walker: shells of Michigan. 335 



County as U. leprosies by Miles. 



Unio rubiginosus Lea. 



U. Schoolcraftii Lea. 



U. spatulatus Lea. 



U. subovatus Lea. Miles, Currier. 



U. subrotundus Lea. Sager, Miles. 



U. tenuissimus Lea. Miles, Currier. 



U. trigonus Lea. Miles, Currier. 



U. triangularis Bar. 



U. undulatus Say. Sager, Miles. 



U. ventricosus Bar. 



Margaritana complanata Bar. 



M. deltoidea Lea. 



M. Hildrethiana Lea. 



IVl. marginata Say. 



M. rugosa Bar. 



M. undulata Say. Sager. Undoubtedly an error as the 

 species is an eastern one. 



Anodonta Benedictii Lea. 



A. decora Lea. Anthony, Currier. x\mong the Arwdons 

 from this state described as new species by Anthony, one form, 

 A. inornala, is referred to this species by Mr. Lea. 



A. edentula Say. Our most abundant species, and like 

 all our Anodons extremely variable. A well marked variety 

 occurring in the small lakes in the interior of the state has been 

 described as A. rhombica Anth. 



A. Ferussaciana Lea. Sager, Miles, Currier. 



A. fluviatilis Dill. Sager, Miles. As the species is an 

 eastern one, the citation is evidently erroneous. 



A. Footiana Lea. A very abundant and variable species. 

 Two forms have been described as distinct by Anthony, i.e., A. 

 McNeilii and A. opalina. 



