lymx.eid.e of north America. 



61 



The comparative distribution of American Lymnseas is shown in 

 the following table : 



TABLE OF DISTRIBUTION OF AMERICAN LYMNSEAS. 



Species 



stagnalis 



s. appressa 



s. perampla . . . . 

 s. 'wasatehensis . 



s. lillianae 



sanctaemariae 

 occidentalis 



lepida 



columella 



c. chalybea. 



c. casta 



c. championi 



francisca 



utahensis 



megasoma 



haldemani 



truncatula 



doddsi 



cubensis 



c. barbadensis. . 



bulimoides 



b. techella 



b. cockerelli . . . 



b. cassi 



sonomaensis . . . 



hendersoni 



perpolita 



caperata 



holbolii 



umbilicata 



cyclostoma 



parva 



p. sterkii 



owascoensis 



dalli 



pllsbryi 



humilis 



b. modicella. . . . 



h. rustica 



ferrug-inea 



obrussa 



o. peninsulae. . . 



o. exigua 



o. decampi 



galbana 



petoskeyensis . . 



palustris 



p. alpenensis. . . . 



p. desidiosa 



p. blatchleyi. . . . 



elodes 



e. jolietensis. . . . 



*>. shurtleffi 



reflexa 



r. walkeri 



r. hemphilliana. 



exilis 



kirtlandiana . . . 



lanceata 



attenuata 



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