QUATERNARY AGE. 289 



Helix pulchella, Mull, all Eastern Nebraska and Republican 

 Valley. 



Helix , Republican Valley. 



Helix , Otoe and Nemaha Counties. 



Helix , Otoe and Nemaha Counties. 



Helix , Otoe and Nemaha Counties. 



Helix , Dakota and Dixon Counties. 



Helix , Dakota and Dixon Counties. 



Bulimulus dealbatus, Say, Middle Loess of Nemaha County. 



Cionella subcylindrica, Linn., Southeastern Nebraska. 



Pupa muscorum? Linn., Cedar County. 



Pupa blandi, Morse, Dixorf^ Dakota and Burt Counties. 



Pupa fallax, Say, Dixon, Dakota and Burt Counties. 



Pupa armifera, Say, all Eastern Nebraska. 



Pupa corticaria, Say, all Eastern Nebraska. 



Succinea haydeni? W. G B., Republican Valley. 



Succinea mooresiana, Lea, Republican Valley. 



Succinea avara, Lea, Republican Valley. 



Succinea obliqua, Say, Dixon and Dakota Counties. 



Succinea , Otoe and Nemaha Counties. 



Zonites fuliginosa, Griff, Republican Valley. 

 Zonites lasvigata? Pfeifer, Republican Valley. 

 Zonites inornata, Say, Cass and Otoe Counties. 

 Zonites, gularis, Say, Southeastern Nebraska. 

 Carychium? exiguum? Say, Nemaha County. 

 Limnoea stagnalis? Linn., Washington County. 

 Limncea reflexa, Say, Dakota and Dixon Counties. 

 Limnoea palustris, Mull., along Missouri Bluffs. 

 Physa gyrina, Say, Dakota County. 

 Physa heterostropha, Say, Douglas County. 

 Physa , Douglas County. 



Physa , Douglas County. 



Psulinus , Otoe County. 



Planorbis glabratus, Say, Otoe County. 

 Planorbis campanulatus, Say, Dakota County. 

 Planorbis corpulentus? Say, Dakota County. 

 Planorbis deflectus, Say, Nemaha County. 

 Planorbis albus? Mull., Dixon County. 

 Ancylus , Dakota, Harlan County. 

 Valvata tricar in at a, Say, Dixon County. 



