268 GEOLOGICAL SURVEY OF THE TERRITORIES. 



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 Lacustrine of Nemaha County. 



Cionella subcylindrica Linn., Southeastern Nebraska. 



Pupa muscorum f Linn., Cedar County. 



Pupa Mandi Morse, Dixon, Dakota, and Burt Counties. 



Pupafallax 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. 



Suecinea obliqua, Say, Dixon and Dakota Counties. 



Succinea , Otoe and Nemaha Counties. 



Zonites fuliginosa, Griff., Republican Valley. 

 Zonites laevigata f Pfeiffer, Republican Valley. 

 Zonites inornata, Say, Cass and Otoe Counties. 

 Zonites gularis, Say, Southeastern Nebraska. 

 Carychium f exiguum f Say, Nemaha County. 

 Limnwa stagnalis f Linn., Washington County. 

 Limnwa replexa Say, Dakota and Dixon Counties. 

 Limnwa 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 f Say, Dakota County. 

 Planorbis defiectus Say, Nemaha County. 

 Planorbis albusf Mull., Dixon County. 



Ancylus , Dakota, Harlan County. 



Valvata tricarinata Say, Dixon County. 



Valvata Say, Otoe and Burt Counties. 



Vivipara intertexta ? Say, Otoe County. 



Vivipara subpurpurea f Say, Otoe and Nemaha Counties. 



Vivipara contectoides Binney, Nemaha County. 



Melantho ponderosa Say, Washington County. 



Melantho decisa Say, Burt County. 



Amnicola perata f Say, Washington County. 



Amnicola lemnosa f Say, Washington County. 



Pomatiopsis lapidaria Say, Dakota County. 



Helicina orbictdata Say, Nemaha County. 



Angitrema armigera Say, Nemaha County. 



Lithasia obovata Say, Richardson County. 



Pleurocera undulatuni f Harlan County. 



Pleurocera canoleculatum Say, Nemaha County. 



Pleurocera elevatum Say, Otoe County. 



Pleurocera labiatum f Lea, Richardson County. 



Pleurocera simplex f Lea, Otoe County. 



Goniobasis depygis Say, Richardson and Otoe Counties. 



Goniobasis livescens ? Menke, Richardson County. 



