433 



MELOSIRA. 



Fig. 164. Pantocsekia clivosa. 



The genus includes only a single species P. clivosa Grun., which is 

 found in various deposits in Hungary. 



GENUS 109. MELOSIRA AGARDH, 1824. 



Valves circular, plane or convex, often with small teeth at the 

 junction of the frustules, which are united into a filament of greater 

 or less length. 



f 





Fig. 165. Melosira varians. 



