150 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 22 



Fig. 1 . Ceramium howellii S. & G. Outline of upper part of a plant to 

 show sparse branching and incurved tips, X 16. 



Fig. 2-4. Ceramium hamatispinum Daws. Fig. 2, A single multicellular spine, 

 X 550; Fig. 3, Outline of apical part of a filament, X 85; Fig. 4, 

 Part of an old filament to show persistent, whorled spines, X 100. 



Fig. 5-6. Ceramium obesum Daws. Fig. 5, A plant from the type collection 

 showing coarse, forcipate tips and rhizoids, X 5; Fig. 6, Longitudinal 

 section through a main axis to show thick cortex, X 55. 



