92 THE NAUTILUS. 



shells from Kansas and Oklahoma. As this region is not well 

 known conchologically, it has been thought that a list of the species 

 would be of value as a contribution to the subject of geographic dis- 

 tribution. The region includes Grant and Kay counties, Oklahoma, 

 and Sumner, Harper and Kingman counties, Kansas. The collection 

 is now deposited in the Chicago Academy of Sciences. My thanks 

 are due to Mr. Bryant Walker and Dr. V. Sterki for assistance in 

 determining critical material. 



PELECYPODA. 



Lampsilis anodontoides (Lea). Chikaskia River, Tonkawa, 

 Oklahoma. 



Lampsilis subrostrata (Say). Spring Creek, Grant county, 

 Oklahoma. 



Lampsilis parva (Barnes). Bluff Creek, Grant Co., Oklahoma. 



Lampsilis purpurata (Lamarck), Chikaskia River, Tonkawa, 

 Oklahoma. 



Lampsilis gracile (Barnes). Shoofiy Creek, Williston, Oklahojpa. 



Plagiola donaciformis (Lea). Chikaskia River, Hunnewell, 

 Kansas. 



Tritogonia tuberculata (Barnes). Chikaskia River, Tonkawa, 

 Oklahoma. 



Anodonta grandis Say. Chikaskia River, Tonkawa, Oklahoma; 

 Chikaskia River, Williston, Oklahoma. 



Anodonta corpulenta Cooper. Duck Creek, near Tonkawa, 

 Oklahoma. 



Anodonta imhecilis Say. Shoofiy Creek, Williston, Oklahoma. 



Symphynota complanata (Barnes). Chikaskia River, Tonkawa, 

 Oklahoma; Chikaskia River, Williston, Oklahoma. 



Unio tetralasmus camptodon Say. Spring Creek, Anthony, Kansas. 



Unio tetralasmus sayi Ward. Spring Creek, Grant Co., Oklahoma. 



Quadrula undulata (Barnes). Chikaskia River, Tonkawa, Okla- 

 homa; Chikaskia River, Drury, Kansas; Shoofiy Creek, Williston, 

 Oklahoma. 



Quadrula undulata lateeostata (Lea). Shoofiy Creek, Williston^ 

 Oklahoma. 



Quadrula lachrymosa (Lea). Chikaskia River, Tonkawa, Okla- 

 homa; Chikaskia River, Drury, Kansas. 



Quadrula pustidosa (Lea). Chikaskia River, Tonkawa, Okla- 

 homa; Chikaskia River, Drury, Kansas. 



