INDEX 



Paludina decisa (125) 



emarginata (118) 



grana (118) 



hyalina (91) 



litnosa (117) 



lustrica I2O 



nuclea (119) 



obtusa (118) 



porata (117) 



seminalis (119) 



virens (119) 

 Paraspira 82, 86 

 Parmacellina (36) 



vitrinaeforrais 36 

 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) 



scutellata 141 



virginica 141 



Physa ii, 63, (8l), 84, pp, (100), IOX, 

 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 u, 99, (102), 105 



Physa fragilis (101) 



glabra (106) 



globosa 99 



guildingii 99, 100 



gyrina IOI 



heterostropha /<?/, 103 



hildrethiana 102 



hordeacea /oj, 107 



hypnorum (106) 



lata (101) 



lordi/0.?, 103 



microstoma 99 



obesa (102) 



oleacea (102) 



parkeri (102), 103 



philippii (loi) 



plicata (101) 



polaris 107 



primeana (101) 



propinqua foj 



turrita (106) 



vinosa 102 

 Physastra (61), 62, 64 



vestita 61, 64 

 Physella (99), 100 

 Physidae pp, IOI 

 Physodon (99), IOO 

 Physopsis loo, 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) 



