Bull. U. S. B. F., 1924. (Doc. 968.) 
Fig. 121. — Diatom plankton in the western side of the basin of the Gulf of Maine, May 5, 1915 (station 10267, 
surface), dominated by the oceanic species Chaetcceras densum. X 150. (See list, p. 429.) 
Fig. 122.— Diatom plankton on the northeastern part of Georges Bank, April 17 .1920 (station 20111), dominated 
by Coscinodiscus with several species of Chaetoceras. X 40. (See Jjst, p. 430.) 
