322 



INDEX 



ontogeny, 31 

 oocytes, 311 

 oogones, 311 

 ootheca, 123 

 Opalina, 24 

 operculum, 231 

 optic cup, 174, 179 



lobes, 174, 215, 216, 295 



nerve, 176, 217, 296 



thalamus, see thalamus 

 orbitosphenoid, 200, 263 

 oral cavity, 133 



cirri, 133, 135 

 organ of Bojanus, 67 



of Corti, 302 

 Orthoptera, 124 

 otocyst, 71 

 otolith, 221 



ovarian vessels, 172, 288, 289 

 ovary, 122, 142, 224, 291, 306, 309, 



310 



oviduct, 122, 187, 223, 306 

 ovum, see development. 



palate, 275, 279 

 palatine, 201, 265 

 palatoquadrate, 161, 199 

 pallial cavity, 65 



line, 63 

 pallium, 215 

 palp, 65, 115, 116 

 pancreas, 165, 206, 277 

 parachordals, 160, 199, 260 

 paraglossa, 116 

 Paramecium, 9, 23 

 parasitic Protozoa, 24 

 parasite, 45 

 parasphenoid, 201 

 parathyroid, 290 

 paratoid glands, 205 

 parietal, 261 



parotid gland, 274 



parthenogenesis, 114 



pateUa, 270 



pathetic nerve, see trochlear 



pearls, 63 



pectoral fin, 153, 155, 163 



girdle, 163, 203, 261 

 peduncle (VorticeUa), 13, 14 

 Pelecypoda, 61 



pelvic fin, 153, 155 



girdle, 163, 204, 269 

 penis, 307 

 pereiopod, 94, 96 



pericardia! cavity, 67, 74, 167, 169, 



208, 246, 252, 282 

 pericardial sinus, 104, 120 

 perilymph, see auditory organ 



perineal gland, 256 



periostracum, 63 



peripharyngeal band, 135, 137 



Periplaneta, 114 



perisarc, 40 



peristalsis, 80, 275 



peritoneal cavity, see peritoneum 



peritoneum, 81, 148, 167, 208, 246, 



252, 274, 281 

 Peyer's patches, 277 

 phalanges, 204, 205, 269, 270 

 pharynx, 10, 79, 135, 137, 156, 164, 



275 



Phoronidea, 75 

 phrenic nerve, 299 



vessels, 288, 289 

 phylogeny, 31 



physiology, 17, 19, 35, 72, 80 

 pia mater, 216, 296 



pineal body, 174, 216, 295 



Pisces, 153 



pisiform, 268 



pituitary body, 173, 214, 244, 251, 



290 



placenta, 249, 253 

 placoid scale, 157 

 Planaria, 45 

 plankton, 23, 44, 74 

 planula, 38, 44 

 plasmodioblast, 249 

 Plasmodium, 25 

 Platyhelmia, 45, 128 

 pleopod, 94, 97 

 pleura, 282 

 pleuron, 93 

 pleurobranch, 98 

 pleuroperitoneal cavity, 208 

 pneumogastric, see vagus 

 Podectathenta, 60, 74, 90 

 podical plates, 117 

 podobranch, 98 

 poikilothermic animals, 283 

 polar bodies, 28, 37, 143, 190, 225, 



235, 247, 312 

 polarity, 9, 313 

 Polychaeta, 76 

 Polyzoa, 75 

 Pontobdella, 154 

 pons Varolii, 295 

 Porifera, 30 



portal vein, 172, 213, 289 

 postanal gut, 245, 251 

 posterior commissure, 174, 216, 295 



mesenteric artery, 172, 288 



vena cava, 212, 289 

 postgastrula, 145, 226, 238, 250 

 prawn, 91 



precaval sinus, 172 



vein, 140 



