THE GREEN ALGAE OF NORTH AMERICA 99 



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EXPLANATION O'F PLATES. 



PLATE I 



i. (a) Peroniella planctonica, after Smith. X 1200. 



1. () " " " " X 1200. 



2. (a) Mischococcus confervicola, after Nageli. X 45- 

 2. (*) " " " " X 900. 



2. (0 " " " " X 900. 



3. Cryptoglena americana, after Davis. X 1125. 



4. Spondylomorum quaternarium, after Stein. X 800. 



