INDEX. 



Optic nerve, 94, 136 



Orang-utan, 124 



Orbit, 56 



Organ of Bojanus, 249, 260 



Organ of Corti, 100 



Organs, 318, 320 



Orioles, 84 



Ornithorhynclius, 102 



Ornithurse, 77 



Orthoceratitis, 267 



Ortboptera, 181, 218 



Oscines, 82, 83 



Ossification, 131 



Ostriches, 78 



Ostium, 314, 316 



Otoliths, 16, 138 



Otter, 121 



Ovary, 12, 42 



Oviduct, 42 



Ovipositor, 170 



Owls, 81 



Ox-warble, 223 



Oyster, dissection of, 251 



Oysters, 260 



Palate, 93 



Painted-beauty, 204 



Palatine, 131 



Palpi, 173 



Pancreas, 142 



Pangolin, 107 



Panther, 121 



Parotid gland, 92 



Paper-nautilus, 267 



Paper-wasps, 191 



Paradisea, 83 



Parapodia, 240 



Parasita, 198 



Parrots, 82 



Passeres, 82 



Paste-eels, 245 



Pearl-oysters, 260 



Pearls, 261 



Pearly nautilus, 267 



Peccary, 117 



Pecten, 261 



Pectoral girdle, 18, 132, 133 



Pedata, 293 



Pelvic girdle, 45, 132 



Penguin, 78 



Pen of squid, 256 

 Pennaria, 299 

 Pentacrinus, 294 

 Pentacta, 292 

 Pericardial cavity, 13 

 Perisarc, 299 

 Peristome, 282 

 Peritoneum, 11, 142 

 Peritoneal cavity, 101 

 Perissodactyls, 116 

 Permanent dentition, 100 

 Perch, 29 

 Perching birds, 82 

 Petromyzon, 151 

 Phalanger, 104 

 Phalanges, 134 

 Phalangida, 232 

 Phalangium, 232 

 Pharynx, 11, 141 

 Pharyngognathi, 29 

 Pheasant, 78 

 Phoca, 122 

 Phylloxera, 197 

 Physalia, 308 

 Physiology, 324 

 Physostomi, 24 

 Pickerel, 26 



Picrosulphuric acid, 344 

 Pig, 117 

 Pigeons, 81 

 Pike, 26 

 Pill-bug, 168 

 Pipa, 53 

 Pipe-fish, 32 

 Pinnipedia, 120 

 Pin-worms, 245 

 Pisces, 33 

 Pituitary body, 44 

 Placenta, 105 

 Placentalia, 105 

 Plaooid scales, 17 

 Placophora, 273 

 Plantigrade, 121 

 Plant-lice, 197 

 Plants, 337 

 Plasma, 149 

 Plastron, 56 

 Plathelniintb.es, 242 

 Plectognathi, 31 

 Pleisosaurs, 70 



