GENERAL INDEX 
[The numbers in dark type refer to illustrations] 
AcILtIus larva, eye of, 78, 88 
Acromegaly, 425 
Actinotrocha, 488 
Addison’s disease, 423 
Adelopthalmus, 249 
Adrenalin, 423, 491 
Adrenals, 423, 491 
Agnathostomatous fishes, 29, 343 
Alimentary canal, 433 
5 »  Ammocecetes, 168, 405, 445 
a3 » invertebrate, compared to tube of central nervous system of verte- 
brate, 43, 433 
” » innervation of, 447 
origin of, 444 
ss » position of vertebrate and invertebrate, 10 
5 » possibility of formation of new, 58 
4s », relationship between notochord and, 434 
Ammoceetes, 82, 245 
35 an ancestral type, 35, 309 
3 alimentary canal, 168, 405, 445 
5 auditory organ, 378, 379 
5 brain, 39, 40, 44, 45, 46, 48, 54, 61 
. branchial appendages, 161, 162, 163, 164 
z a basket-work, 126, 128, 296, 331, 335 
i es chamber, 161, 168, 162, 163 
is ms circulation in Limulus and, 174 
5 es diaphragms, 161, 167 
re 3 lamelle, 175 
muscles, 171 
on A nerves, 164 
+) - segments, 178, 312 
cartilage, hard, 183, 183, 298, 294, 377 
muco, 130, 131, 291, 293, 294, 296, 330, 331, 333, 334, 
835, 338 
5 “ soft, 129, 180, 298, 294, 296, 335 
degeneracy, evidence of, 59, 94, 343 
development, 228, 458 
digestion, 58, 442 
epithelial cells of gills, 214 
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