482 



INDEX. 



Optic lobes, chick, 121 



Optic nerves, chick, 133, 146 



Optic cup, 134 



Optic chiasma, chick, 147 ; mam- 

 malia, 372 



Optic thalami of mammalia, 373 



Orbitosphenoid, 246 



Orbitosphenoidal region, chick, 

 240 



Organ of Corti, mammalia, 395 



Organ of Jacohson, mammalia, 



399 



Orycteropus, placenta of, 358 



Osmic acid, how to use, 427 



Osseous labyrinth, chick, 158 



Otic vesicle, chick, 157 



Outer layer, of blastodermic vesi- 

 cle, 314 



Ova, primordial, of chick, 221 



Ovarian follicle: of hen, 12 15 ; 

 mammal, 309 



Ovarian ovum : of hen, 11 15 ; 

 of mammals, 309 



Ovary : of adult hen, 11; of 

 chick, 222 ; of mammals, 

 309 ; follicles of, 309 ; corpus 

 , luteum of, 311 



Oviduct of adult hen, 15 ; of 

 chick, 224 



Oviparous animals, 308 



Ovum : of birds and mammals 

 compared, 307 ; of mammal 

 in follicle, 309 ; membranes of, 

 310; maturation and impreg- 

 nation of, 310 312; polar 

 bodies of, 311; segmentation 

 of, 312 314; blastopore of 

 (Beneden), 314 



Palate, mammalia, 420, 421 

 Palatine bones, chick, 246 

 Pancreas : of chick, 181 ; mam- 

 malia, 419 

 Pander, nucleus of, 7. 

 Parachordals, chick, 235 238 

 Paraffin, 432434 

 Parepididymis of cock, 224 

 Parietal bones of chick, 246 



Parieto-occipital fissure of cere- 

 brum of man and apes, 38; 



Parkee on the fowl's skull, 245 



Paroophoron of hen, 224 



Pecten, chick, 147 



Pectoral girdle, chick, 234; mam- 

 malia, 405 



Pelvic gu'dle, chick, 234 ; mam- 

 malia, 405 



Penis, mammalia, 417 



Pericardial cavity, chick, develop- 

 ment of, 264 269 ; of rabbit, 

 331; mammalia, 406 



Perilymph, mammalia, 396 



Periotic capsules, chick, 237 



Peritoneal covering of heart of 

 chick, 88; cavity, mammalia, 

 406 



Peritoneum, mammalia, 419 420 



Pflugeb, egg tubes, 222 



Phalanges, chick, 234 



Pharynx, mammalia, 418 



Picric acid, how to use, 425 



Picro-carmine, to make and use, 



431 

 Pig, placenta, histology of, 360 

 Pineal glands, chick, 1 1 7 1 19 ; 



of mammalia and birds, 373 



376 



Pituitary body : chick, 119 121; 

 rabbit, 334; of birds, 372; 

 mammalia, 372, 420 



Pituitary space, chick, 240 



Placenta : 342 ; discoidal, deci- 

 duate, type of, 353, 354; meta- 

 discoidal, type of, 354358 ; 

 decidua of, 356 ; choiiou lasve 

 of, 356 358; chorion frondo- 

 sum of, 356 358 ; comparison 

 of, 358; zonary type of, 358; 

 diffuse form, 359 ; polycotyle- 

 donary form, 359 ; histology of, 

 359363 ; evolution of, 364 ; 

 of sloth, 360. 



Pleural cavity, chick, development 

 of, 264 269 ; mammalia, 406 



Pleuroperitoneal space of chick, 

 28 33, 84; formation of, 40, 

 41, 68 



Pneumogastric nerve {see Tenth 

 nerve) 



