INDEX. 



291 



Frog, segmentation, 27 



FuiTows of segmentation, 10 — 15, 27 



Ganglia of sympathetic nervous sys- 

 tem, 172 



Gastrasa theory, 69 



Gastrula, its absence in ElasmO' 

 branchs' development, 63 



Gegenbaur, meroblastic vertebrate eggs; 

 55; development of limbs, 104; ver- 

 tebral bodies, 126 ; notochord, 137 ; 

 formation of vertebrae, 150 ; sheath 

 of notochord, 155 ; ventral nerve- 

 cord, 171; cranial nerves, 192, 194; 

 vagus nerve, 20-4 



Genital ducts :— In male, 250—252; 

 In female, 253—260 



Gerbe, segmentation, 31 



Germinal disc, 7, 9, 10, 12 ; nuclei of 

 cells, 18 ; asymmetry of, 26 ; of 

 meroblastic o-viun, 56 



Germinal vesicle, 2, 3 ; atrophy of 

 the, 5 ; general conclusions on its 

 fate, 8 



Geryonia, protoplasmic net-work in 

 eggs of, 53 



Gills, their first appearance, 97; layer 

 from which they are derived, 211 



Gill-shts, formation of, 210 



Glossopharyngeal nerve, development 

 of, 202 



Gotte, Dr, germinal vesicle, 5, 6, 9; 

 segmentation, 23, 27 ; formation of 

 layers, 46 ; vertebrate eggs ; de- 

 velopment of Hen's egg, 55 ; sections 

 of Bombinator igneus, 61 ; eggs of 

 osseous fishes, 67 ; embryo of Am- 

 phibians, 91 ; muscular system of 

 Amphibians, 115 ; nuclei of primi- 

 tive ova, 132, 137 ; lateral nerve, 

 141, 146; haemal arches, 150; spinal 

 ganglia and nerve fibres, 164; de- 

 velopment of the eye, 185; mouth 

 involution, 189 ; cranial nerves, 192 ; 

 segmentation of head, 212; thyroid 

 body, 225 ; liver, 226 ; subnoto- 

 chordal rod, 227, 229 ; double for- 

 mation of heart, 231 



Giinther, development of limbs, 103 



Haeckel, Prof., formation of the lay- 

 ers, 37, 46; vertebrate gastrula, 64; 

 eggs of osseous fishes, 67 ; blasto- 

 pore, 68; segmentation, 69, 70; me- 

 soblast, epiblast and hypoblast, 118 



Hanstein, division of nuclei in Dicoty- 

 ledons, 20 



Head of embryo, 72, 73, 78, 79, 86 ; 

 nervous canals, 144 ; their nerve- 



supplv, 145 ; development of organs 

 of, 174—216 



Heart of embiyo, 76 ; its development, 

 230 ; comparison with other types, 

 231; double formation of, 230—233 



Hensea, formation of the layers, 68, 

 69 ; development of notochord in 

 Mammalia, 95; embryo of Mamma- 

 lia, 114; development of nerves, 161, 

 163 ; double formation of heart, 231 



Hepatic cylinders of liver, 226 



Heptanchus, 215 



Hertwig, knobbed nuclei, 23; forma- 

 tion of the layers, 40 ; placoid scales, 

 141 



Hexanchus, 215 



His, Prof., vertebrate eggs, 55, 68; 

 development of the heart, 232 



Holoblastic eggs, 27, 55, 56 



Horny layers of epiblast, 99 



Huxley, Prof., development of brain, 

 181 ; brain and skull of Amphiosus, 

 214 



Hyaloid membrane, 188 



Hydra, 162; yolk-cells, 7; segmenta- 

 tion, 29 



Hydrozoa, germinal vesicle, 8; deriva- 

 tion of ova, 134 



Hvmen, 267 



Hypoblast, 43, 45, 47, 48, 50, 51, 62, 

 66, 69; inElasmobranchs and Bombi- 

 nator igneus, 58, 60, 61; stages B 

 — G, general features, 92 ; notochord 

 developed from the, 94 



Hypoblast of the head, 210, 211 ; for- 

 mation of the gill-slits, 210; layer 

 from which gills are derived, 211 



H}-poglossal nerve, development of, 

 205 



Impregnation of eggs, 10, 32 

 Insects, derivation of mesoblast, 121 

 Inter-renal body; its structure in the 

 adult, 244 ; its development, 245 



Jackson and Clarke, anatomy of cranial 

 nerves, 194, 195 ; vagus nerve, 205 



Kidney, glandular tubuli of, 255 ; gene- 

 ral accoimt, 257, 272 ; details of for- 

 mation of ureters, 273 ; primitive 

 condition in an Elasmobranch em- 

 bryo, 281 



Klein, segmentation, 28 ; embryo of 

 Teleostei, 89 



Kleinenberg, atrophy of the germinal 

 vesicle, 6, 7; segmentation, 29; for- 

 mation of layers, 40; derivation of 

 limb-muscles, 149 



Knobbed nuclei, 39, 40 



