INDEX 



331 



Oocyte (syn. ovocyte), 33, 44, 45, 47, 48, 

 52, 59,61.(5.?, 64,66 



Oogenesis, 33, 57 



Oogonia, 33, 44, 44, 57 



Opercular chamber (see Chamber, bran- 

 chial) 



Operculum (syn. opercular fold), 21, 22, 

 23. 23, 25, 26, 29, 30, 131, 157, 

 178, 196, 197, 237, 258, 259 



Operculum of ear (see under Ear) 



Oppenheimer, J., 8 



Optic chiasma, 70, 141, 162, 163, 164, 



165, 166, 168, ni, 190 



Optic cup, 140, 150, 152, 158, 164, 171, 



173 

 Optic lobe (syn. corpora bigemina), 163, 



166, 190, 259 

 Optic plate (see under Plate) 

 Optic protuberance, 130 



Optic recess, 135, 141, 762. 163, 164, 168, 



190 

 Optic stalk, 140, 142, 166, 770 

 Optic vesicle (syn. opticoel), 27, 705, 130, 



131, 140, 142, 143, 144, 164, 



766, 770, 170,251 

 Opticoel (see Optic vesicle) 

 Oral evagination, 135, 142, 143, 144, 162, 



164 

 Oral membrane (see Plate, oral) 

 Oral plate (see under Plate) 

 Orbital bones, 216 

 Orbital cavity (see under Cavity) 

 Orbito-nasal foramen, 275 

 Organ(s) (see under specific organ) 

 anlagen of, 702, 729 

 formation of (syn. organogeny), 3, 15, 



72^ 

 of Jacobson, 179, 750 

 Organism, 1, 3 



Organogeny (see Organ formation) 

 Osteoblasts, 213 

 Ostium (syn. infundibulum of the oviduct, 



ostium tuba), 18, 49, 53, 54, 56, 



226 

 Ostium tuba (see Ostium) 

 Otic capsule (syn. auditory capsule), 178, 



7S2, 275. 216, 245,252 

 Otic placode (see Auditory placode) 

 Otic vesicle (syn. auditory vesicle), 144, 



146, 150, 152, 158, 164, 177, 



181, 190, 237 



Ovary, 75, 43, 44, 48, 59 

 lobes of, 48 



Oviduct, 18, 48, 49, 50, 51, 53, 54, 55, 56, 

 220, 226 

 infundibulum of (see Ostium) 

 rudimentary male (see Miillerian duct) 

 vestigial (see Miillerian duct) 



Oviposition, 75 



Ovist (see also Preformationism), 5, 12 



Ovocyte (see Oocyte) 



Ovulation, ^5, 5 1 , 52, 53, 56, 67, 65, 70 



Ovum, mature (see Egg) 



Oxygen, 25, 156 



Pachytene, 34, 57 



Palatine bones, 216 



Palatoquadrate bone (syn. pterygoquad- 



rate), 275, 216, 249 

 Pancreas, 98, 204, 205, 208, 259 

 Pancreatic duct (see under Duct) 

 Pander, 14 



Papillae, horny rasping, 157 

 Parachordal bones, 214, 249 

 Parachordal plate (see under Plate) 

 Paraphysis, 164 

 Parasphenoid bones, 216 

 Parathyroid gland (syn. pseudo-thyroid 



gland), 199, 208 

 Parmenter, 8 

 Pars distalis, 141 

 Pars intermedia, 141 

 Pars nervosa (syn. posterior pituitary 



gland), 70, 141 

 Pars tuberalis, 141 

 Parthenogenesis, 5 

 Pasteels, J.. 8, 98,777. 725 

 Path, copulation, 78, 50, 57, 82, 87, 88 

 penetration, 78, 79, 80, 81, 88 

 pigment, 79 

 Patten, B. M., 8, 99 

 Penners, A., 8 



Pericardial cavity (see under Cavity) 

 Pericardium, 145, 150, 151, 233, 237, 



252 

 Perichondrium, 212 

 Perilymph space of the ear (see under 



Ear) 

 Peritoneal cavity (see Coelom) 

 Peritoneal epithelium (see Peritoneum) 

 Peritoneal funnels (see under Funnels) 



