THE NAUTILUS. 93 



Quadrula pustulosa var. Chikaskia River, Drury, Kansas. 



A peculiar shell is associated with pustulosa at this locality. It is 

 compressed, quite elongated, and the surface is ornamented with 

 many olive-green rays, radiating from the umbones. It is smooth, 

 like schoolcraftensis, but is much more elongated than that variety, 

 to which the Oklahoma pustulosa might quite appropriately be re- 

 ferred. No specimens of the typical pustulosa have been seen from 

 the region in question. Additional material may show this to be a 

 recognizable race of pustulosa. 



Quadrula rubiginosa (Lea). Chikaskia River, Drury, Kansas. 



Quadrula coecinea (Conrad). Chikaskia River, Drury, Kansas; 

 Chikaskia River, Tonkawa, Oklahoma. 



Sphcerium simile Say, variety. Tonkawa, Oklahoma; Wild Horse 

 Creek, Spivey, Kansas. 



A much elongated and very cylindrical shell, which may prove to 

 be a race of simile. 



Spharium striatinum Lamarck. Sand Creek, Argonia, Kansas. 



Muscidium transversum (Say). Shoofly Creek, Williston, Okla- 

 homa. 



MuscuKum elevatum (Haldeman). Tonkawa, Oklahoma; Meridian 

 Creek, South Ifeven, Kansas. 



Not quite typical, the shell being more elongate ovate in outline 

 than in typical elevatum. 



GASTROPODA. 



Physa crondalli Baker. Wild Horse Creek, Spivey, Kansas; 

 Sand Creek, Argonia, Kansas; Meridian Creek, South Haven, Kan- 

 sas; Spring Creek, Anthony, Kansas; Shoofly Creek, Williston, 

 Oklahoma; Spring Creek, Grant Co., Oklahoma. 



Physa ancillaria Say. Spring Creek, Grant Co., Oklahoma; 

 Wild Horse Creek, Spivey, Kansas; Tonkawa, Oklahoma; Shoofly 

 Creek, Williston, Oklahoma. ' 



The specimens are exactly comparable with typical ancillaria from 

 Philadelphia. 



Physa anatina Lea. Tonkawa, Oklahoma. 



Ancyhis rividaris Say. Shoofly Creek, Williston, Oklahoma. 



Planorbis trivolvis Say. Wild Horse Creek, Spivey, Kansas; 

 Spring Creek, Grant Co., Oklahoma. 



Planorbis deflectus Say. Spring Creek, Anthony, Kansas. 



