NOTES ON DINOFLAGELLATES, ETC. 



63 





Diatoms. Brown patches were caused by several species 

 belonging to the genera Navicula, Pleurosigma, and others. 



Oscillatoria sp. ? The only other organism which ever 

 appeared, so abundantly as to cause discolouration was 

 Oscillatoria. This was almost always present in and around 

 the trickle of fresh water in the harbour, and occasionally 

 increased so as to form small dark green patches. (See 

 Sketch Map.) 



Lighthouse . 



f of da**ip «A>\i. 



Oecllitorii. 

 Euglen* l"? sp . 



.npK'*S'*Vt»Tyi A&ymmtlv 

 = A. Sulcatum.. 



■ A he«li-i\*>\.i . 



Polyk.-il.ot. 



