Bull. U. S. B. F., 1924. (Doc. 968.) 
Fig. 117. — Phytoplankton near Seguin Island, March 4, 1920 (station 20058), dominated by Laudcria glacialis, 
Thalassiosira, Chaetoeeras, Rhizosolenia, and Tlialassiothrix nitschioides. (See list, p. 425.) 
Fig. 118. — Sample of a rich flowering of Thalassiosira from a surface haul off Penobscot Bay, May 12, 1915 (station 
10276). X 150 
