WALKER : SHELLS OF MICHIGAN 333 



Goniobasis livescens Mke. 



G. Milesii Lea. Type specimens from Tuscola County 

 Michigan. 



G. depygis Say. Sager. As this species does not appear 

 in any of the later lists, the citation is perhaps erroneous and may 

 refer to a form of G. livescens. 



G. pulchella Anth. Miles, Tryon. 



G. virginica Gmel. Sager, Miles. This species is purely 

 an eastern one and the reference is no doubt erroneous. As F. 

 siibulare is not quoted in either of the above lists, it may have 

 been the species intended. 



Unio alatus Say. 



Unio asperrimus Lea. Miles, Currier. 



U. caelatus Con Sager, Miles. Undoubtedly erroneous 

 as the species is a southern one. 



U. Canadensis Lea. 



U. cariosus Say. Sager, Miles. Very doubtful. 



U. circulus Lea. 



U. coccineus Lea. 



U. complanatus Sol. Sager, Miles. Evidently a mistake 

 as the species is confined to the east. 



U. COrnutus Bar. Currier. 



U. elegans Lea. Miles, Currier. 



U. ellipsis Lea. 



U. ellipsiformis Con. This species is described and 

 figured by Conrad in his Monograph as from Michigan. Nothing 

 more is known about it. It is placed among the species unknown 

 to him by Dr. Lea in his last Synopsis and must remain in un- 

 certainty until re-discovered or identified by some fortunate 

 collector. 



U. gibbosus Bar. 



U. glans Lea. Miles, Currier. A very rare species in this 

 state. The only locality from which it is recorded is at Pontiac 



