INDEX 



i6 7 



Planorbis virens 9^ 



vortex 82, 85 



vulgaris 82 



wheatleyi 97, 98 



yzabalensis 82, 86 

 Planorbula (97), 98 



armigera 98 



christyi 99 

 Plesiophjsa 101 

 Pleurocera lib 



canaliculata lib 

 Pleurolimnaea (60), 63, 64 



tenuicoetata 60 

 Poeyia (108) 



gundlachioides 108 

 Polita (39) 



fulva (40) 

 Polygyra 24 



albolabris 26 



columbiana 24, 34 



devia 24 



germana 23, 26 



labiosa (24) 



megasoma 26 



rnonodon 26 



ptychophora 25 



santacruzensis 24 



townsendiana 23 

 Polygyrus (83) 

 Polyrhytis (61), 63, 64 

 Pomatiopsis 119 



lapidaria 119, (120) 

 Pompholyx 63 

 Primella raymondi (139) 

 Pristiloma 44 



arctica 43 



idahoense 44 



lansingi 44 



pilsbryi 44 



stearnsi (44), 45 



stearnsii 44 



taylori 44 

 Prophysaon 46 



andersoni 46 



cceruleum 47 



dubium (47) 



fasciatum (47) 



flavum (46) 



foliolatum 47 



Prophysaon hemphilli (46), 47 



humile 47 



marmoratum (46) 



obscurum (47) 



pacificum (46) 



pallidum (46) 



suffusum (46) 

 Proptera alatus (127) 

 Protancylus 109 

 Pseudohyalina minuscula (43) 



pugetensis (43) 

 Pterosygna 131 

 Pulmobranchia IOI 

 Punctum 53 



asteriscus 53 



clappi5i,5J 



conspectum 10, 5J 



minutissimum (53) 



pugetensis (43) 



pygmaeum jj 



randolphi jj 

 Pupa alticola (54) 



arctica (32) 



arm if era (27) 



badia (28) 



bigranata (28) 



bland i (28) 



columella (54) 



contracta (27) 



corpulenta (29) 



costulata (21) 



decora (29) 



edentula (54) 



exigua (116) 



gouldii (30) 



gredleri (54) 



holzingeri (28) 



hoppii (29) 



lundstromi (28) 



milium (32) 



modesta (29) 



pentodon (28) 



pygmaea (33) 



signata (28) 



simplex (54) 



steenbuchi (29) 



superioris (33) 

 Pupidae 27 

 Pupilla 28 



