INDEX 



515 



Eye(s) — continued 



non-faceted, lateral, in, 113, 116, 123, 

 124 



pallial, 148, 149 



parietal, 188, 243, 379 



reduction in number, in Polychcetes, 100 



of Salpa, 177 



scheme showing distribution of different 

 types of, 478 



schizochroal, 137, 349 



sessile, 151, 342 



simple, 48, 97, 116, 147 



single, 21, 175, 176 



solitary, 175, 176 



stalked, 16, 22, 105, no, 151 



tentacular, 93, 94, 346 



triangular disposition of frontal ocelli, 

 342, 343, 345 



of trilobites, 136-146 



triplacodal, 360, 361, 362 



triplostichous, 371 



types of, 10 



upright, 12, 14, 97, no, 116 



of Urochorda, 168 

 Eye-spot(s), bilobed form in Amphioxus, 

 215 



on apical plate of trochophore larva;, 88 



of Aurelia aurita, 81 



of Euglena, 66 



in larva of Botryllus, ijj 



in larva of Oikopleura, 177 



marginal, 25 



paired, 84 



of Planaria, 25 



of Rotifera, 89 



temporary, 84, 85 



Yungia aurantiaca, 84 

 Eye-vesicle, 378 

 Eylais, eyes of, 129 



Facets, 



corneal, 52, in 



hexagonal, 116 



number of in eyes of insects, 116 

 of Trilobites, 136 

 Falx cerebri, 310, 443 

 Fasciculus retroflexus Meynert, 468 

 Fat tissue, 431 

 Fibres, 



collagenous, 319 



glial, 319 

 Fields of vision, in Hydrachnida, 130 

 Fins, pectoral, 



of Bothriolepis, 470 



of Pterolepis, 347 

 Fish(es), 



absence of pigmentation over parietal 

 area, 72, 73 



bony, pineal organ of, 217 



cartilaginous, pineal organ of, 210 



deep sea, 238 



palaeozoic, 327, 468 



types of, 200 



vestigial condition of pineal system in, 

 200 



Fits, epileptiform, 439 



Flame cells, 89 



Follicles, of pineal organ of birds, 288 



Foot-plates, 383, 384 



Fornix, 415, 416, 418 



anterior pillar of, 417 

 Frog tadpole, 



pineal diverticulum of, 228 



Stieda's organ, 233 

 Frontal 



eyes, of Epeira diaderma, 124 



gland, 229, 230 



organ, 74, 185, 228, 229 

 failure of development, 185 

 functionless condition of, 185 



organs, of Phyllopods, 363 

 Function, 



change of, 46 



effects of disuse of organs, 238 



of epiphysis in Anura, 230 



of parietal organ in Anura, 230 



of pineal body, 421, 476 

 Fundulus 



cyclopia, 37, 38 



differential inhibition of growth, 37 

 Fusion 



of bilaterally paired organs in median 

 plane, 26, 27, 36, 37, 187 



of eyes, in Hydrachnida, 130 



theory of Duplicitas, 44 



Gadfly, frontal ocellus of, 26 

 Gait, 



staggering, 449 



unsteady, 449, 453 

 Galen, great vein of, 415, 416, 435, 444 

 Gallus domesticus, 296 

 Gammarus, photo-chemical changes in 



retinal pigment, 65 

 Ganglia habenulae of Zoarces vivipara, 294 

 Ganglion 



cells, 69, 70, 144, 211, 249, 255 



conari (Pastori), 410, 416 



habenula;, 7, 19, 188, 194, 197, 205 



infra-oesophageal, 96, 113 



supra-cesophageal, 96, 132 

 Ganoid fishes, 



dorsal sac of, 216 



pineal organ of, 217 

 Gasteropoda, 147, 151 



fossil shells of, 161 

 Gastrula;, 



grafting experiments, 34, 35 



multiple, 42 



twin, 43, 44 

 Gastrular invaginations, multiple, 41 

 Gecko, 252, 269 



retrogressive changes in epiphysis of, 

 272 

 Geckonida;, 272 

 Gehyra, 252, 272 

 Genal angles of head-shield of Trilobites 



142 

 Genital organs, precocious development of, 

 476 



