INDEX. 
A. 
Abdomen, 19, 141 
development of, 213 
Abdominal appendages, 143 
development of, 217 
Abdominal somite, characters of, 142 
Atiology, 47 
AGASSIZ, 308 
Alimentary canal, 51 
development of, 213, 222 
Ambulatory legs, 168 
American Crayfishes, 243, 247 
Ameba, 285 
Amurland Crayfishes, 304 
Antenna, 23, 172 
development of, 214, 218 
Antennule, 23, 173 
development of, 214, 218 
Anthrapalemon, 341 
Anus, 29 
Apodeme, 99, 158, 175 
Appendage, 24, 143, 161, 173 
abdominal, 143 
cephalic, 170 
thoracic, 164 
Archenteron, 211 
Arctogezal 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 
Astacoides, 250, 313 
Astacomorpha, 338 
Astacopsis, 250, 264 
Astacus, division into sub-genera, 
290 ; 
Astacus angulosus, 302, 310 
colchicus, 302, 310 
dauricus, 304, 310 
SJluviatilis, 
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 
