82 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 7 



Fig. 17. Rhizosoletiia calcar a-vis Schultze. 

 17a. A more slender cell. 

 17h. Apex of cell more highl}- magnified. 



Fig. 18. Rhizosolenia alata Brightw. Entire cell. 

 18a. End of another cell. 



Fig. 19. Rhizosolniia alata f. indica (Perag.) Osten. 



Fig. 20. Rhizosolenia acuminata (Perag.) Gran. 

 20a. Apex of cell more highly magnified. 



