94 THE NAUTILUS. 



Slrophitus edentulus pavonius Lea. Hidewood Creek, Deuel Co. 



Anodonta dakota Frierson. Clear Lake, Deuel Co. 



Anodonta grandis Say. Perkins, Deuel, Spink, Clay and 

 Codington Counties. 



Anodonta grandis footiana Lea. Deuel and Codington Coun- 

 ties. 



Anodonta grandis gigantea Lea. Deuel Co. 



Anodontoides ferussacianus Lea. Washabaugh and Deuel 

 Counties. 



Anodontoides ferussacianus subcylindraceus Lea. Deuel Co. 



Symphynota compressa Lea. Deuel Co. 



Symphynota complanata Barnes. Clay and Deuel Counties. 



Symphynota complanata katherina Lea. Lake Kampeska, Cod- 

 ington Co. 



Arcidens confragosus Say. Clay Co. 



Quadnda lachrymosa Lea. Clay Co. 



Quadrula pustidosa Lea. 



Quadnda undidata Barnes. Deuel, Clay and Spink Counties. 



Sphserium sidcatum Lam. Washabaugh and Deuel Counties. 



Sphs-rium rhomboideum Say. Hidewood Creek, Deuel Co. 



Sphserium simile Say. Deuel Co. 



Sphserium stramineum Conr. Lake Kampeska, Codington Co. 



Sphseriwii striatinum Lam. Deuel Co. 



Sphserium striatinum acuminatnm Prime. Ziebach, Harding, 

 Perkins and Butte Counties. 



Musculium partiimeium Say. Deuel Co. 



Musculium secure Prime. Pennington and Perkins Counties. 



Musculium jayense Prime. Ziebach, Perkins and Deuel Coun- 

 ties. 



Pisidium contortion Prime. Harding Co. 



Pisidium mainense Sterki. (or near) Deuel Co. 



Pisidium offi.ne Sterki. Deuel Co. 



Pisidium subrotundum Sterki. Pennington Co. 



Pisidium. abditum Hald. Pennington and Washington Coun- 

 ties. 



Pisidium variable Prime. Washabaugh Co. 



Pisidium. kirklandi Sterki. Deuel Co. 



Pisidium compression Prime. Deuel Co. 



