586 EMBRYOLOGY OF THE LOWER VERTEBRATES 



Fowl (continued) 



segmentation, 516, 517 

 Fronto-nasal process, 147, 555 



Gamete, 1 



Ganoids, actinopterygian (Acipenser, Amia, 

 Lepidosteus) 



cement-organs, 180 



gastrulation, 47 



opisthonephros, 259 



ovary, 277 



pancreas, 189 



practical hints, 563 



pronephros, 234 



segmentation, 23, 24 

 Ganoine, 326, 336 

 Gastraea, 506 

 Gastrula, 30 

 Gastrulation, 30 

 Gecko 



endolymphatic duct, 132 



gastrulation, 48, 50 

 Genital fold, 268 



pores, 246 



ridge, 267 

 Geotria 



pineal eyes, 100 

 Germ cavity, 16 



layer theory, Historical note, 505 



layers, delimitation, 150, 181 



wall, 17 



Germinal epithelium, 268 

 Gills- 

 evolutionary history, 160, 449 



external, 154, 155, 157, 450 

 as forerunners of limbs, 449 



internal, 159 

 Glomerulus, 223 

 Glottis, 161 

 Gonad, 266 

 Gonocytes, 266 

 Grafted limb of Toad, 115 

 Gymnarchus 



egg, 20 



external form, 432 



gill-filaments, 160 



nophiona 



.-xternal gills, 155, 156 



gastrulation, 42, 43 



pronephros, 223 



segmentation, 28 



Hali-'iinlar commissure, 89 

 ganglia. 



:ial arches, 292, 296 

 process, 297 



spine., 297 



Haj.loi.l, 17 



n.-.-i.i ioM. . 



general morphology, 498 

 ).r.. -hH, 53, 621 



n "I, 208, 601 



< r;il iiioj pholo^y, o70, 391 



Hemispheres, cerebral, 86, 91, 95 



Hippocampus, 91 



Holoblastic, 7 



Holouephros ( = archinephros). 221 



ffyla 



extemal gills, 156 



with eggs, 462 

 Hyostylic skull, 320 

 Hypobranchial, hypoglossal, muscles, 212, 



213 



Hypochord, 290 

 Hypogeophis 



chromophile organs, 284 



external form, 437 

 gills, 155 



gastrulation, 42, 43 



interrenals, 284 



opisthonephros, 246 



pharyngeal clefts, 159 



pronephros, 224-227 



thymus, 177 

 Hypophysis cerebri, 143 



Ichthyophis 



intestine in section, 186 



modelling of intestine, 183 



segmentation, 28 

 Iguana, pineal eye, 97 

 Infundibular gland, 90 

 Inftmdibulum, 86 

 Intermediate cell-mass, 253 

 Interrenal, 283 



Intestine, 145, 183, 184, 185, 186 

 Invagination, 32 

 Iris, 136 

 Isolecithal, 4 



Jacobson's organ, 128 



Kidneys, evolutionary origin, 217, 221 



Labial cartilages, 307 

 Lacerta 



archenteron, 51 



heart, 380 



neural arches, 296 



pancreas, 191 



pineal eye, 97, 98, 99 



tympanic cavity, 343 



venous system, 422, 424 



yolk-plug, 50 

 Lachrymal groove, 551 



a, 129 



Lamina teniiinalis, 90 

 Larvae, evolutionary significance, 492 

 Lateral line organs, 13'J 

 Latitudinal, 6 

 Leu, i:w, 138, 139 

 Lepidosiren 



brain, 85, 86, 87, 88 



lnieeal cavitN, 149 



rcinrnt oi-ans, 78, 79 



rlioiitlril'uMtinii ol imtorlionlal >lieatli, 

 293 



, .'H)S, 309, 311 



