THE NAUTILUS. 



127 



Swimming Wmnan Creek Canyon. 

 On July 4, 1914, a very brief visit to Swimming Woman 

 Creek Canyon in the Big Snowy Mountains resulted in the fol- 

 lowing collection: 



Vallonia costata montana Sterki 

 Thysanophora ingersolli convexior Ancey (dead) 

 Oreohelix cooperi berryi Pilsbry. 

 Pyramidula cronkhitei (Newcorab) . 

 Zonitoides arborea (Say) (very large) 

 Euconulus fulvus (Miiller) 

 Vitrina alaskana Dall (dead) . 

 Pupilla muscorum (Linn.) (dead) . 

 Vertigo modesta parietalis Ance}" (dead) 



The Euconulus seem to me for the most part intermediate be- 

 tween typical fulvus and alaskensis. They could perhaps be 

 classified with equal exactitude either way. 



The OreoheUces listed are members of a very small race de- 

 scribed in a recent number of this periodical by Pilsbry (Nau- 

 tilus vol. 29, p. 48), but it is so much the most conspicuous 

 snail of the region that such figures of population as those given 

 in the above columns indicate the relative abundance of all the 

 smaller forms in a ver)' unsatisfactory way. I doubt very much 

 whether Oreohelix actually does replace Vallonia as the most 

 abundant snail, even at this altitude. Live shells of both were 

 fairly common, and dead ones abundant all over the eastern 

 wall of the canyon at the spot visited, occurring at or near the 

 surface among the mass of small loose rock and shrubbery which 

 covered the slope. The other species, where so noted, were in 

 the same situation, while those taken on the floor of the canyon 

 were found under sticks and small logs in rather moist situations 

 along the creek. 



The locality for both slope and floor is jnst within the mouth 

 of the canyon, and is probably just south of the present county 

 line. If so, this would bring it into Musselshell County and 

 not Fergus, as stated in the original description of 0. c. berryi. 



