INDEX 



945 



Ear, development of, 850, 853 

 external, 851 

 structure of, 853 

 Echidna, blastoderms of, early, 362 

 blastula of, primary, 363 

 blastula of, secondary, 363 

 cleavage in, 324, 325 

 egg of, 76 



characteristics of, 205t 

 fertilization in, 254, 255 



site of, 205t 

 maturation in, 254 



sperm entrance into egg, place of, 205t 

 Echidna aculeata, xix 

 cleavage in. 326 

 egg of, telolecithal, 255 

 Echinarachinus, separation of fertilization 



membrane in, 237 

 Echinochrome A, 228 

 Ectobronchi. of chick, 645, 647 

 Ectoderm, introduction of word, 347 

 Ectodermal expansion, 395 



{see also Epiboly) 

 Edentata, xx 



bony armor of dermal. 697 

 Edinger-Westphal nucleus, of oculomotor 



nerve, 828 

 Effector structures, 807 

 Efferent ductules, activities of in sperm 

 transport, 180 

 of epididymis, 793 

 Efferent fiber, 816 

 Efferent neurons, 826 

 Efferent system, of aortal arches, 760 

 Egg {see also Oocyte) 

 Egg(s), activation of {see also Activation, 

 of egg) 

 artificial, 217 



mechanical, of Asterias forbesi, 219 

 cellular injury in, 219 

 complete, 212 

 natural, 216 

 partial, 212, 217 

 ribonuclease in, 219 

 types of, 216 

 and developing yolk body, of fowl, 755 

 bilateral symmetry of, 161, 162 

 chart of passage from ovary down ovi- 

 duct. 317 

 chordate. characteristics of, summary, 

 203t 

 fertilization, site of. 203t 

 cytoplasmic differentiation of, 154 

 definition of, 125, 154 



Harvey's conception of. 55 

 demersal. 251 

 development of, summary of, 170t 



Egg(s) — {Continued) 



exudation of substances from at fertili- 

 zation. 240 

 fertilization of, in Amphioxus, 227 

 summary of activities of in initial 

 stages, 233 

 homolecithal, 156 

 inhibited or blocked condition of, at 



fertilization, 221 

 invisible morphogenetic organization of, 



160 

 isolecithal, 156 



maturation of. in Amphioxus, 227 

 in Styela (Cynthia) partita, 224 

 migration of. to brood pouch of male 

 pipefish, 199 

 external (peritoneal), 199 

 and ciliary action in frog. 201 

 internal (oviducal), 199 

 in frog, 201 

 monospermic, 259 



numbers produced by different verte- 

 brate ovaries, 81 

 of bitch, formation of first polar body, 



222 

 of frog, cleavage plane of, first, 292 

 second, 292 



third or latitudinal, 293 

 fertilization of, 247 

 of hen, fertilization processes in, 251, 

 252 

 maturation in, 252 



first division, 253 

 vitelline membrane (zona radiata) of, 

 167 

 of rabbit, development of, early, 300 



fertilization stages in, 251 

 of teleost fish, fertilization of, 249 

 organization of, dependence of first 



cleavage spindle upon, 285 

 parthenogenesis from non-sexual, 216 

 pelagic. 251 



pigeon, fertilization processes in, 251 

 polarity of, 161 

 polyspermic, 259 



secretion of, in egg water of /I r6ac/a, 225 

 sperm entrance into, 203t 

 surface of, contraction of during fertili- 

 zation, 240 

 telolecithal, 156 

 telolecithality, 156 



transport of, from ovary to site of fer- 

 tilization, 199 

 from ovary to uterine tube, and estro- 

 genic hormone, 200 

 in amphibia other than frog. 202 

 in birds, 199 

 in ectopic pregnancy, 201 



