466 
Cerebellum, 155, 251 
Cephalic mesoblastie 
269, 428 
Cerebral flexures, 149, 245 
Cerebral ganglia, 157-162, 262 
Cerebral hemispheres, origin of, 151; 
(see telencephalon) 
Cervical flexure, 1338, 245 
Chalazee, 1S 
Chemical composition of 
hen’s egg, 20, 21 
Chiasma opticus, 154, 249 
Choane, 215, 285 
Chondrification, 408 
Chorion, 135, 217, 218, 220 
Choroid coat of eye, 279; fissure, 
166, 281; plexus, 248 
Chromaffin tissue, 404 
Chronology, 64 
Cilary processes, 272, 274 
somites, 108, 
of 
parts 
Cireulation of blood, 121, 122, 197- 
200, 372-376 
Cireulation of blood, changes at 
hatehing, 3876; completion — of 
double, 355 
Classifieation of stages, 64-67 
Clavicle, 434, 435 
Cleavage of ovum (hen), 39-43 
Cleavage of ovum (pigeon), 43-47 
Cloaeca, 314-319; (see hind-gut) 
Cloneal membrane, 315, 318; (see 
also anal plate) 
Coeliac artery, 363 
Coelome (see body-cavity) 
Ccenogenetic aspects of 
ment, 6 
Collaterals, origin of, 238 
Collecting tubules of mesonephros, 
379, 380 
Colliculus palato-pharyngeus, 398 
Commissura anterior, 252; inferior, 
252; posterior, 252; trochlearis, 252 
Concrescence, theory of, 82, 84 
Cones of growth, 235 
Conjunctival sac, 279 
Coprodeum, 315, 318, 319 
Coracoid, 484, 455 
Cornea, 278 
Corpus striatum, 247 
Corpus vitreum, 275 
Cortical cords of suprarenal] 
sules, 405 
Cranial flexure, 133, 245; nerves, 261 
Cristee acusticw, 295 
Crop, 312 
Crural veins, 372 
Cushion septum, 355 
Cuticle of shell, 17 
Cutis plate, 185, 188 
develop- 
cap- 
INDEX 
Delimitation of embryo from  blas- 
toderm, 91 
Dendrites, origin of, 236 
Determinants, 7 
Diencephalon, early development. of, 
152; later development of, 249 
Dorsal aorta, origin of, 121 
Dorsal longitudinal fissure and sep- 
tum of spinal cord, 248, 244 
Dorsal mesentery, 172, 342 
Duct of Botallus, 359, 361, 376 
Ducts of Cuvier, 200, 204, 207, 364 
Duetus arteriosus (see duct of Bo- 
talus); choledochus (common. bile- 
duct), 181, 321; cochlearis, 293; 
cystico-entericus, 321; endolymph- 
aticus, 169, 289; hepato-cysticus, 
321; hepato-entericus, 321; veno- 
sus {see meatus venosus) 
Duodenum, 310, 311 
Ear, later development of, 288 
Eetamnion, 138 
Eetoderm and entoderm, origin of, 52 
Eetoderm of oral cavity, limits of, 
301 
Ege, formation of, 22, 
EKee-tooth, 302, 308 
Imbryonic circulation, on the fourth 
day, 372-374; on the sixth day, 
374; on the eighth day, 374-376 
Embryonic membranes, diagrams of, 
219, 220; general, 216; origin of, 
135; summary of later history, 145 
Endocardium, origin of, 119 
Endolymphatic duct (see 
endolymphaticus) 
Endolymphatic sac (see saccus endo- 
lymphaticus) 
Entobronchi, 327, 328 
Entoderm, origin of, 52 
Ependyma, origin of, 239 
Epididymis, 391, 398 
Epiphysis, 153, 249 
Epiphyses (of long bones), 409 
Epistropheus, development of, 420 
Epithalamus, 251 
Epithelial cells of neural tube, 233, 
234 
Epithelial vestiges of visceral pouches 
309 
Epodphoron, 401 
Equatorial ring of lens, 277-278 
Excentricity of cleavage, 41, 47 
Excretory system, origin of, 190 
External auditory meatus, 297, 3800 
Iexternal form of the embryo, 211 
Eye, early development of, 164; 
later development of, 271 
Kyelids, 279-280 
24, 25 
ductus 
