THE NAUTILUS. 



VOL. XIV. JULY, 1900. No. 3. 



IN SEARCH OF POLYGYRA PILSBRYI. 



BY .)AS. H. FERRISS. 



In the month of February, both in 1899 and 1900, I made trips to 

 Arkansas for health and shells, and on both occasions stopped at 

 Hardy, Sharp county, Ark., on Spring River, which heads at the 

 famous Mammoth Springs, in Missouri. This part of America at 

 some time was plainly lifted by an enormous upheaval, and the lime- 

 stone came down without regard to good order. The highest points 

 are probably 1000 feet above the sea. 



Spring river is a beautiful stream. The water so pure and deep is 

 of a Nile green in color, but in every half mile or so at this point 

 there is a natural dam, covered with tine unios and " periwinkles." 

 When Messrs. Sterki and Simpson have helped me over the hard 

 places, a list of these will be given. I found this year one new Unio 

 anyhow. 



Half of one day this year was given to Little Rock, where good 

 collecting is to be found in a rocky bluff' near the Iron Mountain 

 bridge. 



Upon both trips I jumped to DeKalb, Bowie county, Texas. Last 

 year I went with a party of turkey hunters as far as Little River, in 

 the Choclaw Nation, all in the low lands, then by rail to Tuhskahoma 

 and Poteau, on the Frisco road another blown-up limestone coun- 

 try. In this part of the Indian nation the road passes between two 

 mountain ranges. It is the prettiest of landscapes, and I am sure in 

 the month of May the snails swarm out of the clamp corners and fern- 

 clothed rocks in great numbers to view the scenery. Judging by the 

 government maps of near-by territory, these mountains are about 



