386 



INDEX OF GENERA. 



Orthonota 12 



Orthotrichum- 95 



Ortyx 303 



Oryzopsis 7S 



Ostracion 177 



Otolithinje 29 



Oxybaphus 75 



Oxyjulus. 330 



Oxyria 94 



Oxytropis GO 



Pachystima 59 



Pagellus 177 



Palafoxia 66 



Paludina 156 



Paudion 152 



Pantodactylus , 102 



Papaver 94 



Paralabrax 80 



Parasalenia 355 



Parmelia 96 



Parnassia 58 



Paronychia 58 



Parula 293 



Paspalnru 79 



Pecten 142 



Pectis 66 



Pectinaria 141 



Pedicularis 72, 94 



Penicellinse 146 



Pentacta 142 



Pentstemon 71 



Periophthalmus 271 



Petalostemon 60 



Peucedanum 62 



Phacelia 73 



Phanerotinus 21 



Pherusa 139 



Phillipsia 24 



Philypnus 180 



Phlox 74 



Phouipara 297 



Phragmoceras 23 



Phrynus Ill 



Phycis 237 



Phyllacanthus 353 



Phyllobates 48 



Phyllodoce 140 



Phyllodactylus 102 



Physa 149 



Physalis 74 



Physaria 58 



Piaya 283 



Picoides 203 



Picus 195,198,201, 284 



Pinus 76 



Platysma 96 



Planorbis 146, 150 



Plantngo 70 



Platanthera 76 



Platyceras 18 



Platyglossns 205 



Pleuroeera 274, 279, 308 



Pleurogyne 74 



Plocadium 96 



Pleurotomaria 19 



Poa 79, 95 



Podophora 354 



Pogonatum 95 



Pogonias 29 



Polemonium 73 



Polipicns 196 



Pollachius 231 



Polygonum 75, 95 



Polypodium 80 



Polytrichum 95 



Pomacanthodes 162 



Pomacentrinfe 214 



Pomacentrus 214 



Pornataprion 216 



Pomatiopsis 148 



Populus 76 



Porcellia 18 



Posidonomya 10 



Potentilla 61, 94 



Priacanthus 177, 182, 332 



Priapulus 141 



Primula 70 



Prionotus 180 



Pristis 179 



Prochilus 205 



Producta 4 



Progne 295 



Promicropterus 164 



Pronotogramnius 81 



Prunus 61 



Psammechinus 356 



Psoralea 60 



Pterophryue 90 



Pterospora 70 



Pulsatilla 56 



Pyranga 296 



Pyrola 70, 94 



Pyxicephalus 51 



Quercus 76 



Quiscalus 298 



Racomitrium 95 



Ranunculus 56, 94 



Remora 88 



Rhaebo 49 



Rhadinasea 100 



Rhamphoberyx 87 



Rhinanthus 72 



Rb inonemus 241 



Rhipidoglossa 34 



Rhodvmenia 69 



