94 THE NAUTILUS. 



Strophitus edentuius 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. 



Quadrula lachrymosa Lea. Clay Co. 



Quadrida pustulosa Lea. 



Quadrula undulata Barnes. Deuel, Clay and Spink Counties. 



Sphserium stdcatufii Lam. Washabaugh and Deuel Counties. 



Sphaerium rhomboideum Say. Hidewood Creek, Deuel Co. 



Sphserium simile Say. Deuel Co. 



Sphserium stramineum Conr. Lake Kampeska, Codington Co. 



Sphserium striatinum Lam. Deuel Co. 



Sphserium striatinum acuminatum Prime. Ziebach, Harding, 

 Perkins and Butte Counties. 



Musculium partumeium Say. Deuel Co. 



Mv.scxdium seaire Prime. Pennington and Perkins Counties. 



Muscidium jayense Prime. Ziebach, Perkins and Deuel Coun- 

 ties. 



Pisidium contortiim Prime. Harding Co. 



Pisidium mainense Sterki. (or near) Deuel Co. 



Pwidium affine Sterki. Deuel Co. 



Pisidium subrotundum Sterki. Pennington Co. 



Pisidium, abditum Hald. Pennington and Washington Coun- 

 ties. 



Pisidium variabile Prime. Washabaugh Co. 



Pisidium kirklandi Sterki. Deuel Co. 



Pisidium compressum Prime. Deuel Co. 



