INDEX 



I6 5 



Paludina decisa (125) 

 emarginata (118) 

 grana (118) 

 hyalina (91) 

 limosa (117) 

 lustrica 120 

 nuclea (119) 

 obtusa (118) 

 porata (117) 

 seminalis (119) 

 virens (119) 

 Paraspira 82, 86 

 Parmacellina (36) 



vitrinseformis 36 

 Patella (107) 



lacustris 107, 108 

 Patula 49 



asteriscus (51) 

 cronkhitei (50) 

 occidentalis 49 

 pauper jo, 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) 

 idahoe'nsis (141) 

 scutellata 141 

 virginica 141 

 Physa 11, 63, (81), 84, 99, (100), ioi, 

 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 11, 99, (102), 105 



Physa fragi lis (101) 

 glabra (106) 

 globosa 99 

 guildingii 99, 100 

 gyrina 101 



heterostropha 101, 103 

 hildrethiana 102 

 hordeacea 103, 107 

 hypnorum (106) 

 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), ioo 

 Physopsis 100, 101 

 Phyza (99), (104) 

 Pierosoma 81, 85 

 binneyi 87 

 corpulentus 87, 88 

 trivolvis 88 

 Pisidium 3, 141 



abditum (142), (143) 

 abyssomus (143) 

 abyssorum (143) 

 sequilaterale (141) 

 arcticum (144) 

 boreale (144) 

 compressum (142) 

 glaciale (144) 

 henslowianum (145) 

 idahoense (141) 

 nivale (144) 

 occidentale (143) 

 randolphi (145) 

 rotundatum (143) 

 scutellatum (141) 



