244 



INDEX 



Palundina virens (119) 

 Paraspira 82, 86 

 Parmacellina (36) 



vitrinseformis 36 

 Parypha microcephala 187 

 Patella (107) 



lacustris 107, 108 

 Patula 49 



asteriscus (51) 



cronkhitei (50) 



occidentalis 49 



pauper 50, 51 



solitaria (49) 



striatella 50 



Patulastra pugetensis (43) 

 Periophthalmus 115 

 Petasia (39) 



fabricii (41) 



fulva 40 



trochiformis (40) 

 Phenacarion foliolatus (47) 



hemphilli (47) 

 Phenacolimax (36) 

 Phymesoda dubia (141) 



idahoensis (141) A 



scutellata 141 



virginica 141 



Physa ii, 63, (81), 84, 99, (100), XOI, 

 102, (104), 105, 107 



albofilata (102) 



ampullacea 103 



ancillaria 102 



bullata (103) 



columnaris 99, IOI 



contorta 99 



costata 100, 101 



crassa (102) 



elongata (106) 



elongatina (107) 



fontinalis ii, 99, (lO2), 105 



fragilis (101) 



glabra (106) 



globosa 99 



guildingii 99, 100 



gyrina 101 



heterostropha zoi, 103 



hildrethiana 102 



hordeacea soj, 107 



hypnorum (106) 



Physa lata (101) 

 lordi 102, 103 

 microstoma 99 

 obesa (102) 

 oleacea (102) 

 parkeri (102), 103 

 philippii (101) 

 plicata (101) 

 polaris 107 

 primeana (101) 

 propinqua 103 

 turrita (106) 

 vinosa 102 



Physastra (61), 62, 64 

 vestita 61, 64 



Physella (99), 100 



Physidae 99, 101 



Physodon (99), 100 



Physopsis 100, IOI 



Phyza (99), (104) 



Pierosoma 81, 85 

 binneyi 87 

 corpulentus 87, 88 

 trivolvis 88 



Pisidium 3, 141 



abditum (142), (143) 

 abyssomus (143) 

 abyssorum (143) 

 aequilaterale (141) 

 arcticum (144) 

 boreale (144) 

 compressum (142) 

 glaciale (144) 

 henslowianum (145) 

 idahoense (141) 

 nivale (144) 

 occidentale (143) 

 randolphi (145) 

 rotundatum (143) 

 scutellatum (141) 

 sibiricum (144) 

 steenbuchii (143) 

 ultramontanum (144) 

 variabile (142) 

 ventricosum (143) 

 virginicum (141) 



Planaria (83) 



Planella (120) 



Planogyra 51 



