PLATE XVIII. 



AFTER NATUR 



T. SINCLAIR ^ SON. PHIUADtLPHIA 



Fig. 1. PRINGSHEIMII INAEQUALE. 



" 2. OEDOGONIUM MIRABILE. 



" 3. OEDOGONIUM ECHINATUM. 



" 4, OEDOGONIUM. 



Fig. 5 BULBOCH/ETE IGNOTA. 

 " 6 BULBOCH.CTE OUMOSA. 

 " 7 CONFERVA. 



