374 



INDEX 



paraplasm, 35, 40 



parasynapsis, 136 



parthenogenesis, 17, 203; "artificial 

 204, ff. 



parthenogonidia, 10 



Pasteur, 1 



Patella, development of isolated 

 blastomeres, 274 



paternal resemblances in hybrids, 

 affected by external conditions, 

 304, ff. 



paths, of pronuclei, in fertilization, 

 185, 186 



Patterson, 348 



Paulmier, 307, 310 



Payne, 311, 313 



Pelagia, chromatin extrusion in 

 oocyte, 299 



perforatorium, of spermatozoon, 98 



periblast, 346 



Peripatus, spermatophore, 105 



perivitelline space, 176 



Petromyzon, blastula, 220, 231; 

 ovum and spermatozoon, 87 



Pfeffer, 167 



Pfliiger, 263 



Phyllopneuste, spermatozoon, 99 



pigeon, gastrulation, 349 



plane, of cell division, 55, 56 



Planocera, cell lineage, 248, ff., 252- 

 253; cleavage, 248, ff., 250, 251 



plasmosomes, 38 



plastids, 39 



plastogamy, 189, 190 



Plateau's law, 231 



Platner, 114, 150 



Pleodorina, reproduction, 9, 10 



polar bodies, 115, 116, 144, 147; 

 comparison with spermatids, 116, 

 147, 148; " giant," 148, 149; loca- 

 tion, 149, 150; size, 148, 149 



polarity, of cell, 41; of ovum, 91, ff.. 

 266 



polar lobe, of Dentalium, 271 



polar nuclei, 149 



Polygordius, cleavage (radial), 234 



polyoestrous, 103 



polyspermy, 170; physiological, 170 



postgeneration, 284 



postreduction, 152 



potassium, effects upon differentia- 

 tion, 318 



predelineation, 23 



predetermination, 23 ; of germ, 264, ff. 



preformation, 21 



prereduction, 152 



prespermatogonium, 121 



pressure, effects upon cleavage and 

 differentiation, 281-282, 284 



primitive groove, 348 



primitive gut cavity, 334 



primitive streak, 346, 348; of Ser- 

 ranus, 354 



primordial germ cells, 111 



Pristiurus, chromosomes, 69 



promorphology, of germ, 264, ff.; 

 of ovum, 91 



pronuclei, behavior during fertiliza- 

 tion, 180, ff., 186, 187-188 



prophase, 52 



prospective potency, 263 



prospective significance, 263 



protandry, 13 



Proteus, chromatin extrusion in 

 oocyte, 299 



prothallus, chromosome number, 

 161 



protogony, 13 



protoplasm, structure, 34-36, 36 



protoplasmic bridges, 32, 42 



Protozoa, gametes, 198; mitosis, 57, 

 ff.; relation between fertilization 

 (conjugation) and reproduction, 

 208, ff.; reproduction, 2-11 ; senes- 

 cence and rejuvenation, 209, ff. 



Psammechinus, development of 

 fused embryos, 285 



pseudochromosomes, 41 



pseudocopulation, 105 



pseudohybrids, 303 



Pygosteus, micropyle, 96 



Quartets, of blastomeres, 229 



Rabl, 41, 70 



Raja, chromosome groups (auton- 

 omy), 225 



Rana, see frog. 



rat, spermatogenesis, diagram, 122, 

 123 ; spermatozoon, 99 



recapitulation, theory of, 25-27, 26 



Redi, 1 



reducing divisions, 133; in matura- 

 tion, 152, relation to chromioles, 

 153 



reduction, with tetrad formation, in 

 oogenesis and spermatogenesis, 

 139, 146 



regulation, of localization, 284, 286 



rejuvenation, relation to fertiliza- 

 tion (conjugation), 209, ff., 212 



reproduction, relation to fertiliza- 

 tion (conjugation), 202, ff. 



Reptiles, gastrula, 345 



resorption, in morphogenesis, 362 



resting period, 45 



reticulum, protoplasmic, 34, 35 



Rhodeus, ova, 104 



Rhoditis, parthenogenesis, 203 



Rhumbler, 81, 189 



