99 



7 Scarlet Madrepore 



(from Ilfracombe) 



3 Cloak Anemone 



Balanophyllia regia 



Adamsia palliata 

 Tlius there were nearly a hundred animals in this 

 Tank ; a number which I found far too great ; for 

 though they did not crowd the vessel at all apparently, 

 nor seem disproportioned to the space they occupied, 

 it became evident that the exhaustion of the oxygen 

 of the water went on more rapidly than it could be re- 

 newed, either by the evolution from the living plants, 

 or by the combination with this of artificial aeration, 

 by allowing two or three gallons a day to drip from a 

 vessel suspended over the Tank at the height of about 

 four feet. 



For about ten days the animals appeared pretty 

 well ; a little diminution occuning from the assaults of 

 the predatory species on their weaker fellows. Then 



h2 



