilization, 

 235 



micropyle in egg of, 249 

 Balrachoseps, red blood cell nuclei of, 735 

 Batson, O. V., 837 

 Beams, H. W., 150 

 Belly stalk, 911 

 Bending, of body of vertebrate embryos, 



511 

 Benoit, J., 120 

 Bhattachorya, 167 

 Bidder's organ, 889 

 Bilateral symmetry, of egg, 161, 162 

 Bile, 875 



Bile duct, common, 627 

 Biogenetic principle of recapitulation, 347 

 Biophor, 334 



Bipotential condition, of early gonad, 792 

 Bird(s), blastoderm of, hypoblast (ento- 

 derm) origin in, 358 



blastula in, mature, 357 



coelomic changes in, 867 



copulatory organ of, 191 



developmental stages of neurocranium 

 in, 673 



egg of, albuminous sac of, 905 



chalaziferous layer, formation of, 905 



egg membranes of, tertiary, 905 



female reproduction of, 192 



follicle and periphery of oocyte of, 156 



lung, position of in body, 649 



oviparity and ovoviviparity in, 914 



pectoral girdle of, 689 



skin, characteristics of, 571 

 development of, 573 



tongue of, copula of, 604 

 Bischoff, 213 

 Bisexual species, 886 

 Bishop, D. W., 27 

 Bissonnette, T. H., 44, 46 

 Bitch, condition of egg at fertilization, 222 

 Bladder, air, development of, 651 



types of, 643 

 Blastaea. definition of, 347 

 Blastaea-gastraea theory, 347 

 Blastocoel, definition of, 280 



development of in frog's egg, 296, 297 



formation of in Rana pipiens, 295 



importance of, 391 



