INDEX. 



667 



Os petrosum, 621. 



premaxillare, 622. 

 pterygoideum, 619. 

 pubi's^639. 



- squamosum, 621. 



temporale, 620. 



- tympanicum. 621. 

 Osseous tissue, 541. 

 Ossification, endochondral, 616. 



- perichondral, 616. 



of vertebras, 599. 

 Osteoclasts, 313. 



Ostium abdominale tubte, 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 S3, 437. 

 Palate, 515, 611, 622. 

 Palato-quaclratum, 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. 

 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 cerebelJi adpontem. 429. 



- cerebri, 550. 



flocculi, 429. 

 Pelvic girdle, 63S. 

 Penis, 402. 



I 



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. 



foetalis, 234, 259. 



- of Mammals, 232. 



- of Man, 258. 



- praavia, 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, 1 1 . 



- 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. 61 1 . 

 Preformation-theory, 23. 

 Prehepaticus (Vorleber^ 326.330, 567. 

 Primitive ova, 374. 



- groove, 121, 133, 135, 282 seealso 



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. 



