346 



INDEX OF SUBJECTS 



Spermatogenesis, 42, 256 ff. 

 Spermatogonia, 127. 

 Spermatozoon, 19-22, 48. 

 Spherule, 276. 

 Spireme, 14, 15. 

 Spongilla, 73. 

 Spongioplasm, 4, 5. 

 Sporulation, 17. 

 Squash bug, 256. 

 Starfish, 6. 

 Statoblast, 18. 

 Statocyte, 70, 71, 73. 

 Stem-cell, 175. 



Stone-fly, hermaphroditic, 194. 

 Synapsis, 44, 122, 250 /., 305. 

 Synaptene, 251, 252. 

 Synizesis, 43, 237, 251, 252. 



Tcenia, 136, 137. 

 Telophase, 15, 16. 

 Telosynapsis, 254. 

 Testis, 41. 

 Tethya, 70, 76, 79. 



Tetrad, 44, 45. 



Tipulides, 107. 



Toad, hermaphroditic, 207-208. 



Tokocyte, 71, 73, 79. 



Trophochromatin, 28. 



Unit character, 304. 

 Uterine spindle, 157. 



Vacuole, 5, 8. 

 Vegetative pole, 20. 

 Vertebrate, 32, 95-105, 212. 

 Vitelline membrane, 113, 114. 

 Vitellophag, 114. 



X-chromosome, 255 ff., 264, 299. 



Y-chromosome, 259 ff., 264. 

 Yolk, in germ cells, 101, 224. 

 Yolk nucleus, 19, 226, 285. 



Zygosome, 251. 

 Zygote, 1, 48. 



