INDEX 



467 



(Amphioxus, pages 1-61; frog, 62-228; 



placode, glossopharyngeal, 329 ; - 

 lateral line, 156; - lens, 146; 

 olfactory, 131, 153, 154; 

 -vagus, 329 



plane, first cleavage, 11: 89 ff.; 243: 

 382; - - gravitational, 86; - 

 of symmetry of ovum, 4, 6, 10, 11, 

 17:70,80, 83 ff., 87, 88 ff.; - 

 - of blastula, 96 



plate, anal, 280, 296, 296, 297, 334; 



basal, placental, 449; 

 basal, cranial, 211, 212, 213; - 

 closing, 449, 450; cutis, 



171-172, 171: 352-353; - - gill, 

 65, 122; - - hypobranchial, 217, 

 218, 218 ; internasal, 210, 211, 215; 

 -lateral, 31: 123-124, 170, 171, 

 194: 263, 278; medullary 



(neural), 21, 22: 65, 110-111, 110, 

 117, 124: 269, 270, 278; 

 parachordal, 210, 211 ; - - primi- 

 tive, 247, 252, 253, 254 ; - - sense 

 123; - - velar, 162, 180; - 

 vertebral, 170, 194: 263, 278 



plectrum, 153, 213, 214 



pleural, cavity, 351; - groove, 

 310, 351 



pleuro-peritoneal membrane, 352 



plexus, choroid, of iii ventricle, 130, 

 133: 305, 307; - of iv 



ventricle, 134: 305, 308; - - pre- 

 vertebral, 312; - splanchnic, 



312 



plug, yolk, 65, 99, 101, 102, 120 



polar bodies, 5, 8, 10: 70, 75, 81, 82: 

 340,341:377,378,380 



polarity, of ovum, 4, 5, 6, 10, 11, 17: 

 69, 70,83:232-233 



polyspermy, 79: 241 



pons Varolii, 307 



pore, cleavage, 14 



portal, intestinal, anterior, 261, 262, 

 266, 269, 272, 276, 278, 282, 291, 

 304, 345 ; - - posterior, 280 ; 



see also vein. 



position of embryo in "ovum," 243; 

 - change in, 284 



postanal gut, 170: 280, 296, 296, 334 



postbranchial bodies, 331, 331 



pouch, branchial (gill), 41, and see 

 pouch, visceral; - - hyobranchial, 

 162; hyomandibular, 160, 



160, 161, 162: 324, 330; 

 Seessel's, 304, 328, 329;- -vis- 

 ceral, 41: 122, 158, 160, 160, 163, 

 164: 269, 278, 328 ff., 329 



preoral, cavity, 25, 32, 33; - - gut, 

 262,304,328,329;- - pit 25, 32, 

 33, 44 ff. 



pressure, effect upon symmetry, 88 



chick, 229-367; mammal, 368-454.) 



Primates, allantois, 434, 436; am- 

 nion formation, 424; endoderm 

 formation, 385; implantation, 421; 

 ovulation, 379; placentation, 439, 

 440; proamnion, 428; trophoblast, 

 389; trophoderm, 422; uteri, 372; 

 yolk-sac, 433 



primitive, folds, 253, 254 ; 



groove, 119, 120: 252, 252, 253, 

 254, 263, 268: 395, 396, 398, 401; 



- knot, 252, 253, 257, 260 : 394, 

 395,396;- -200:398;- -plate, 

 247, 252, 253, 254; - streak, 

 119, 120: 251 ff., 252, 254, 258, 

 260, 274: 394, 395, 396, 398, 401; 



- streak, relation to embryo, 

 256 ff., 258, 260 



proamnion, 252, 255, 260, 262, 263, 

 263, 266, 274, 282, 292: 426 ff. 



process, ascending, of palate-quad- 

 rate, 211, 211, 214; - - csecal, 

 335;- -ciliary, 219;- -frontal, 

 412, 412; - - fronto-nasal, 325; 



- globular, 4 13, 413 ; - - head, 



mandib- 



252, 253, 259: 395; 

 ular and maxillary, 404, 404, 406, 

 407, 412, 412 ; - - olfactory, 412, 

 412 ; - - transverse, 209 



procoracoid, 221 



proctodaeum, 65, 118, 119, 120, 169: 

 334: 414 



Proechidna, ova, 418 



pronephric, capsule, 194, 197; - 

 chamber, 196, 197; - - duct, 160, 

 193 ff.: 355 ff.; see also duct, 

 Wolffian; - - tubules, 160, 194, 

 195,' 195, 196: 355 



pronephros, 65, 125, 193 #., 194, 195, 

 196, 199 : 355 ff.; - - degenera- 

 tion of, 197-198, 199 



procestrus, 379 



prosencephalon, 129, 131, 131 : 262, 

 271, 282, 303, 317 



Prototheria, ova, 418 



protovertebra, 51 



proventriculus, 336 



pseudothyroid body, 164 



pubis, 221 



pulmo-cutaneous arch, 184, 184 



pulmo-enteric recess, 351 



pulmonary, arch, 184: 342, 342 ; 



tract, 331-332 



pupil, 146:318,318 



Rabbit, allantois, 425, 431, 434 ff.; 

 amnion, 424 ff., 425, 426; amnion 

 cavity, 428,|431 ; blastodermic vesi- 

 cle, 382, 384, 384, 425 ; chorion,425, 

 426, 431 ; cleavage, 381, 382 ; em- 

 bryonic shield, 393; endoderm, 393; 



