INDEX. 



667 



Os petrosum, 021. 



premaxillare, 622. 



pterygoideum, 619* 



pubis, 639. 



squamosum, 621. 



temporale, 620. 



tympanicum. 621. 

 Osseous tissue, 541. 

 Ossification, endochondral, 616. 



perichondral, 616. 



of vertebras, 599. 

 Osteoclasts, 313. 



Ostium abdominale tuba3, 369. 



Otolith, 492. 



Outer germ-layer see Germ -layer. 



Ovarium see Ovary. 



Ovary, 374. 



Oviduct of the Hen, 17. 



- of Man. 395. 

 Ovists, 24. 

 Ovum see Egg. 



P. 



Palatal fissure, 515, 623. 



plate, 515, 611. 



velum, primitive, 2?3, 437. 

 Palate, 515, 611,622. 

 Palato-quadratum. 609, 624. 

 Pancivas, 324, 332. 



Panders nucleus, 16. 



Papilla of milk-glands, 530, 531. 



Papillary l.odirs of skin, 521. 



muscles, 563. 

 Parablast, 180, 189. 

 Parablast-nuclei. 64. 

 Paral. last-theory. 189. 

 Paruchordal cartilages, 606. 

 I'aradiilyniis, 388. 

 Parauuclein, 26. 



Parietal cavity, 566. 



- elevation, 281, 424, 431. 



- eye, 435. 



- lamella, 171. 



lobes, 443. 



- prominence, 284, 421, 431. 



zone of blastoderm, 167. 

 Paroophoron, 394. 

 Parovariurn, 394. 



Pars coracoidca, 638. 



- membranacea of heart, 564. 

 Parthenogenetic eggs, 34, 36. 

 Patella, 61 1. 



Pectcn of Bird's eye, 483. 



Pectoral girdle, 638. 



Pedunculus cerebelli ad pontem, 429. 



cerebri, 550. 



- flocculi, 429. 

 Pelvic girdle, 638. 

 Penis, -102. 



Pericardia! cavity, 566. 

 Pericardium, 543*, 566. 

 Perichondral ossification, 616. 

 Perilymphatic spaces, 501. 

 Perineum, 400. 



Perivisceral cavity see Body-cavity. 

 Pes hippocampi. 441. 

 Pfl tiger's egg-tubes, 376. 

 Pharyngeal membrane, 594, 283. 

 Pia mater, 429. 



Pial sheath of optic nerve, 486. 

 Pineal body, 432. 



gland, 432. 



organ, 432. 



process, 432. 

 Pituitary body, 436. 

 Placenta discoidea, 236. 



fcetalis, 234, 2.V.). 



of Mammals, 232. 



- of Man, 258. 



praevia, 259. 



- titerina, 233, 258. 



zonaria, 236. 



Placental circulation, 263-8, 553. 

 Plane of division (egg), 56. 

 Pleuro-pericardial cavity, 566. 



fold, 56;>. 



Plexus choroidcus ant., 431. 



lateralis, 414. 



- post, 429. 



Plica semilunaris, 487. 

 Polar cells, :52. 



corpuscles see Polar cells and 



Centrosomes. 



differentiation of egg, 11, 35. 



spindle, 43. 



Pole of egg, animal, 11. 



vegetative, 11. 

 Polyphyodont, 309. 

 Polyspermia, I (. 

 Pons Varolii, 429. 

 Pontal flexure, 423. 

 Portal circulation, 583. 



vein, 584, 586. 

 Post-anal gut. 290, 292. 

 Posterior nares. 611. 

 Preformatiou-theory, 23. 

 Prehepaticus (Vcrlefor), 326,330, 567 

 Primitive ova, 374. 



- groove, 121, 133, 135, 282 see also 



Blastopore. 



mouth see Blastopore and Primi- 



tive groove. 



organs, 86, 187. 



segment plates, 165. 



segments, 112, 161. 



segments of Amphibia, Birds, 



Mammals, Reptiles, 112, Hi.1. 



segments of Amphioxus, 112, 161 



segments of the head, 351. 



