26 



Cysiopleura gibberida (Ehr.) Kuntze. 



Talmage. (4602) ' 

 Cystopleura musculus constricta (Breb. ) V. H. 



Sheridan county. (4603) 

 Cysiopleura iurgida vertagus (Kuetz. ) Grun, 



Fossil, central Nebraska. (4604) 

 Cystopleura turgida westermannii (Ehr.) Grun. 



Fossil, central Nebraska. (4605) 

 Denticula elegans Kuetz. 



Fossil, Mullen. (4606) 

 Diatoma vulgare Bory. 



Fossil, central Nebraska. (4607) 

 Encyonema caespUosum auersioaldii (Rabenh.) V. H. 



Fossil, MuUeu. (4608) 

 Encyonema prostratum (Berk. ) Ealfs. 



Fairbury. (4609) 

 Eunotia formica Ehr. 



Fossil, Mullen. (4610) 

 Fragilaria consiruens venter Grun 



Fossil, central Nebraska, Mullen. (4611) 

 Fragilaria elliptica Schum. 



Fossil, central Nebraska, Mullen. (4612), 

 Fragilaria virescens Ealfs. 



Fossil, Mullen. (4613) 

 Frustulia bohemica (Ehr. ) Eabenh. 



Sheridan and Cherry counties. (4614) 

 Gomphonema acuminaiiim Ehr. 



Bellevue. (4615) 

 Gomphonema gracile Ehr. 



Fossil, Mullen. (4616) 

 Gomphonema micropus Kuetz. 



Lincoln. (4617) 

 Gomphonema monianum Schum. ' 



Auburn, fossil, central Nebraska. (4618) 



