90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 11 



Fig. 30. Cliaeto< eras cm -vis ft us CI. Kroad girdle view of chain. 

 30a. Narrow girdle view of chain. 

 30b. Broad girdle view of chain \vith two resting spores. 



Fig. 31. Chaetoceros debilis CI. 



