INDEX. 



379 



Skin, outer, pig, 12 mm., 181 

 Skull, anlage of membranous, 254 

 Snout, pig, 20 mm., 254, 255, 256 



section of, 240 

 Somatic cavity, 82 



cells, 27 

 Somatopleure, 76 



extra-embryonic, chick, 286 

 pig, 12 mm., 202 

 vertebrate, 22 

 Special sense organs, 21 

 Spec's embryo, 129 

 Spermatozoon, 44 



entrance of, into ovum, 50 

 Sphenoid cartilage, 265 

 Spinal cord, anterior fissure, 242 

 chick, 280, 288 

 differentiation from brain, 73 

 pig, 6 mm., 230 

 pig, 17 mm, 233 

 pig, 20 mm., 241 

 pig, 24 mm. , 266 

 ganglia, descent of, 242 

 nerves. See Nerves, spinal. 

 Splanchnoccele, defined, 79 



origin of, 82 

 Splanchnopleure, 76 



of vertebrates, 22 

 Staining, counterstaining, 368 



methods of, 367 

 Stomach, 204 



pig, 24 mm., 267 

 vertebrate, 21 

 Streak, primitive, chick, 297 

 Striae acusticte, pig, 12 mm., 183 

 Structure, vertebrate type of, 18 

 Subzonal layer, 58, 307, 308 

 Suprarenal, development, 267 



pig, 24 mm., 267 

 Surface and mass, 37 

 Sympathetic, cervical, pig, 12 mm., 194 

 pig, 17 mm., 234 

 pig, 20 mm., 242 

 pig, 24 mm., 267 

 thoracic, pig, 12 mm., 201 



Teleosts, 23 



Tellyesnicky's fluid, 364 

 Terminal sinus of chick, 273 

 Testis, pig, 24 mm., 267 

 Thymus, pig, 12 mm., 191, 209 

 Thyroid, pig, 12 mm., 208 

 median, 191 



pig, 20 mm., 244 

 Tissues, classification of, 35 

 Tongue, anlage of, 140, 207 



pig, 20 mm., 240, 255, 259 



pig, 24 mm., 267 

 Trachea, pig, 12 mm., 191, 195, 20I 



pig, 20 mm., 242, 246 

 Tractus solitarius, 213 



Trigeminal nerve, pig, 12 mm., 212 



tracts, 177 

 Trophoblast, general account, 106 



human, 342 



in primates, 116 



of human embryo of the second stage, 125 



of monkey, 122 

 Tuber cinereum, 207 

 Tuberculum impar, 140 

 Tunica albuginea, 251 



vasculosa of eye, 259 

 Tunicata, 25 

 Turbinal folds, 255, 256 



U. 



Umbilical coelom, pig, 9 mm., 226 

 pig, 17 mm., 239 

 cord, 320, 322 



connection with chorion, 12I 

 general account, 109 

 pig, section of, 239 

 placental insertion of, 339 

 structure of, 351 

 opening, pig, 9 mm., 221, 223, 224 

 Undifferentiated stage, 27 

 Unguiculates, 24 

 Ungulates, 24 

 Urethra, 247 

 Urodela, 23 

 Urogenital ducts, 21 



ridge, 21 

 Uterine glands, degeneration of, 323 

 Uterus, histology of, 316 



pregnant, general account, 119 



two stages of, 319 

 three months pregnant, 319 

 seven months pregnant, 321 

 Uvea, pig, 24 mm., 262 



V. 



Vagus nerve, pig, 17 mm., 234 

 pig, 20 mm. , 244, 246 

 Valves, atrio- ventricular, pig, 12 mm., 199 

 Eustachian, I98 

 Thebesian, 198 

 venous of right auricle, 198 

 Vasoformative cells, 93 

 Veins, allantoic. 141 



anterior cardinal, pig, 183 

 pig, 12 mm., 213 

 axillary, pig, 12 mm., 196 

 cardinals, I41 



chick, 98, 280, 282, 284 

 pig, 9 mm., 225 

 pig, 12 mm., 201 

 pig, 17 mm., 234 

 cava inferior, origin of, 226 

 pig, 12 mm., 204 

 early disposition of, 168 

 first embryonic, 141 



