BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 475 
(5), the Ulva, Enteromorpha, and Monostroma associations (6), the Ulothrix associations 
(7), the Phyllitis and Scytostphon associations (15), the Fucus and Ascophyllum associa- 
tions (25), the Bangia association (27), the Porphyra association (28), the Nemalion 
association (30). 
THE PLANKTON. 
The only studies on the plant life present in the plankton of the region covered by 
the survey have been those of Peck (1894 and 1896), chiefly in relation to its value as a 
source of food, especially for the menhaden. In his second paper Peck (1896, p. 356) 
records his observations on the plankton of Buzzards Bay, describing and figuring a num- 
ber of microorganisms belonging to the Peridinales and Bacillariales (Diatomales), 
together with animal forms. His studies were quantitative rather than qualitative, 
and the identification of his material as regards plant life was only partial, but it is 
clear that the plankton of these regions is very abundant and widespread, as would be 
expected of warm, shallow bodies of water. 
