526 



INDEX 



Sea-gulls, pigment cells in parietal region, 



179 

 Sea-squirts, 168 

 Sebaceous material, 431 

 Secondary sexual characters, early appear- 

 ance, 476 

 Segmental papilla:, continuity of eyes with 



in Hirndo, 101 

 Selachia, structure of pineal organ of, 206, 



292 

 Semper's cells, 16 

 Sense-organs, absence of in adult Proto- 



chordata, 170 

 Sensory cells of retina of parietal organ, 70 

 Sensory vesicle, 



of ascidian larva;, 5, 175 



of pineal system, 184 

 Sepia, 147, 164, 354 

 Sepiolia, section through head of, 121 

 Septa, fibrovascular, 393 

 Septum interhemisphericum, 310 

 Sex, male, 431, 439 

 Shell(s), 



bivalve bilateral, 147 



bivalve dorso-ventral, 92 



flat spiral, 151 



fossil, 92 



helical spiral, 151 



straight, 151 



tubular, 150 

 Shell-fish, 



bivalved, 147, 167 



univalve, 151, 167 

 Shrimp, division of cells of ocelli, 24 

 Signs, 



general, 439 



local, 438 

 Single eye, of free-swimming larva of 



Phallusia, 5 

 Sinus, 



inferior sagittal, 310, 443 



superior, sagittal, 443 

 Skin, 



invertebrate type, 58 



vertebrate type, 58 

 Skink, 281, 283 

 Skull, opening of sutures, 452 

 Snake, ringed, 285 



Snakes, absence of parietal organ in, 252 

 Snail, stalked eyes of, 151 

 Somatic development, 



early, 425 



retarded, 425 

 Speech, 



dysarthric, 438 



slowness of, 455 



staccato, 438 

 Sphenodon, 



nerves of pineal organs, 258-263 



parietal foramen, 267 



parietal organ, 184, 240, 249, 253, 255, 



273 

 pineal region of, 369 

 pineal sac, 313, 314 

 Spermatogenesis, increase in pinealec- 

 tomized animals, 423 



Spha:ospheres, 373 

 Spider, embryo, 



anterior and ventral view, 378 



dorsal view, 376 



lateral view 377, 

 Spiders, 



cellar, development of eyes of, 127 



eyes of, 123, 371, 372, 473 

 Spinal cord, dorsal pigmented area of, 179 

 Spinax niger, 73 



imperforate parietal canal of, 209 

 Splenium, 



incision of, 444, 445 



relations of, 411, 413, 415, 416, 418 

 Spongioblasts, 322, 382, 387 

 Spoonbill, 73 



imperforate parietal canal of, 209 

 Spurs of cock, increase in pinealectomized 



birds, 422 

 Squalns acanthias, 202, 203, 204 

 Squid, 147 



Statocyst, 82, 150, 160, 175 

 Statocysts in larva of Dentaliwn, 161 

 Stature, ultimate in cases of mental and 



sexual precocity, 427 

 Stegocephala, 224, 235 

 Stemmata of blow-fly, 14, 363 

 Stieda's organ, 228, 229 

 Stirndriise, 74, 229 

 Stizostedion, pineal organs of, 217 

 Sterna hirundo, 75 

 Stomias boa, 23 

 Strabismus, 439 

 Strata, lower Silurian, 465 

 Stria medullaris thalami, 417 

 Strix flammea, Epiphysis of, 297, 313 

 Sturgeon, 



pineal diverticulum of, 211 



structure of pineal organ of, 210, 211 

 Stylonurus, 349 



Subcommissural organ, 261, 307, 311, 369 

 Subepidermal nerve net, 82 

 Superior colliculus, 415, 416 

 Supraoccipital cartilage, 369 

 Supra-oesophageal ganglion, 96, 132, 169 

 Suprapineal recess (dorsal diverticulum), 



307, 308, 416 

 Suspensory mechanism, of lens, 164 

 Swim bladder, 46 

 Sylvius, aqueduct of, 415, 416, 433 

 Symptomatology of pineal tumours, 435- 



440 

 Symptoms of pineal tumour, 477 

 Synapsida, 300 

 Syndrome, clinical, 435 

 Syringomyelia, 387 



Tabanus, 26 



Tcenia thalami, 326, 417 



Tapetal layer of retina in spiders, 125 



Tapetum, 346 



lucidum, 12 



non-cellular, 357 

 Tardigrade, 131 

 Tegu, 252, 279 



