360 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 31 



Fig. 1. Cladophora tiburonetisis, habit, x 30. 



Fig. 2. Cladophora tiburonensis, tip of a sterile branch, x 250. 



Fig. 3. Cladophora tiburonensis, tip of a branch bearing zoospo- 



rangia, x 250. 



Fig. 4. Ectocarpus Hancockii, portion of a filament of the type 

 bearing a plurilocular sporangium, x 325. 



Fig. 5. Ectocarpus sonorensis, portion of a filament of the type 

 bearing a plurilocular sporangium, x 225. 



Figs. 6-7. Ralfsia Hancockii, a paraphysis and a unilocular spo- 

 rangium from the type, x 500. 



Fig. 8. Sphacelaria Flancockii, portion of a filament of the type 

 with a propagulum, x 130. 



Fig. 9. Valoniopsis Hancockii, portion of the type specimen to 



show method of branching, x 10. 



