NDEX. 



A. 



Acoustic nerve, pig, 12 mm., 213 

 Allantois, anlage of, chick, 289, 290 



early human, 136 



general account, 103 



in umbilical cord, no, 351 



mesothelial villi of, 222, 253 



pig, 9 mm., 221 



pig, 17 mm., 239 



pig, 24 mm., 268 



relation to chorion in ungulates, 105 

 Alum cochineal, 367 

 Amiurus, section of, 108 

 Amnio-cardiac vesicles, chick, 295, 300 

 Amnion, anlage of, 78 



at seven months, 327 



chick, 278, 282 



fold of, 286, 287 

 raphe of, 278, 282, 284 



early human, 134 



origin of, in primates, 117 



structure of, 345 

 Amniota, 22 

 Amphibia, 23 

 Amphioxus, 25 

 Anal plate, loo 

 Anamniota, 22 

 Angioblast, early condition, 88 



of chick, 295 



origin of, 74 

 Anlage, definition of, 25 

 Annelids, 25 

 Anura, 23 

 Aorta, chick, 277, 280 



descending, pig, 9 mm., 227 



dorsal, pig, 12 mm., 201, 202 



first appearance, 93 



median dorsal, chick, 280, 287 

 pig, 9 mm., 224 

 pig, 17 mm., 234 

 pig, 20 mm., 245 



muscularis of, 233 



origin of adult, 164 



pig, 24 mm., 267 



Aortic arches, chick, 275, 276, 277, 280 

 fourth, pig, 9 mm., 218 



Aortic arches, course of, 194 



embryo with two, 136 

 embryo with five, 138 

 general account, 164 

 pig, 9 mm., 227 

 pig, 12 mm., 189 

 Appendages, embryonic, 78 

 Arachnoid, pig, 12 mm., 180 

 pig, 17 mm., 233 

 pig, 20 mm., 242, 254 

 Arch of vertebra, pig, 20 mm., 244 

 Area opaca, defined, 87 

 of chick, 273 

 pellucida, defined, 86 

 of chick, 272, 295 

 vasculosa, 88 



circulation of, 97 

 main vessels of, 97 

 of chick, 297 

 . vitellina, defined, 87 

 Arteries, allantoic, chick, 287 



basilar, pig, izjnrn., 207, 213 

 carotid, general account," 164 



pig, 12 mm., 178, 180 

 caudal, 247 

 central, of retina, 263 

 innominate, 168 

 intersegmental, 215, 219 



pig, 6 mm., 231 

 lingual, 259 



omphalo-mesaraic, chick, 273, 287 

 pulmonary, pig, 12 mm., 196 



pig, 20 mm., 247 

 sulci, 242, 247 

 umbilical, pig, 17 mm , 239 

 vertebral, pig, 12 mm., 191 



pig, 24 mm., 266 

 vitelline, chick, 273, 287 



pig, 9 mm., 221 

 Ascending trigeminal tract, 177 

 Atriozoa, 25 

 Auditory invaginations, 274, 275 



vesicle. See Otocyst. 

 Auricle, right, pig, 12 mm., 198 

 Auricular canal, 199 , 

 Axis, primitive, 65 



structural, 19 



371 



