19 



Unio 



rubiginosus Lea 



spatulatus Lea 



sulcatus Lea 



perplexus perobliquus Con 



superiorensis Marsh 



tenuissimus Lea 



triangularis Lea 



trigonus Lea 



undulatus Bar 



ventricosus Bar 



oca'dens Lea 



verrucosus Bar 



tuberculosus Raf 



G N V S \SB 



Margaritina 



complanata Bar. 



deltoidea Lea 



hildrethiana Lea. 

 marginata Say. . . 

 rugosa Bar 



Anodonta 

 I. Group of A. corpulenta Cpr 



A. corpulenta Cpr 



subinfiata Anth 



subgibbosa Anth 



II. Group of A. grandis Say 



benedictii Lea 



decora Lea 



inornata Anth 



footiana Lea 



in cue illii Anth.. ., 



opalina Anth 



ovata Lea 



subangulata Anth.. . 



plana Lea 



salmonia Lea 



simpsoniana. Lea . 

 marvattana Lea .. 

 houghtonensis Lent. 



III. Group of A. edentula Say. 



edentula Say 



rhombica Anth 



Group of A. ferussaciana Lea. 



ferussaciana Lea 



modesta Lea 



subcylindracea Lea .... 



Group of A. fragilis Lam. 



fragilis Lara 



fiava Anth 



glandulosa Ant 



imbricata Anth 



irisans Anth 



pallida Anth 



subcarinata Cur 



.M 



Not in extreme southeast. 



Grand river only. 



Group of A. imbecilis Say. 

 imbecilis Say 



Total 40 species. 



Total 5 species. 



In Lake Michigan drainage, 

 only. 



