366 
Crayfishes, Figian, 306, 313 
Japanese, 304, 313 
Mascarene, 308, 313 
northern and southern, com- 
pared, 252 
Novozelanian, 306, 313 
southern, 249 
Tasmanian, 306 
Western North American, 305, 
313 
Crustacea, 271, 278 
Crystalline cones, 121 
Cuticle, 33, 50, 175, 192 
Cyclae, 356 
D. 
Dactylopodite, 165 
Daphnia, asexual reproduction of 
128 
Darwin, C., referred to, 4 
DE HAAN, quoted, 313 
Development, 205 
abdomen, 213 
abdominal appendages, 217 
alimentary canal, 213, 222 
antennze, 214, 218 
antennules, 214, 218 
blood and blood vessels, 224 
branchiostegite, 217 
carapace, 214 
cephalic appendages, 217, 219 
connective tissue, 224 
ear, 225 
eye, 225 
eyestalk, 214, 218 
gills, 224 
heart, 224 
kidney, 224 
labrum, 218 
mandibles, 214 
INDEX. 
Development of muscles, 224 
nervous system, 213, 224 
reproductive organs, 225 
rostrum, 217 
thoracic appendages, 217, 219 
Digestion, 63 
Distribution, 46 
chronological, of crayfishes, 44, 
316, 339 
table of, 345 
geographical, of crayfishes, 44, 
288 
causes of, 335 
resuits of study of, 308, 314 
DoRMER, quoted, 356 
DULK, quoted, 349 
E. 
Ear, 116 
development of, 225 
Ecdysis, 32, 350 
Ecrevisse & pieds blancs, 289, 297 
a pieds rouges, 289, 297 
Ectoderm, 141 
Ectostracum, 194 
Edelkrebs, 290 
Endoderm, 141 
Endophragmal system, 167 
Endopleurite, 158 
Endopodite, 145 
Endoskeleton, 17 
Endosternite, 158 
Endostracum, 194 
Engeus, 250, 306 
Enoplocytia, 342 
Epiblast, 211 
Epidermis, 140 
Epimeron, 143 
Epiostracum, 192 
Epipodite, 167 
