INDEX. 



667 



Os petrosum, 621. 

 premaxillare, 622. 



- pterygoideum, 619, 



pubis, 639. 



squamosum, 621. 



temporale, 620. 



tympanicum. 621. 

 Osseous tissue, 541. 

 Ossification, endochondral, 616. 



perichondral, 616. 



of vertebrae, 599. 

 Osteoclasts, 313. 



Ostium abdominale tubas, 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. 283, 437. 

 Palate, 515, 611, 622. 

 Palato-quadratum, 609, 624. 

 Pancreas, 324, 332. 



Pander's nucleus, 16. 



Papilla of milk-glands, 530, 531. 



Papillary bodies of skin, 521. 



muscles, 563. 

 Parablast, 180, 189. 

 Parablast-nuclei, 64. 

 Parablast-theory, 189. 

 Parachordal cartilages, 606. 

 Paradidymis, 388. 

 Paranuclein, 26. 

 Parietal cavity, 566. 



- elevation, 284, 424, 431. 



eye, 435. 



- lamella, 174. 



lobes, 443. 



- prominence, 284, 424, 431. 



zone of blastoderm, 167. 

 Parob'phoron, 394. 

 Parovarium, 394. 



Pars coracoidea, 638. 



membranacea of heart, 564. 

 Parthenogenetic eggs, 34, 36. 

 Patella, 644. 



Pecten of Bird's eye, 483. 



Pectoral girdle, 638. 



Pedunculus cerebelii adpontem, 429. 



cerebri, 550. 



flocculi, 429. 

 Pelvic girdle, 638. 

 Penis, 402. 



Pericardial cavity, 566. 

 Pericardium, 543, 566. 

 Perichondral ossification, 616. 

 Perilymphatic spaces, 501. 

 Perineum, 400. 



Perivisceral cavity see Body-cavity. 

 Pes hippocampi, 441. 

 Pfliiger'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, 259. 



of Mammals, 232. 



of Man, 258. 



prsevia, 259. 



- uterina, 233, 258. 



zonaria, 236. 



Placental circulation, 263-8, 553. 

 Plane of division (egg), 56. 

 Pleuro-pericardial cavity, 566. 



fold, 568. 



Plexus choroideus ant., 431. 



lateralis, 444. 



- post., 429. 



Plica semilunaris, 487. 

 Polar cells, 32. 



corpuscles see Polar cells and 



Centrosomes. 



differentiation of egg, 11, 35. 



spindle, 43. 



Pole of egg, animal, 11. 



vegetative, 11. 

 Polyphyodont, 309. 

 Polyspermia, 44. 

 Pons Varolii, 429. 

 Pontal flexure, 423. 

 Portal circulation, 583. 



vein, 584, 586. 

 Post-anal gut, 290, 292. 

 Posterior nares, 611. 

 Preformation-theory, 23. 

 Prehepaticus ( Vcrleber), 326, 330, 567. 

 Primitive ova, 374. 



groove, 121,133, 135, 282geealso 



Blastopore. 



mouth see Blastopore and Primi- 



tive groove. 



organs, 86, 187. 



segment plates, 165. 



- segments, 112, 161. 



segments of Amphibia, Birds, 



Mammals, Keptiles, 112, 165. 



segments of Amphioxus, 112, 161 



segments of the head, 351. 



