Subject Index 



849 



Opercular, 126 

 Operculum, 122, 126, 442 

 Ophidia, 486 (see also Serpentes) 

 Ophthalmic nerve, 160, 161, 164 

 Opisthocoelous, 456 

 Opisthocoelus centrum, 106 

 Opisthocomus, 410, 546 

 Opisthonephros, 85 

 Opisthoti'c, 125 

 Opposable thumb, 804 

 Opossum, 61, 733, 783 



Australian, 735 



Virginia, 731 

 Optic chiasma, 162, 202 



cup, 117, 200, 273 



lobes, 150, 534, 535, 536, 537 



nerve, 150, 162, 163, 201, 202, 203,204, 

 273, 711, 713 



stalk, 117, 149, 163, 200, 202, 273 



vesicles, 6, 200 

 Ora serrata, 203 

 Oral epithelium, 37, 41, 195, 196 



membrane, 274 

 Orangutan, 771, 772 

 Orbicularis oculi muscles, 98 



oris muscles, 98 

 Orbit, 117, 122, 125, 176, 680 

 Orbital cavity, 602 



glands, 636 

 Orbitosphenoids, 124 

 Orders, 390 



Organ(s) of Corti, 196, 210, 477, 534, 690, 

 691 



definition of, 301, 302 



of Jacobson, 475, 532, 678 



lateral-line, 164, 165, 166 



of Lorenzini, 165 



obsolete, 299 



position of, 374-380 



visceral, 285 

 Organogenesis, 266—299 



in relation to yolk, 288-291 

 Origin, muscle, 95 



of species, 345 

 Orioles, 553 

 Ornithodelphia, 729 

 Ornithorhynchus, 236, 726, 727, 733 (see 



also Duckbill) 

 Orthogenesis, 796 

 Orycteropus, 745, 746 

 Os clitoridis, 661 

 Ossa suprasternalia, 132 

 Ossicles, Weberian, 433, 434 

 Osteichthves, 420 

 Osteoblast, 102, 103, 284, 285, 325 

 Osteoclasts, 327 

 Osteology, 343 

 Ostium, 87 



tubae abdominale, 80, 646 

 Ostracoderm(i), 415, 416, 442 

 Ostrich (es), 234, 530, 538, 544, 545 

 Otariidae, 747, 749 

 Otic capsule, 116, 125, 144, 209, 692 



ganglion, 176, 178, 179, 183 



sac, 144, 207-210, 689 



Otoconia, 209, 210 

 Otoliths, 209, 210 

 Otter, 747 

 Ovarian arteries, 68 



follicles, 232 

 Ovary (ies), 79, 87, 88, 2 Hi, 231, 233, 236, 

 237, 242, 282 



function of, 645 



of mammals, 643-650 

 Overspecialization, 796 

 Oviduct(s), 80, 87, 88, 237-239, 241, 283 

 Oviparity, 238, 241, 244, 245 

 Oviparous mammals, 650 

 Ovis, 757 



aries, 756 

 Ovum(a), 231, 232, 233-238, 291 

 Owl(s), 529, 535, 551, 553 

 Ox, 47 



Pacini, corpuscles of, 193, 195 

 Paedogenesis, 445 

 Pain, 193, 195 



Paired appendages, 128-134, 172, 173, 

 383, 447, 467, 468 



fins, 416 

 Palaeencephalic, 713 

 Palaeencephalon, 704, 720 

 Palaeognathae, 543, 544 

 Palate, 14, 199 



secondary, 561, 564, 602, 611 



soft, 611 

 Palatine bone, 125, 199 



nerve, 160, 161, 166 

 Palato-pterygo-quadrate, 118, 125, 127, 446 

 Paleolithic drawing, 806 

 Paleontology, 342, 789, 790 

 Paleozoic, 789 

 Palingenetic structures, 299 

 Pallium, 145, 148, 419, 448, 479, 480, 481, 



536, 704 

 Palm, 133 



skin of, 577 

 Palpebrae, 685 (see also Eyelids) 

 Pancreas, 14, 29-35, 34, 183, 185, 215, 

 216, 530 



Aselli, 633 



development of, 31, 32, 258, 276 



function, 35 

 Pancreatic cavities, 31 



duct, 14 



islands (islands of Langerhans), 32, 34, 

 215, 216 

 Panda, 747, 748 

 Pander, nucleus of, 236 

 Pangolin (s), 101, 745, 746 

 Panniculus carnosus muscles, 100 

 Panther, 747 

 Pantotheria, 773 

 Papilla(e), 39, 40, 41, 42, 210, 669, 670 



acustica lagenae, 477 



basilaris, 477 



dermal, 670 



filiform, 670 



foliate. 671 



