INDEX. 



A. 



Abdomen, 19, 141 



development of, 213 

 Abdominal appendages, 143 



development of, 217 

 Abdominal somite, characters of, 1 42 

 ^Etiology, 47 

 AQASSIZ, 308 

 Alimentary canal, 51 



development of, 213, 222 

 Ambulatory legs, 168 

 American Crayfishes, 243, 247 

 Amceba, 285 



Amurland Crayfishes, 304 

 Antenna, 23, 172 



development of, 214, 218 

 Antennule, 23, 173 



development of, 214, 218 

 Anthrapal&mon, 341 

 Anus, 29 



Apodeme, 99, 158, 175 

 Appendage, 24, 143, 161, 173 



abdominal, 143 



cephalic, 170 



thoracic, 164 

 Archenteron, 211 

 Arctogaeal province, 314 

 Areola, 235 



ARISTOTLE, referred to, 4 

 Arteries, 71 



Arteries, development of, 224 



Arthrobranchia, 75 



Arthrophragm, 158 



Arthropoda, 279, 284 



Articulations, 95 



Asiatic Crayfishes, 304 



Astacina, 254 



Agtacoide*, 250, 313 



Astacomorpha, 338 



Attacopsi*, 250, 264 



Astacu*, division into sub-genera, 



290 



Astacii* angulosu*, 302, 310 

 colchicus, 302, 310 

 dauricu*, 304, 310 

 fluvia tili*, 



anatomy, general account 



of, 1731 

 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, 3;, d49 

 habits, 8 



