268 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Eelix , Otoe and Nemaha Counties. 



Helix 5 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. 



Fupa hlandi Morse, Dixon, Dakota, and Burt Counties. 



Pu]}afallax Say, Dixon, Dakota, and Burt Counties. 



Fupa armifera Say, all Eastern Nebraska. 



Piipa Gorticaria Say, all Eastern Nebraska. 



Succinea haydenif W. G. B., Eepublican Valley. ' 



Succinea mooresiana Lea, Republican Valley. 



Succinea avara, Lea, Eepublican Valley. 



Succinea ohliqua, Say, Dixon and Dakota, Counties. 



Succinea , Otoe and Nemaha Counties. 



Zonites fuUgitiosa, Griff., Eepublican Valley. 

 Zonites Imvigata f Pfeiffer, Eepublican Valley. 

 Zonites inornata, Say, Cass and Otoe Counties. 

 Zonites guiaris, Say, Southeastern Nebraska. 

 Carychium f exiguum ? Say, Nemaha Couuty. 

 Limncea stagnalis f Linn., Washington County. 

 Limncea replexa Say, Dakota and Dixon Counties. 

 Limncea palustris Miill., along Missouri Bluffs. 

 Fhysa gyrina Say, Dakota County. 

 Fhysa heterostropha Say, Douglas County. 



Fhysa , Douglas County. . 



Fhysa , Douglas County. 



Fsulimis , Otoe County. 



Flanorbis glahratus Say, Otoe County. 

 Flanorbis campanulafus Say, Dakota County. 

 Flanorbis corpulentus f Say, Dakota County. 

 Flanorbis defiectus Say, Nemaha County. 

 Flanorbis albusf Miill., Dixon County. 



Ancylus , Dakota, Harlan County. 



Valvafa tricarinata Say, Dixon County. 



Valvata Say, Otoe and Burt Counties. 



Vivipara intertexta f Say, Otoe County. 



Vivipara subpurpurea f Say, Otoe and Nemaha Counties. 



Vivipa7'a 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. 



Fomatiopsis lapidaria Say, Dakota County. 



Helicina orbiculata Say, Nemaha County. 



Angitrema armigera Say, Nemaha County. 



Lithasia obovata Say, Richardson Couuty. 



Fleurocera undulatum f Harlan County. 



Fleurocera canoleculatum Say, Nemaha County. 



Fleurocera elevatum Say, Otoe County. 



Fleurocera labiatum f Lea, Eichardson County. 



Fleurocera simplex f Lea, Otoe County. 



Ooniobasis depygis Say, Eichardson and Otoe Counties, 



Goniobasis livescensf Menke, Eichardson County. 



