LAND AND FRESH WATER MOLLUSKS 



TABLE II. DISTRIBUTION OF AMERICAN LAND SHELLS 

 NORTH OF LATITUDE 49 . 



Name of Species. 



Helix hortensis , 



Epiphragmophora fidelis . 



Zoogenites harpa 



Vallonia pulchella 



Vallonia costata 



Vallonia gracilicosta 



Vallonia albula 



Vallonia asiatica 



Polygyra devia 



Polygy ra columbiana 



Polygyra townsendiana .. 



Polygyra germana 



Polygyra monodon 



Polygyra albolabris 



Strobilops labyrinthica .... 



Bifidaria armifera 



Bifidaria contracta 



Bifidaria holzingeri 



Bifidaria pentodon 



Pupilla blandi 



Pupilla muscorum 



Vertigo hoppii 



Vertigo modesta 



Vertigo columbiana 



Vertigo gouldii 



Vertigo ventricosa 



Vertigo binneyana 



Vertigo ovata 



Vertigo arctica 



Cochlicopa lubrica 



Circinaria vancouverensis , 

 Circinaria var. chocolata.. 



Circinaria sportella 



Circinaria var. hybrida.... 



Vitrina angelicse 



Vitrina limpida 



Vitrina alaskana 



Vitrea radiatula 



Vitrea nitidula 



Vitrea binneyana 



Vitrea indentata 



Euconulus trochiformis ... 



Zonitoides nitidus 



Zonitoides arboreus 



Zonitoides randolphi 



Zonitoides minusculus 



Zonitoides milium 



Zonitoides pugetensis 



Pristiloma lansingi 



Pristiloma stearnsii 



54°oo / 

 57 00 

 66 00 



54 00 



51 00 



52 20 

 50 00 



59 00 

 50 00 



60 00 



50 00 



49 00 



51 20 



53 00 



51 20 



52 10 



50 00 

 52 10 



51 20 



52 10 

 59 00 



70 00 

 63 00 



57 00 

 51 00 

 5i 25 

 50 00 

 57 35 

 65 15 



71 20 

 59 00 

 57 00 

 59 00 



55 00 



72 00 



54 00 



57 3° 

 71 20 



61 00 

 50 00 

 50 00 

 70 00 

 61 00 

 61 00 

 59 30 

 59 00 

 50 00 

 49 00 

 49 00 

 59 3° 



