378 



INDEX. 



Placenta, foetal blood supply of, 339 

 in situ, 329 



maternal blood supply of, 341 

 Placentalia, 24 

 Plakodes, chick, 293 



olfactory, pig, 9 mm., 219 

 Plate, anal and oral, loo 

 Pleural cavity, pig, 17 mm., 234 



pig, 20 mm., 251 

 Pleuro-peritoneal space, 82 

 Plexus, bracliial, pig, 12 mm., 196, 199 

 choroid of hind-brain, 266 

 of lateral ventricle, 257 

 pig, 24 mm., 265 

 lumbar, pig, 20 mm., 247 

 Polar globules, 47 



mouse, 312 



formation of first, 3 1 3 

 formation of second, 313 

 formation of single, 314 

 Post-optic lamina, 207 

 Premandibular cavity, 83 

 Preservation in alcohol, 365 

 Preserving methods, 363 

 Primates, 25 

 Primitive axis, 65 

 body-cavity, 20 

 groove, chick, 274, 296 

 first appearance, 62 

 knot, 62 



rabbit, 309, 310 

 streak, chick, 297, 303 

 first appearance, 62 

 obliteration of, 65 

 rabbit, 310 

 structural axis, 19 

 Pro-amnion, chick, 279, 295 

 origin of, 75 

 young chick, 300 

 Processes, costal, 233 

 Pro-chorion, 59 

 Projections, morphological, 37 

 Pronephros, morphology, loi 

 Pro-nuclei, fusion of, 52 

 Pro-nucleus, female, 49 

 mouse, 315 

 male, 51 

 Prosencephalon, pig, 9 mm., 222 



pig, 12 mm., 205 

 Proto-vertebrce, 80 

 Pupil of eye, 262 



Raphe of amnion, chick, 278, 282, 284 



of medulla, 180 



of medulla oblongata, 211 

 Rauber's layer, 307, 310 

 Recapitulation, law of, 41 

 Recessus lateralis of hind-brain, 208 

 Reconstruction, methods of, 356 



by drawings, 356 



by wax plates, 358 



Reduction division, 47 



Regression of cells, 31 



Renal anlage, 238 



Reptiles, 23 



Restriction, genetic, 30 



Retina, anlage of, chick, 276, 277 



pig, 12 mm., 186 



pig, 24 mm., 262 

 Rhomboidal sinus, 296 

 Ribs, anlages of, 233 



pig, 20 mm., 250 

 Ridge, urogenital, 21 

 Rodents, 25 

 Roots, lateral, of cephalic nerves, 211 



of nerves, ventral, 196 

 dorsal, 196 



S. 



Sauropsida, 23 

 Scapula, 244 

 Schlemm, canal of, 262 

 Sclerotome, pig, 6 mm., 230 

 Segmental vesicle, 8i 

 zone, 79 



chick, 288, 292 

 Segmentation, two-cell stage, 57 

 four-cell stage, 58 

 of Limax ovum, 55 

 of mammalian ovum, 54 

 of the ovum, defined, 25 

 mouse, 312 

 Segments, chick, 287, 292 



in surface view, 274 

 secondary, 283 

 external, of pig, 162 

 pig, 6 mm. , 230 

 primitive 79 



chick, 296, 304 

 secondary, 81 



pig, 6 mm., 231 

 pig, 9 mm., 217 

 Sella turcica, 265 

 Sense organs of vertebrates, 21 

 Septum, nasal. See N'asal septum. 

 transversum, chick, 283 

 origin of, 82 

 pig, 20 mm., 252 

 Sexual cords, 251 

 Shield, embryonic, 62 



rabbit, 307, 308, 309 

 in section, 310, 311 

 Shrinking of embryo in paraffin, 175 

 Sinus, cervical, pig, 12 mm., 191 

 rhomboidalis, 296 

 superior longitudinal, 180, 190 

 terminalis of chick, 91, 98, 273 



of rabbit, 100 

 venosus, chick, 98, 283 

 Sinusoid of heart, 199 



pig, 9 mm., 221 

 of liver, 204 



chick, 283 

 of Wolffian body, 204, 221, 225, 235 



