40 THE NAUTILUS. 



ARKANSAS SHELL COLLECTING. 



BY F. A. SAMPSON. 



In March of the present year I did some collecting at three places 

 in Arkansas, and below I give the result. The first place was at 

 Van Buren, Crawford county, on the bluff above the town. Here I 

 found only four species. 



Bulimulus dealbatus (Say). Two shells were found, both dead 

 ones. 



Polygyra appressa (Say). Two dead shells of 17 and 18 mm. 

 There was scarcely an indication of the lamella-like long denticle on 

 the basal margin that is mentioned in the type description. 



Polygyra inflecta (Say). One-third of the fifteen shells did not 

 have the umbilicus entirely covered. They were of five whorls and 

 9 to 10 mm. 



Polygyra jacksoni (Bland). At Eureka Springs, Arkansas, this 

 species is of five and one-half whorls, and 6 to 6^ mm. 



From various other counties of the State the size is about the 

 same, but from Sebastian county they were larger. The most of 

 those found here, seventy in number, were of 8 mm. and were of 

 decidedly darker color than those from other localities. The same 

 was true of the inflecta, but not as notably so. Shells were gener- 

 ally scarce under large single stones, and were found under piles of 

 stones. 



II. The next locality was at Winslow, at the north end of the 

 tunnel at the top of the Boston Mountains. The first day I collected 

 on both sides of the valley and gathered a considerable number, in- 

 cluding perhaps fifteen Polygyra edentata, but by a misunderstand- 

 ing they were all thrown in the fire. The next day I went over 

 almost the same ground and got the following : 



East side. West side. 



Polygyra perspective!, 1 15 



P. labrosa, 40 77 



P. dorfmillana sampsoni, 5 15 



P. edentata, 8 5 



P. jacksoni, 15 90 



P. neglecta, 20 



P. albolabris alleni, 4 



P. thyroides, 5 



Omphalina fuliginosa oznrkensis, 5 



