in] GREEN CELLS OF CONVOLUTA 77 



In yet another and no less remarkable way, 

 C. roscoffensis exhibits a plant-like character. The 

 bodies of normal, mature animals never contain the 

 slightest trace of food-substances. Though it is 

 kept for days in pure sea-water till any ordinary 

 marine animal would be ravenous, in point of 

 fact most marine animals are always ravenous an 

 adult C. roscoffensis makes no attempt to ingest any 



,-v.a 



- Y.B. 



Fig. 15. The superficial tissues of Convoluta paradoxa. Highly 

 magnified. Y.B. = yellow-brown cells. 



food-substances which may be added to the water. 

 Though tempted with diatoms, green algse, starch 

 grains, oil drops, milk, or lamp-black, it remains with 

 its capacious mouth so pursed up as to be invisible 

 and refuses to ingest any solid food whatever. Till 

 last year it seemed that there was no exception to 

 this fasting habit of adult C. roscoffensis ; but during 



