INDEX 



973 



Salamandra atra, egg transport in, 202 



sperm transport in female, 191 

 Salamandra salamandra, sperm transport 



in female, 191 

 Salienta, xviii 

 Salmo fario, brain of, 813 



early development of, 323 

 Salmo irideus, presumptive organ-forming 



areas of blastoderm of, 369 

 Salmo salar, xvii 

 Salvelinus (trout) beginning gastrula of, 



437 

 characteristics of egg, site of fertilization, 



and place of sperm entrance into 



egg, 204t 

 Salvelinus fontinalis, xvii 

 Santorini, duct of, of pancreas, 629, 630 

 Sarcolemma, of muscle cell, 700 

 Sarcoplasm, of muscle cell, 700 

 Sayles, L. P., 563 

 Scales, development of, in shark skin, 562 



formation of, in Lepisosteus 



(Lepidosteus) osseus, 564 

 in reptiles, 570 

 Scalopiis aquatic us (mole), characteristics 



of egg, site of fertilization, and 



place of sperm entrance into egg, 



206t 

 teeth of, 615 

 Scammon, R. E., 760, 773 

 Scape, of feather, 571 

 Scaphiopus holbrookii, xviii 

 Scaphirhynchus platorlTychus, xvii 

 Scapula, 693 

 Schleiden, 281 

 Schrader, F., 126, 233 

 Schiickling, A., 223 

 Schwann, 281 



sheath of, 819 

 Schwenk, E., 27 

 Sclera, of eye, 849 



Scleroblasts, in developing scale of Lepi- 

 sosteus, 563 

 Sclerotic coat, 846, 849 

 Sclerotome, 526, 711 

 Scolecomorphus uluguruensis, xviii 

 Scrimshaw, N. S., 197, 915 

 Scrotal ligament, 803 

 Scrotum, 6 



as regulator of testicular temperature, 36- 



37 

 median septum of, 12 

 structure of, 7, 12 

 Scylliuni canicula, dogfish, basic plan of 



head, 528 

 blastoderm of, 318 

 egg capsule of, 929 



Scy Ilium canicula — (Continued) 



surface views of developing blastoderms 



of, 442 

 vitelline membranes of, 163 

 Sea bass, early development of, 323 

 Sea urchin, egg of, developmental potencies 

 (cell lineage) of isolated blasto- 

 meres of, 329 

 nuclear equality in, 335 

 presence of fertilizin in egg of, 227 

 Sebaceous glands, 587 

 Secondary hypoblast, formation of in tele- 



ost fish blastoderm, 370 

 Secondary primordial germ cells, 117 

 Secretin, 875 

 Seessel's pocket. 599 

 Segmental (pronephric) duct, origin of, 



775 

 Segregation of different substances, one of 



functions of cleavage, 333 

 Self-differentiation, definition of, 375 

 Semen, 15, 21 



coagulation of, 33 

 function of, 32 

 sperm density in, 32t 

 Semicircular canals, 851, 854 

 Semilunar (gasserian) ganglion, 828 

 Semilunar valves, in aortic and pulmonary 

 trunks, 759 

 of chick heart, 756 

 Seminal fluid, 21 

 amount of, 32 

 factors involved in passage of from testis 



to main reproductive duct, 179 

 factors which propel, 182 

 functions of, 32 

 Seminal plasma, influences of in effecting 



sperm contact with egg, 231 

 Seminal vesicles, 802 

 function of, 31 

 in certain birds, 186 

 in ovenbird, 186 

 in robin, 186 

 in towhee, 186 

 in wood thrush, 186 

 of caudal end of reproductive duct, in 



elasmobranch fishes, 186 

 possible elaboration of fructose in, 34 

 Seminiferous tubules, primitive, 792 

 Semispinalis muscle, of human embryo, 715 

 Senescence, period of, xiv 

 Sense placodes, 812 



special, 812 

 Sense (receptor) organs, 841 

 somatic, general, 842 



special, 842 

 visceral, general, 842 

 special, 842 



