INDEX 



369 



artificial parthenogenesis, 207; nu- 

 merical constancy, 66; varia- 

 tion, 66-67; pairing, 68-69, 68; 

 plurivalent, 67; relation to sex, 

 306, ff.; specific constancy, 65; 

 specificity, 70; structure, 291- 

 292, 291 ; univalent, 67 



cicatrix, 120 



Ciliates, mutual fertilization, 194, 

 196 



Cirripedia, complemental males, 106 



Cladonema, germ cells, 110 



Clai'a, blastula, 220 



cleavage, 18, 219, ff.; adequal, 227; 

 bilateral, 235-237; complete, 226, 

 232; determinate, 244; deviations 

 from "laws" of, 231, ff.; dexio- 

 tropic, 235; discoid, 227, 240; 

 disymmetrical, 238; equal, 226; 

 forms, 226, ff.; holoblastic, 227; 

 incomplete, 226, 239; indetermi- 

 nate, 244; irregular, 239; laeo- 

 tropic, 235; "laws" of, 229, ff.; 

 meroblastic, 227; nomenclature of 

 blastomeres, 248, ff., 270; partial, 

 227; plane, first, location of, 246, 



ff.; meridional, vertical, etc., 



228-229; relation to position 



of centrosome, 230, 56 ; 

 to symmetry of ovum and adult, 

 246; processes of, 244, ff.; radial, 

 228, 232; rate, 230; rhythms, 232; 

 rotatorial, 232; spiral, 232, 234; 

 superficial, 227, 241-243; termina- 

 tion of period of, 221; under pres- 

 sure, 281-282, 284; unequal, 227 



Clepsine, cleavage (radial), 235 



Clytia, development of isolated 

 blastomeres, 280 



coalescence, development after, 282 

 283 



Coccidium, reproduction, 200; schizo- 

 gony, 4 



cod fish, number of ova, 107 



coeloblastula, 220, 330, 331 



ccelom, 336 



coenobium, 8 



coenogenetic traits, 27 



Collozoum, gametes, 198 



complemental males, 106 



concrescence, 347, 351, ff., 352 



confluence, 347, 347, 351, 362, 353, 

 354 



conjugation, epidemics of, 209; re- 

 lation to reproduction, 208, ff.; 

 see also fertilization. 



Conklin, 206, 220, 258, 267, 269, 

 271, 275, 278, 298, 305 



connecting fibers, 53 



contraction phase, 135 



Copepod, chromosome groups dur- 

 ing cleavage, 223, 225 



Copromonas, conjugation, 192, 193 



copulation, 106 



cortical layer, 90 



Crampton, 271 



Crepidula, blastomeres, 256 ; differ- 

 entiation of cilia, 298; synthesis 

 of nuclein, 206 



Cristatella, statoblasts, 8 



Crustacea, spermatozoa, 99, 108 



Ctenophore, cleavage (disymmetri- 

 cal), 238, 238 



Cumingia, development after cen- 

 trifuging, 277, 277 



cyclopia, in Fundulus (artificial), 

 318, 319 



Cyclops, blastula showing primitive 

 germ cells, 112; segregation of 

 germ, 133 



Cydosporia, gametes, 198 



Cynthia, development of single blas- 

 tomeres, etc., 269, 270, 272; non- 

 correspondence of cell boundaries 

 and formative stuffs, 278; or- 

 ganization of ovum, 267; structure 

 of ovum preceding and following 

 fertilization, 176, 177, 178; test- 

 cell nuclei in ovum, 120 



Cypris, parthenogenesis, 203; sper- 

 matozoon, 100 



cytoplasm, 37; localization in, 264, 

 ff.; of ovum, differentiation in, 

 90, ff. 



cytotropy, 189 



Dallingeria, anisogamy, 198 



Daphnia, spermatozoon, 108 



Dean, 109 



Delage, 207 



delamination, 340, 362 



Delia Valle, 67 



Dentalium, development of isolated 



blastomeres, 271, 273: yolk lobe 



(polar lobe), 271 

 determinate cleavage, relation to 



indeterminate, 284, ff. 

 "determiners," in differentiation, 



290, 297; possible nature of, 298 

 duteoplasm, 40 

 development and differentiation, as 



interaction, 320-321; as reaction 



(behavior), 24-25, 261-262; phases 



of, 18-19 



dicentric system, 79 

 Didelphys, spermatozoon, 99 

 didermic organism, 332-333 

 Diemyctylus, spermatophore, 105 

 differentiation, conditions of, 262, 



ff.; cytoplasm and nucleus in, 305; 



