84 YORKSHIRE NATURALISTS' UNION. 



Mougeotia genuflexa Ag. York and Riccall. 



Spirogyra nitida Dillw. Riccall. 



Chroolepus aureum Ktz. Baugh Fell, 



Vaucheria caespitosa Ag. Dent and Markington. 



Oscillatoria rupestris Ag. Ingleton. 



Sirosiphon compactus Ktg. Brant Fell. 



Euastrum elegans Breb. Riccall. 



E. oblongum Ralfs. Riccall and Markington. 



Cosmarium margaritiferum Turp. Riccall. 



C. pyramidatum Breb. Riccall. 



Arthrodesmus convergens. Riccall. 



Staurastrum gracile. Riccall. 



S. furcigerum. Riccall. 



Pieurotsenium baculum Breb. Riccall. . 



Closterium acerosum Schr. Markington. 



C. costatum Cda. Markington. 



Sphserozosma vertebratum Breb. Riccall. 



Raphidium polymorphum Fres. var. falcatum. Riccall 



and Markington. 

 Scenedesmus quadricauda Breb. Riccall. 

 Penium Brebissonii Ralfs. Riccall. 

 Fragilaria capucina Desm. York and Doncaster. 

 Cymbella ventricosa Ag. Ingleton. 

 Gomphonema acuminatum Ehi-h. Ingleton. 

 Tabellaria flocculosa Kg. Riccall. 

 Gonium tranquillum Ehrh. Riccall. 



Trans. Y.N.U., 1879. Series E 



