GENERAL INDEX 531 
Organs, auditory, of arachnids and Insects, 368 
», branchial, innervation of vertebrate, 151 
a Ph sense-organs of embryo vertebrate, 261, 281 
»,  Chordotonal, of insects, 864, 369, 370 
» electric, 470 
» generative, of Limulus, 208, 209 
35 3 connection between Thyroid gland and, 215 
» genital, of sea-scorpions, 206 
» lateral line, 355, 411 
»  lyriform, of.arachnids, 364, 369 
» Olfactory, of Scorpion group, 220 
» phagocytic, 420 
» racquet, of Galeodes, 369, 375 
5 segmental excretory, 389, 391, 408, 418, 459, 477 
» sense, of appendages of Limulus, 358 
» vestigial, 456 
» Of vision, evidence of, 68 
vital, 57 
Origin of alimentary canal, 444 
i arthropods from annelids, 395 
‘5 atrial cavity, 409 
Ps auditory capsules and parachordals, 377 
45 colom, 475, 481 
a3 ductless glands, 428 
is free cells, 472 
4 heart of vertebrate, 179 
i lateral line organs, 356 
5 muscles, 478 
fe musculature, branchial, 170 
ss 5 somatic trunk, 406 
ra nervous system, central, 480 
a notochord, 434 
re segmental excretory organs, 389 
gs skeleton of vertebrates, 119 
vertebrates, 9, 36, 351, 433, 493 
Oatracndermata, 326, 343 
Osteostraci, 29, 75, 275, 326, 343 
Otoliths, 378 
Ovum, 473 
Pactntan bodies, 470, 477 
Palemon, 20, 422 
Palzontology, evidence of, 20, 497 
Palezostoma, 317 
Paleostraca, 27, 396 
3 median eyes, 74 
i mesosomatic appendages, 188 
sn olfactory organs, 221 
segments, compared to Ammoceetes, 308 
Pantopodé, glands, 423 
Parachordals, 121, 132, 377 
Parapodia, 357 
