178 COLLINS AND HERVEY. 



PLATE IV. 



Ceramothamnion Codii H. M. Richards. 

 FiGUBE23. Union of three rhizoids from different nodes. 310X1. 



Dasya spinuligera Collins & Hervey. 



FIGURE 24. Branch with ramelli and young and mature stichidia. 120 X 1. 

 FIGURE 25. Cross section of branch. 160 X 1. 



Gymnothamnion bipinnatum Collins & Hervey. 



FIGURE 26. Prostrate filament with two erect and two descending axes. 

 300 X 1. 



Ceramium cruciatum Collins & Hervey. 



FIGURE 27. Prostrate filament with rhizoids and base of erect filament. 



65 X 1. 

 FIGURE 28. Branch with tetraspores. 120 X 1. 



