INDEX 



977 



Squalus acanthias — (Continued) 

 gill septum in, 638 

 initial division of coelom of, 861 

 kidney of, 773 

 lateral-line canal of, 843 

 liver rudiment of, 623, 625 

 morphogenesis of digestive structures of, 



599 

 ovoviviparity and viviparity in, 914 

 pectoral girdle of, 689 

 pelvic girdle of, 689 

 pericardioperitoneal opening of, 864 

 pronephric kidney in, 775 

 skin, development of, 562 

 sperm survival within female genital 



tract of, 197 

 tail musculature of, 704, 706 

 testis in relation to reproductive ducts, 19 

 venous system development in, 738 

 Squamous inferior, center of ossification, 



695 

 Squamous superior, center of ossification, 



695 

 Stapes, 674, 851 



Starling, European, Sturnus vulgaris, effect 

 of added electric lighting upon 

 reproductive activities, 44, 45 

 Stearns, M. L., 664 

 Stem villus, 914 

 Steno, 5 



Stereoblastula, 312, 341 

 Stereocilia, of epithelial cells. 180 

 Sterna hirundo, tern, feather rudiment of, 



577 

 Sternebrae, 687 



Sternocleidomastoid musculature, 718 

 Sternohyoid muscle, innervation of, 717 

 Sternum, 688 



Stickleback, Gasterosteus aculeatus, repro- 

 ductive activity and temperature 

 in, 26, 46 

 interstitial tissue, 25 

 Stimulus, 807 



Stockard, C. R., 384, 731, 733 

 Stomach, development of, 618, 623 

 regions of, 62 1 

 true, definition of, 621 

 Stomach sweetbread, 880 

 Stomodaeal invagination, 484-485, 603 

 Stomodaeum, 482. 598, 601 

 Stratum corneum, of epidermis. 568, 579 

 Stratum germinativum. 558. 559, 568, 579 

 Streeter. G. L., 305, 434, 923 

 Strichnine, activation of egg by, 218 

 Strong. R. M.. 577 

 Strongylocentrotus purpuratus, fertilizer of. 



225 

 Struthio, xix 



Styela, chorion in egg of. 162. 163 

 early cleavage planes in. 286 

 egg of. bilateral symmetry of, 162 

 organ-forming areas in egg of, 161 

 "test" cells of egg of, 164 

 Styela partita, xv 

 cell lineage in. 344 



characteristics of egg. site of fertilization, 

 and place of sperm entrance into 

 egg, 203t 

 development of half embryos in isolated 



blastomeres of, 332 

 differences in early blastomeres in, 328 

 fertilization in, 224, 245 

 movements of ooplasmic substances in 

 egg of at fertilization, 264 

 Subarachnoid space, 821 

 Subcardinal veins, 737 

 Subdural cavity, 822 

 Subhyoideus muscle, 717 

 Subnotochordal rod, 655 

 Substances, spawning-inducing, 228 

 Subunguis, 584 

 Subvertebral ganglia, of autonomic nervous 



system, 837 

 Sudoriferous glands, 587 

 Supporting tissue, of nervous system, 809 

 Supracardinal veins, of mammalian em- 

 bryo, 747 

 Suprarenal body, differentiation of. 882, 883 

 Suprascapula, 693 



Sus scrofa (pig), characteristics of egg. 

 site of fertilization, and place of 

 sperm entrance into egg, 207t 

 Suspensory structures, primitive, formation 



of, 859 

 Sustentacular elements, 793 

 Suture, of frontal bony areas of skull, 695 

 Swain, E. R., 796 

 Swammerdam, 56, 281 

 Sweetbread, stomach, 880 



throat, 880 

 Swift, C. H.. 790, 794 

 Swim-bladder, relationships of. 643 

 Swingle, W. W., 773 

 Sylvius, aqueduct of, of brain, 823 

 Sympathetic chain ganglia, of autonomic 



nervous system, 837 

 Sympathetic division, of autonomic nerv- 

 ous system, 836 

 Sympathetic ganglia, 836 

 Synapsis, 132 

 Synaptene stage, 135 

 Synarthrosis, 695. 696 

 Syncytium, 360, 703 

 Synergism. 41 

 Syngamy. 113, 211 



