Plate 16 



Figs. 1-5. Draparnaldia Judaiji Prescott: 1, portion of main axis 

 showing sparsely branched fascicles; 2-4, forms of 

 setae, some of which replace lateral branches of main 

 filament; 5, whorled arrangement of fascicles; all x 500 



Fig. 6. Chaetopeltis orbicularis Berthold: habit on filamentous 



alga, X 440 



692] 



