27 



Gomphonema montanum commutatum Grun. 



Talmage, Weeping Water. (4619) 

 Gomphonema montanum suhclavaium Grun. 



Bratton, Talmage; fossil, Mullen. (4620) 

 Gomponema rostellatum lanceolatum V. H. 



Talmage. (4621) 

 Gomphonema turris Ehr. 



Talmage. (4622) 

 Hantzschia amphioxys (Ehr. ) Grun. 



Lincoln, Talmage, Weeping Water, Sheridan, Glierry aarT 

 Holt counties; fossil Mullen, central Nebraska. (4623) 

 Hantzschia elongata (Hantzsch) Grun. 



Talmage, Holt county; fossil, Mullen. (4624) 

 Homoeocladia filiformis W. Sm. 



Fairbury. (4625) 

 Melosira distans ( Ehr. ) Kuetz. 



Bellevue; fossil, central Nebraska, Mullen. (4626) 

 Navicula ambigua Ehr. 



Talmage, Tecumseh, Humboldt, Brownyille, Weeping Water 

 Sheridan county. (4627) 

 Navicula atomoides Grun. 



Palls City, Talmage, Fairbury, Humboldt, Bellvue, Aubura 

 (4628) 

 Navicula atomis (Kuetz.) Grun. 



Humboldt, Talmage, Peru. (4629) 

 Navicula bacilliformis Grun. 



Fossil, Mullen. (4630) 

 ivavicula bahusiensis Grun. 



Fairbury. (4631) 



Nu.vicula cocconeiformis Greg. 



Humboldt. (4682) 

 Navicula cryptocephala veneta (Kuetz.) Eabenh. 



Brock, Talmage, Peru, Pawnee City, Humboldt, Julian 

 Falls City, Rulo, Dawson, Salem, Aspinwall, Fairbury^ 

 Tecumseh, Auburn, Weeping Water, Ashland. (4633) 



