Origin of crayfish, evidence as to, 320, 331
Procephalic lobes, 160 development of, 213
Reproduction of lost limbs, 38 sexual, 39, 128, 135, 350
Reproductive organs, 128 development of, 225
_Salmonidæ_, parallel between their distribution, and that of _Astacidæ_, 315
Somite, 143, 161, 355 abdominal, 142 cephalic, 154 thoracic, 150
Species, 243, 290 morphological, 291 physiological, 296
Thoracic appendages, 164 development of, 217 somites, 150
Young of _Astacus_, newly hatched, characters of, 219
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