INDEX 



i6 7 



Planorbis virens 94 



vortex 82, 85 



vulgar is 82 



wheatleyi 97, 98 



yzabalensis 82, 86 

 Planorbula (97), 98 



armigera 98 



christyi 99 

 Plesiophysa 101 

 Pleurocera 116 



canaliculata ub 

 Pleurolimnaea (60), 63, 64 



tenuicostata 60 

 Poeyia (108) 



gundlachioides 108 

 Polita (39) 



fulva (40) 

 Polygyra 24 



albolabris 26 



columbiana 24, 34 



devia 24 



germana 25, 26 



labiosa (24) 



megasoma 26 



monodon 26 



ptychophora 25 



santacruzensis 24 



townsendiana 2j 

 Polygvrus (83) 

 Polyrhytis (6l), 63, 64 

 Poraatiopsis ng 



lapidaria 119, (120) 

 Pompholyx 63 

 Primella raymondi (139) 

 Pristiloma 44 



arctica 45 



idahoense 44 



lansingi 44 



pilsbryi 44 



stearnsi (44), 45 



stearnsii 44 



taylori 44 

 Prophysaon 46 



andersoni 46 



coeruleum 4? 



dubium (47) 



fasciatum (47) 



flavum (46) 



foliolatum 4 



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 101 

 Punctum 53 



asteriscus 53 



conspectum 10, jj 

 minutissimum (53) 

 pugetensis (43) 

 pygmaeum jj 

 randolphi jj 



Pupa alticola (54) 

 arctica (32) 

 arm if era (27) 

 badia (28) 

 bigranata (28) 

 blandi (28) 

 colurnella (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 



