1906] Land and Fresh Water Shells. 117 



Limncea desidiosa, Say. (Teste Dall.) 



Sumas Prairie, W. Spreadborough ; many specimens. 



Limncea Vahlii? (Beck) Moller. Young. 

 Or L. lepida, Gould, young. Dall. 



Sumas Prairie, W. Spreadborough ; twelve specimens. 



Planorbis ( Pierosoma) trivolvis ? Say. 



Sumas Prairie, and small lake at Hope, W. Spreadborough ; 

 several immature specimens from each of these localities. These 

 specimens are probably referable to P. trivolvis, but they may be 

 young shells of P. fiinneyi, Tryon. 



Planorbis ( Menetus ) opercularis, Gould. 



Sumas Prairie, W. Spreadborough ; several specimens. 



Piano/ bis ( Menetus ) opercularis, Gould, 

 var. Centervillensis, Tryon. Teste Dall. 



Peat bog near the Skagit River, J. M. Macoun ; four speci- 

 mens. 



Planorbis ( Torquis ) vermicularis, Gould. 



Marsh near Lake House, on the Skagit River, J. M. Macoun ; 

 several living specimens. 



Physa propinqua, Tryon. 



Sumas Prairie, W. Spreadborough, seven specimens ; and 

 Similkameen River, J. M. Macoun, six specimens. This is the 

 Physa heterostropha of Baird, but apparently not of Say. 



Physa gyrina, Say. Teste Dall. 



Sumas Prairie, W. Spreadborough ; several specimens. 

 Physa Nuttalli, Lea. Teste Dall. 



Sumas Prairie, W. Spreadborough ; thirteen specimens. 

 Zonitoides arborens (Say). 



Peat bog near the Skagit River, J. M. Macoun ; five speci- 

 mens. 



Euconulus fulvus (Draparnaud). 



Peat bog near the Skagit River, J. M. Macoun ; one specimen. 



