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 vertebrse, 599. 

 Osteoclasts, 313. 



Ostium abdominale tubse, 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, 382. 

 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. 

 Paroophoron, 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 cerebelli ad pontem, 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. 

 Pfluger'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, 437. 

 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, 282—seealsa 



Blastopore. . 



— mouth — see Blastopore and Primi- 



tive groove. 



— organs, 86, 187. 



— segment plates, 165. 



— segments, 112, 161. 



— segments of Amphibia, Birds, 



Mammals, Reptiles, 112, 165. 



— segments of Amphioxus, 112, 161 



— segments of the head, 351. 



