INDEX 



467 



(Amphioxus, pages 1-61; frog, 62-228; chick, 229-367; mammal, 368-454.) 



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, 262, 253, 254 ; sense 



123; velar, 162, 180; 



vertebral, 170, 194: 263, 278 



plectrum, 153, 213, 214 



pleural, cavity, 351; groove, 



310, 361 



pleuro-peritoneal membrane, 352 



plexus, choroid, of iii ventricle, 130, 



133: 306, 307; of iv 



ventricle, 134: 305, 308; pre- 



vertebral, 312; splanchnic, 



312 



plug, yolk, 66, 99, 101, 102, 120 



polar bodies, 6, 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, 346 ; 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 26, 32, 



33, 44 ff. 



pressure, effect upon symmetry, 88 



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, 264; 



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, 268, 

 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 palato-quad- 



rate, 211, 211, 214; csecal, 



335 ; ciliary, 219 ; frontal, 



412, 412; fronto-nasal, 325; 



globular, 413, 413 ; head, 



252, 253, 259: 395; mandib- 



ular and maxillary, 404, 404, 406, 



407, 412, 412; olfactory, 412, 



412 ; transverse, 209 



procoracoid, 221 



proctodseum, 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 J"., 194, 195, 



196, 199 : 355 ff.; degenera- 

 tion of, 197-198, 199 



prooestrus, 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, 361 

 pulmonary, arch, 184: 342, 342 ; 



tract, 331-332 

 pupil, 146:318,318 



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

 amnion, 424 ff., 426, 426; amnion 

 cavity, 428,'431 ; blastodermic vesi- 

 cle, 382, 384, 384, 426 ; chorion,426, 

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

 bryonic shield, 393; endoderm, 393; 



