518 INDEX 



Lens, 



degeneration of, 254 



dependent differentiation of, 55 



development of, 55 



formation of from edge of optic cup, 56 



multiple, 131 



non-cellular, 49, 97, 164 



of parietal organ, 20, 69, 273 



seam or notch in, 256 



self-differentiation of, 55 



structure of, 257 



vitreous, 14, 48, 49, 97, 368, 372 

 Lens vesicle, of lateral eye of Ammoccetes, 



375 

 Lentigen cells, 118, 119, 368 



Lepidosiren, 221, 335 



brain of, 222 

 Lepidosteus, 235, 337 

 Lepidurus, 90, 103, 106, 328 

 Lepomis, pineal organs of, 217 

 Leptodora, single eye of, 27 

 Lethargy, mental, 438 

 Leuciscus, pineal organ of, 219 

 Lias, strata, 354 

 Light, 



effects on protoplasm of, 366 



emission of, 24 



influence in formation of pigment, 57 



production of changes in epithelium, 57 



reflected, 12 



regulation of, 61 



sensitivity of branchial eyes to, 67 



sensitivity of earthworm to, 99 



sensitivity of parietal organ to, 6 

 Lime, concretions of, in pineal eye, 64, 70 

 Limnesia, eyes of, 129 

 Limpet, 48, 147 

 Limulus, 133, 134, 359, 473 



absence of antennae in, 136 



affinities of, 135, 328 



resemblance of eyes to those of scorpions, 



133 



trilobite stage of, 108, 359 

 Limulus polyphemus, 61 



median eyes of, 125, 366 



lateral eyes of, 124, 366 

 Linguatulida, 131 

 Lizard, 



Australian, 273 



Frilled, 273 



Horned, 245, 273 



Thorny-tailed, 273 

 Lobus cerebralis, 



anterior, 166 



medius, 166 



posterior, 166 

 Lobus opticus, 164, 166 

 Lorrenz, ampulla; of, 73 

 Lumbar puncture, 458, 461 

 Lumen, virtual, of epithelial cords, 313, 314 

 Lyriocephalus, 252 



Macrogenitalismus praecox, 427 

 Macrogenitosomia praecox, 8, 477 

 Mammal-like reptiles, 300 



Mammals, pigmentaton of pineal organ 



in, 76 

 Mantle, pallialor marginal eyes of, 148, 149 

 Mantle zone, see Nuclear zone, 304, 309, 



318, 322 

 Marginal body, vitreous, 131 

 Marginal zone, 304 

 Mastodonsaurus, 235 

 Median eye(s), 



of Acipenser, 211 



of Agelena, 128, 371 



of Ammoccetes, 191 



of Amphibia, 228, 235, 236, 237 



of Anaspidce, 331 



of Apis, 342 



of Aptis, 104 



of Arthropoda, 103-146 



of Auchenaspis, 191 



of Blow flies, 14 



of Bombinator, 231 



of Branchipus, 145, 362 



burial beneath roof of skull, 143 



of Carididce, 144 



of Cephalaspis, 191 



of Cladocera, 27 



of Copiophora, 345 



of Crustacea, 103 



of Cyclops, 109 



of Cyclops monsters, 30-47 



of Cyclostomes, 287 



of Cypris, 108 



of Didymaspis, 191 



of Dinichthys, 330 



in domestic animals, 35, 36 



in duplicitas anterior, 33 



in duplicitas cruciata, 34, 35 



of Entomostraca, 109, no, 360, 361, 362, 

 363 



of Epeira, 124 



of Eurypteridce, 135 



of Euscorpius, 133 



of extinct vertebrates, 327 



formation of, 47 



frontal, 26, 363 



in Fwididus, 38 



fusion of paired eyes, 543 



of Geotria, 188 



of Honey-bee, 122 



of Hydrodroma, 130 



of Ichthyosaurus, 268 



of Insecta, 116 



of Invertebrates, 363, 368, 370 



of Kiceraspis, 328 



of Lepidurus, 106 



of Limulus, 125 



loss of function in adult animals, 145 



of mammal-like reptiles, 299-302 



of Nothosaurus, 268 



origin of 



anterior dichotomy, 33 



arrest of development of interocular 



region, 47 

 bifurcation of anterior end of prim. 



streak, 39 

 cleavage of single gastrular invagina- 

 tion, 40 



