Bull. r. S. B. 1'.. 1924. I Doc. '.His. 



FIG. 130.— Phytoplankton dominated by Halosphiera, with Ceraliiim longipfS. Surface haul off Shelburnc, N( 



Bcotia, June 23, 1911 (station 10293). X 40 



Fio 131. Plankton dominated bj the radiolarian genus Acanthometron. Surface haul off Cape Ann, 



August 2.'. r.ui (station 10253). X 50 



