Proceedings Am. Philos. Soc. Vol. LV. 



Plate XI 





c£?j».<5aiK«~_ it- 



Fig. I. Billowed surface of salt marsh at Cold Spring Harbor covered 

 with drift material which smothers the other plants, July, 1914. 



Fig. 2. Salt marsh pool l)ack: of Atlantic City, New Jersey, June 23, 1914. 

 The algJE will he noted growing in the upper right side of the pool. 



