33 



Siuuroneis anceps produda Lagerst. 



Weeping Water. (4708) 

 Stauroneis gracilis W. Sm. 

 Plattsmouth. (4722) 

 Stauroneis heufleriana Grun. 



Holt county. (4710) 

 Suriraya elegans Ehr. 



Holt county. (4709) 

 Suriraya ovalis Breb. 



Talmage, Cherry county. (4727) 

 Suriraya ovalis minuia (Breb. ) V. H. 



Talmage, Julian, Salem, Fairbury. (4719) 

 Suriraya ovalis pinnata (W. Sm. ) V. H. 



Cook, Auburn, Salem, Fairbury, Arago, Talmage, Weeping 

 Water. (4714) 

 Suriraya splendida (Ehr.) Kuetz. 



Talmage. (4726) 

 Synedra affinis Kuetz. 



Holt county. (4708) 

 Synedra affinis delicaiula Grrun. 



Weeping Water. (4723) 

 Synedra affinis tabulata (Ag. ) V. H. 



Lincoln. (4715) 

 Synedra capHata Ehr. 



Bellevue; fossil, central Nebraska, Mullen. (4724) 

 Synedra famelica minuscula Grun. 



Fossil, central Nebraska, Mullen. (4725) 

 Synedra radians Kuetz. 



Fossil, Mullen. (4706) 

 Synedra rumpens Kuetz. 



Talmage. (4707) 

 Synedra tenuissima Kuetz. Bacil. 68. 1844. 

 Synedra acus Kuetz. 1. c. 

 Frustulia tenuissima Kuetz, Syn. Piat. 24. 1834. 



