LAND AND FRESH WATER MOLLUSKS 



TABLE II. DISTRIBUTION OF AMERICAN LAND SHELLS 



\0 



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 



Polygyra 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 



Fristiloraa stearnsii 



54°oc/ 

 57 00 

 66 00 



54 00 



51 00 



52 20 

 50 00 



59 00 

 50 00 



60 00 



50 CO 



49 00 



51 20 



53 00 



51 20 



52 10 



50 00 

 52 10 



51 20 



52 ID 



59 00 



70 00 

 63 00 

 57 00 



51 CX) 



51 25 

 50 00 



57 35 

 65 15 



71 20 

 59 00 

 57 00 

 59 00 



55 00 



72 00 



54 00 

 57 30 

 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 30 



