10 KANSAS UNIVERSITY SCIENCE BULLETIN. 



terial was taken is given. When this is not possible, the term 

 "tributary" is used. As a general rule, the tributaries are 

 streams emptying directly into the river under which they are 

 placed, and the only exceptions to this, I believe, are the tribu- 

 taries of the Arkansas arising in the southeastern corner of the 

 state. Stagnant ponds in the region drained by a stream have 

 been classed as tributaries, even through they have no direct 

 connection. 



The above method of classifying the water systems of the 

 state will, very possibly, be found not the best for a final ar- 

 rangement, but for a preliminary classification — and nothing 

 more than a preliminary arrangement can be hoped for at 

 present — it seems quite satisfactory. 



MISSOURI RIVER, C. virilis, (5?). 



Tributaries, C. virilis, (5?), (22), (20?) ; C. diogenes, (1) ; 

 C. immunis, (1) . 



KANSAS RIVER, C. virilis, (3?), (6?), (11?). 



Tributaries, C. virilis, (1), (3?), (6?), (11), (18), (20) ; C. 

 gracilis, (2) ; C. diogenes, (2) ; C. immunis, (2) ; C. immu- 

 nis, var. spinorostris , (2) . 



Wakarusa River, C. virilis, (23). 



Rock creek, C. virilis, (14). 



Washington creek, C. virilis, (15). 



Coon creek, C. virilis, (16). 



Wildhorse creek, 0. virilis, (17). 



Ward's creek, C. virilis, (2) ; C. immunis, var. spinoros- 

 tris , ( 1 ) . 



Mill creek, C. neglectus, (1). 



Wildcat creek, C. virilis, (26) ; C. neglectus, (4). 

 Republican River, C. virilis, (7) ; C. neglectus, (2). 



Sappa creek, C. virilis, (9) ; C. neglectus, (3). 



Solomon River, C. pilosus, (1 ?). 



Tributaries, C. pilosus, (1 ?). 

 Smoky Hill River. 



Big creek, or tributary to it, C. simulaus, (2) ; C. immunis, 

 (2) ; C. virilis, (8). 

 Saline River. 



Bullfoot creek, C. virilis, (24). 



Spillman croek, C. virilis, (25). 



A tributary of Salt creek, C. pilosus, (2). 



