INDEX OF SPECIES. 



229 



Olivella biplicata, Sby 40 



bcetica, Cpr 42 



Omphalius fuscescens, Phil.. 82 



Opalia borealis, Gld 49 



crenatoides, Cpr 49 



Oscilla insculpta, Cpr 52 



Ostrea lurida, Cpr 164 



Virginiana, Lister 164 



Ovulum formicarium, Sby . . 61 

 Pachydesma crassatelloides, 



Conr 189 



Pachypoma gibberosum, 



Chem 87 



Pallochiton lanuginosa, Cpr. 

 Paludinella Newcombiana, 



Hemphill 66 



Parapholas Californica, Conr. 211 



Patula asteriscus, Morse .... 147 



Cronkheitei, Newc . . . 147 



Idahoensis, Newc 149 



solitaria, Say 147 



striatella, Anthony . . . 146 



strigosa, Gld 148 



Pedicularia Californica, 



Newc 58 



Pedipes unisulcata, Cpr 124 



Periploma argentaria, Conr. 204 

 Petricola carditoides, Conr. . 183 

 Pecten aequisulcatus, Cpr. . .166 



hastatus, Sby 167 



hericeus, Gld . . 168 



monotimeris, Conr ... 167 



latiauritus, Conr 167 



Phasianella compta, Gld. . . . 89 

 Pholadidea parva, Try on . . .212 



penita, Conr 212 



Pholas Pacifica, Stearns 209 



Physa Carltonii, Lea 119 



Cooperi, Tryon 119 



costata, Newc 119 



Gabbi, Tryon 119 



heterostropha. Say . . . 118 

 politissima, Tryon ....119 

 Physella Columbiana, Hemp- 

 hill 120 



Pisidium abditum, Hald 176 



compressum, Prime ..176 



Pisidium ultramontanum, 



Prime 176 



Placiphorella velata, Cpr . . . 108 

 Placuanomia macroschisma, 



Desh 163 



Platyodon cancellatus, Conr. 208 

 Polygyra Harfordiana, Cpr . 144 

 Polygyrella polygyrella,Bld. 144 



Pomatia aspersa, Mull 143 



Pomaulax undosus, Wood . . 89 



Pompholyx effusa, Lea 116 



Potamiopsis intermedia, Try- 

 on 63 



Priene Oregonensis, Redf . . 44 

 Prophvsou Hemphilli, Bid. 



. andW. G. B.... ....153 



Psammobia rubro-radiata, 



Nutt 199 



Psephis tantilla, Gld 186 



Pteronotus festivus, Hds .... 22 

 Pupa Arizonensis > Gabb .... 130 



Blaudii, Morse 130 



Californica, Rowell . . 130 

 corpulenta, Morse .... 131 



musc'orum, Linn 131 



Rowelli, Newc 130 



Purpura canaliculata, Duel . . 32 



crispata, Chem 33 



lima, Mart 32 



saxicola, Val 31 



Pyramidella conica, C. B. Ad 54 

 Rauella Californica, Hds. ... 44 

 Rhextaxispunctocselata,Cpr 125 



Rissoa acutilirata, Cpr 65 



Rissoina interfossa, Cpr 65 



Rupellaria lamellifera, Conr. 183 

 Sanguinolaria Nuttalli, Conr. 198 



Saxicava arctica, Linn 208 



Saxidomus aratus, Gld 183 



Nuttalli, Conr 184 



squalidus, Desh 185 



Seal aria Hindsii, Cpr 49 



Indianorum, Cpr 50 



Schizothserus Nuttallii, Conr. 205 



Scurria mitra, Esch 99 



Semele decisa, Conr 190 



pulchra, Sby 190 



