INDEX. 



A. 



Abdomen, 19, 141 



development of, 213 

 Abdominal appendages, 143 



development of, 217 

 Abdominal somite, characters of, 1 42 

 Etiology, 47 

 Agassiz, 308 

 Alimentary canal, 51 



development of, 213, 222 

 Ambulatory legs, 168 

 American Crayfishes, 243, 247 

 Amoeba, 285 



Amurland Crayfishes. 304 

 Antenna, 23, 172 



development of, 214, 218 

 Antennule, 23, 173 



developm3nt of, 214, 218 

 Anthi'ajJalcemon, 341 

 Anus, 29 



Apodeme, 99, 158, 175 

 Appendage, 24, 143, 161, 173 



abdominal, 143 



cephalic, 170 



thoracic, 164 

 Archenteron, 211 

 Arctogseal province, 314 

 Areola, 235 



Aristotle, referred to, 4 

 Arteries, 71 



Arteries, development of, 224 



Arthrobranchia, 75 



Arthrophragm, 158 



Arthroj)oda, 279, 284 



Articulations, 95 



Asiatic Crayfishes, 304 



Astacina, 254 



Astacoides, 250, 313 



Astacomorpha, 338 



Astacopsis, 250, 264 



Astacus, division into sub-genera, 



290 

 Astacns angiilosiis, 302, 310 

 colchicus, 302, 310 

 dauricns, 304, 310 

 Jiuvmtil'is, 



anatomy, general account 



of, 17—31 

 attachment of young to 



mother, 40, 351 

 branchial formula, 266 

 development, 205- -226 

 distribution, geographical 



44, 288, 298 

 distribution, chronologi- 

 cal, 44 

 ecdysis, 32, 350 

 general characters, 6 

 growth, 31, 349 

 habits, 8 



