Bull. U. S. 15. F., 1924. (Doc. 968.) 



Fig. 114. — Phytoplankton dominated by Ceratiwm tripos with fewer C. fusus. Surface haul in Massachusells 



Bay, October 26, 1915 (station 10337). X 50 



Fig. 115. — Peridinian plankton dominated by Peridinium, with Ceratium Icmgipes and C. arclica. 

 Surface haul, eastern side of basin of the Qulfol Maine, May 6, 1915 (station L0270). X 40 



