IXDKX 



Primitive body cavity (coelom), 46, 60, 65, 80, 

 81, 96, 98, 104 



axis (head process), 74, 76, 77, 82, 95 



coordinating mechanism, 474 



folds, 74, 75, 77, 102 



groove, 74, 75, 77, 79, 94, 102, 103, no 



gut (see also Archenteron) , 285, 340 



knot (Hensen's), 74, 75, 77, 93, 97 



pericardial cavity, 196, 280, 341 



Pit, 74, 75, 77 



plate, 75, 77 



segments, 46, 79, 80, 262, 268 



streak, 74, 75, 76,77,78,82,91,92,93,94, 



102, 103 



Primordial cranium, 157 

 Proamnion, 77, 79, 572 

 Processus neuroporicus, 424 



reticularis, 481, 486 



vaginalis peritonei, 390 

 Proctodaeum, 58 



Production of duplicate (polysomatous) mon- 

 sters, 621 



of monsters in single embryos, 622 

 Progamous determination of sex, 382 

 Projection fields, 528 

 Pronephric duct, 354, 355 

 Pronephros, the, 354 



pronephric duct of, 354 

 tubules of, 355 



significance of, 355 

 Pro-oestrus, 25 

 Prosencephalon (fore-brain), 424, 427, 437 



diencephalon, 425, 437 



peripheral neurones of, 471 



telencephalon, 425, 437 

 Prosopopagus parasiticus, 608 

 Prostate gland, 372 

 Psalterium, see Fornix commissure 

 Pterygoid hamulus, 159 



process, 159, 161 

 Pubis, the, 171 

 Pulmonary artery, 204, 212 

 Pulp of teeth, 294, 295 

 Pulpy nuclei, 147 

 Pulvinar thalami, 503 

 Purkinje cells, 497, 499 

 Pygopagus, 604 



Pyramids (see also Tracts, pyramidal], 442, 491, 

 493, 494 



Quadrigemina, anterior, see Anterior corpora 



quadrigemina 

 posterior, see Posterior corpora quadrigemina 



Rabbit, formation of amnion of, 572 

 Rabl, concerning origin of vitreous, 545 



concerning sex cells, 374 

 Rachischisis, 282, 613, 615 



cystica, 613 

 Radius, 168 

 Ramus, 164 



communicans, gray, 462 



white, 457, 462 

 Raphc (of epichordal segmental brain), 485 



(of scrotum), 396 

 Rathke's pocket, 288 



pouch, 501 

 Receptors, 418, 421, 427, 430, 432 



visual, 471, 475 

 Recessus postopticus, 424, 501 



praeopticus, 424, 501 

 Recklinghausen, von, concerning deficient 



growth of blastoderm, 615 

 Rectum, the, 310, 370 

 Red blood cells, 239 



Reduction of chromosomes (see also Matura- 

 tion), 11, 380 

 Reflex arc, 476 



three-neurone, 419 



two-neurone, 418 

 Regnier de Graaf, XIII 

 Reichert, XIV 

 Rejuvenescence theory, 33 

 Renal corpuscle, 367 



papillae, 367 



pelvis, primitive, 361 



pyramids, 367 



tubules, convoluted, 363 



straight, 361 

 Respiratory system, the, 330 



anomalies of, 338 



larynx, 331 



lungs, 334 



trachea, 333 



Restiform body, 436, 491 

 Rete cords, 374 



ovarii, 377 



testis, 381, 382 

 Retention cysts, 618 



Reticular formation, 435, 441, 485 to 488 

 gray, 486 

 white, 486 



tissue, origin of fibers of, 134 

 Retina, 424, 471, 475, 540 



amacrine cells of, 542 



area centralis, 542 



bipolar cells of, 475, 543 



