Bull. U. S. B. 1\, 1924. (Doc. 968. 



Fig. 121.— Diatom plankton in the western side of the basin of the Gulf ol Maine, Maj 5, 1915 1 tation 10267 

 surface), dominated by the oc ticspecies I ztoceras densum. x 150- (See list, p. 129.) 



Firs [22. Diatom plankton on the north* tern] irt of Georges Bank, Vpril 17, 1920 i tation 20111), dominated 

 d\ Coscinodiscus, with several species of ( tisetoceras X 40. (See list, p. 430.) 



