INDEX 



377 



Osphradium, 148 



Ossicles, auditory, 217, 218; Star- 

 fish, 75 



Osteoblasts, 174 



Ostia, Bee, 130; Crayfish, 106; 

 Grasshopper, 120 



Ova (see Eggs) 



Ovaries, Bee, 131 ; Clam, 146 ; Cray- 

 fish, 109; Earthworm, 93; Frog, 

 184, 205 ; Grasshopper, 121 ; Hen, 

 232 ; Hydra, 65 (see Gonads) 



Oviducts, Bee, 131 ; Hen, 232 ; Cray- 

 fish, 109 ; Earthworm, 93 ; Frog, 

 184, 205 ; Grasshopper, 121 ; Mam- 

 mal, 236 



Oviparous Mammals, 160, 236 



Ovipositor, 117 



Ovisac, 93 



Oxyhemoglobin, 191 



Oysters, 139 



Palatine bones, 176 



Palps, labial, 143, 145 



Pancreas, 183, 186, 208 



Paramecium, description, 39-47 ; lab- 

 oratory, 263 ; life processes, 42-46 ; 

 structure, 39-42 



Paramecium aurelia, 45, 46 



Parasite, 63 



Parasitism vs. symbiosis, 63 



Parasphenoid bones, 176 



Parthenogonidia, 37 



Pecten, 127 



Pectoral girdle, 179 



Pedal ganglion, 147 



Pedicellariae, 75 



Pellicle, Euglena, 29; Paramecium, 

 40 ; Vorticella, 48 



Pelmatohydra, 59 



Pelvic girdle, 180, 182 



Pelvic veins, Frog, 195 



Pennaria, 141 



Pentadactyl limbs, 153, 166, 179, 180 



Pepsin, 188 



Peptones, 188 



Peranema, 35 



Pericardial sinus, Bee, 130 ; Crayfish, 

 105 ; Grasshopper, 120 



Pericardium. Clam, 143, 144; Cray- 

 fish, 105 ; Frog, 183, 194 

 Perihemal system, 78 



Perilymph, 217 



Perimysium, 170 



Perineurium, 214 



Periosteum, 174 



Perisarc, 68, 69 



Peristalsis, Earthworm, 89; Frog, 



188 

 Peristome, Paramecium, 39, 40 ; Vor- 

 ticella, 48 

 Peritoneum, 183 

 Petromyzon, 154 

 Phalanges, 180 

 Pharynx, Earthworm, 85, 87 ; Frog 



embryo, 227 

 Photoreceptor cells, 97 

 Photosynthesis, 9, 10, 11, 31, 32, 36, 

 63; vs. respiration, 31 (see Nutri- 

 tion, holophytic) 



Phototropism, 32 

 Phylum, 27 



Pia mater, 211 



Pig, fetal, laboratory, 315 



Pincer, 102 



Pineal body, 209 



Pisces, 155 



Pituitary body, 207, 209 



Placenta, 237 



Plants, description, 10-12; labora- 

 tory, 247, 251, 253 



Planula, Obelia, 73 



Plasma, blood, 88, 192 



Plasma membrane, 6 



Plastids, 5 



Pleura, 100 



Pleurobranchiae, 107 



Pleurococcus, description, 11 ; labo- 

 ratory, 251 



Plexus, brachial, 213; sciatic, 214; 

 solar, 215; urogenital, 215 



Poikilothermal, 159 



Poison glands, Bee, 128 ; Frog, 168 



Pollen, as food, 136 



Pollen baskets, 127 



Pollen brush, 126 



Pollen spur, 126 



Polychaeta, 83 



Polymorphism, 136 



Polyp, 68, 69, 72 



Porcupine-fish, 157 



Portal systems, 195 



Premaxillae bones, 176 

 Premolar teeth, 178 

 Primates, 163 



