Baker — Notes on a Collection of yfollusks. 3 



My thtinks are due to Mr. Frank M. Woodruff, of the 

 Chicago Academy of Sciences, for preparing the photographs 

 for the plate which accompanies this paper, to Mr. Bryant 

 Walker, Detroit, Mich., for identifying several species, and 

 to Dr. Nason for the privilege of studying the collection. 



Systematic Catalogue of Species. 



Class PELECYPODA. 



Order PKIONODESMACEA. 



Family Unionidae. 



Lampsilis luteola Lamarck. 



Thunder Bay; Stony Point, Thunder Bay; Long Lake. 



The specimens are yellowish and very thin from Long 

 Lake, but those from Thunder Bay are very large and heavy, 

 similar to those from Lake Michigan, showing admirably the 

 effect of rough, cold water. 



Strophitus edentulus Say. 



Thunder Bay River; Ox Bow. Very thin (for the species) 

 and much enlarged behind the umbones. 



Anodonta grandis footiana Lea. 



Long Lake; Stony Point; Thunder Bay. 



This species exhibits the same variation in its two habitats 

 as does luteola. The Thunder Bay specimens are large and 

 heavy, with inflated shell and pronounced umbones. Those 

 from Long Lake are thinner and very variable in form. 



Alasmidonta marginata Say. 

 Thunder Bay River ; Ox Bow. 



Order TELEODESMACEA. 



Family Sphaeriidae. 



Sphaerium vermontanum Prime. 

 Long Lake. 

 Not as solid as specimens from Lake Michigan. 



