44 THE NAUTILUS. 



Many d< ;id salamanders were along the bank and a few live 

 ones were seen in the water. This shallow water-hole did not 

 look as though it could have existed very long, and it was a 

 long distance from any other water. We were much surprised 

 to see several great blue herons fly from the water at our ap- 

 proach, and wondered Avhat they were feeding upon, or we 

 should not have looked for any mollusks there. It would be 

 interesting to know by what agency they got there. Hand 

 (NAUTILUS, XXVII, 1914, p. 144) noted Planorbis vermicu- 

 laris in a small artificial pond in California, and raised the 

 same question, "How did they get there?" 



Sta. 240, at base of a rocky sandstone ledge about twelve 

 miles north of Lost Cabin on the road to Ten Sleep. 



Pupilla muscorum xerobia Pils. 

 Vallo-nia . cyclophorella Aucey 



Sta. 241, creek bottom about three miles above Ten Sleep. 



Agriolimax campestris (Biiiney). 



Oreohelix cooperi (W. G. B.) ? 



Physa gyrina Say ("peculiar long form") 



Pyramidula cronkhitei anthonyi Pils. 



Succinea avara Say 



Vallonia gracilicosta Reiuh. 



Vitrina alaskana Dall 



Zonitoides arbor ea (Say) 



Only one fragment of Oreohelix was found, apparently 0. 

 cooperi, and it may have been brought down from up-stream 

 in the spring flood. Agriolimax is represented by two very 

 small examples. 



Sta. 242, creek bottom at Hyattville, among willows, narrow- 

 leafed cottonwoods, etc. Vallonia gracilicosta Reinh. 



Sta. 243, bottom lands on Shell Creek, at mouth of White 

 Water Creek, about five miles east of Shell. 



Lymncca obrussa, Say 



Physa anatina Lea 



Planorbis parvus Say 



Pyramidula cronkhitei anthonyi Pils. 



Vallonm gracilicosta Reinh. 



