530 THE ORIGIN OF VERTEBRATES 
Nerves, of prosoma in Limulus, 235, 355 
» regeneration of, 469 
» roots, of Limulus, 157 
» sacral, 448 
» segmental, 152, 156 
6 segmental nature of cranial, 259, 411 
ae spinal, absence of lateral roots in, 388 
» Spinal accessory, 154 ; 
» trigeminal, 151, 155, 156, 234, 243, 257, 279 
* 6 motor nucleus of, 280 
ay i of Ammoccetes, 288 
% tripartite arrangement of cranial nerves, 154, 157, 235, 267, 355 
»,  trochlear, 48, 155, 234, 263, 276 
» vagus, 151, 154, 156, 173, 186, 356, 447, 449 
Nervous system, central, comparison of Vertebrate and Arthropod, 36, 457 
- " connection of, with muscular and epithelial tissues, 464 
“ 4 ts with retina, 71 
fF 99 disease of, 50 
os ‘3 evidence of, 8 
i on evolution of, 34 
a ‘i importance of, 16, 463, 482, 498 
ee » invertebrate, 10, 13, 54 
45 - origin of, 480 
“3 relation of germ-band to, 483 
segmentation of vertebrate, 51 
a ,, tube of, 36-51, 102, 211, 483, 455, 457 
4 vertebrate, 10, 18, 40, 41, 152 
‘si enteric, 447 
> sympathetic, 2, 424, 428, 448, 491 
Neurenteric canal, 37 
Neuroblast, 465 
Neuromeres, 55, 247, 262, 312, 316 
Neurones, 72, 92, 465 
Neuropil, 71, 91 
Neuropore, 220, 457 
Nose, 219 
» of Osteostraci, 329, 352, 458 
Notochord, 120, 122, 180, 181, 220, 244, 295, 318, 405, 417, 433, 486, 494 
OcExL1I, 70 
Csophagus of Ammoccetes, 405 
Pf . Arthropod, compared to tube of infundibulum, 4, 244, 440 
Olfactory apparatus, evidence of the, 218 
organs of the Scorpion group, 220 
a tube of Ammocestes, 219, 225, 244, 317 
Oligocheta, 421, 478 
Operculum of Eurypterus, 191, 212, 291 
Limulus, 189, 202, 235, 295 
Phrynus, 191 
Scorpion, 189, 206, 212, 372 
5 Thelyphonus, 189, 190, 206 
Organs, arrangement of, 10 
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