

Figs. 1-4. Fig. i — Monostroma angicavum., zygospore Vv'hich has produced 

 zoospores. (X 650) From Yamada and Saito, 1938. Fig. 2 — Codio- 

 lum gregarium, habit of plants. (X 30). From Newton, A handbook 

 of the British seaweeds, 1931. Fig. 3 — H alley stis ovalis, fertile plant 

 liberating gametes. (X about 2.3). Fig. 4 — Derbesia marina, a. por- 

 tion of thallus; b. sporangium containing zoospores; c. zoospores, (a, 

 X about 24; b, X about 245; c, X about 485). Figs. 3, 4 — from Smith, 

 Cryptogamic botany, Vol. i, 1938. 



