T^-ORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 207 
Page. 
Onchidiopsis 
Opalia 
Ostrea 
Oudardia 46 
Oxy gyrus 139 
Pachydesma - 41 
Pachymenia 199 
Pachypoma 172 
Pallochiton 193 
Pandora 25 
Panomya 54 
Panope 54 
Paphia 42 
Parapholas 55 
Parvilucina 35 
Patinopecten 19 
Pecten * — 18 
Pedalion 17 
Pedicularia^--- 140 
Pedipes 66 
Periploma ^ 24 
Peronidia 46 
Petaloconchus 151 
Petrasma 9 
Petricola 44 
Petricolaria 44 
Phacoides 35 
Pharcidella 120 
Phasianella 171 
Phenacoptygma 86 
Philbertia 79 
Philine 64 
Philobrya 17 
Pholadidea 55 
Phytia 66 
Piliscus 161 
Pinna 17 
Pirenella 
Pitaria 44 
Placiphorella 196 
Plagioctenium I9 
Platyodon 53 
Plectodon 29 
Pleurobranchus 65 
Pleurodon 14 
Pleurotomella 78 
Plicifusus 92 
Pneumo derma 60 
Pododesmus 21 
PoUnices __ 164,165 
Poniaulax 172 
Page. 
Poromya 27 
Portlandia 12 
Potamides 148 
Progabbia 83 
Promartynia 175 
Propeamusium 20 
Protocardia ^ 40 
Protothaca 42-43 
Provanna 149 
Psammobia 49 
PsepMdia 44 
Pseudamusium 19 
Pseudocliama 33 
Pseudomelatoma 70 
Pseudomurex 113 
Pseudopythina 37 
Pseudorotella 183 
Pteria 17 
Pteropurpura 106 
Pty chair actus 87 
Puncturella 185 
Pupillaria 178 
Purpura 106 
Pyramidella 120 
Pyrgiscus 125 
Pyrgolampros 123 
Pyrulofusus 89 
Retifusus 93 
Retusa 61 
Rexithaerus 48 
Rhodopetala ' 171 
Rhombochiton 193 
Rictaxis 60 
Rictocyma 30 
Ringicardium 39 
Rissoina 160 
Rochefortia-^-j^^^d^:f!:"^:^:^^ 37 
Roperia- gg 
Sabinella 119 
Salassiella 128 
Sanguinolaria 50 
Saxicava 55 
Saxicavella 54 
Saxidomus 42 
Scaphander 62 
Scapharca 16 
Schismope 183 
Schizoplax 189 
Schizopyga 102 
Schizothaerus 52 
Scissilabra^. i82 
