On the Nervous System of Cassiopea Xamachana. 



151 



from which arms and stomach had been removed, or half-disks. Besides, 

 on account of the relative activity of the zooxanthellse (symbiotic algae), 

 the rate of starvation differed greatly when the experiments were carried 

 on in the diffuse light of the laboratory or in darkness. 



TABLE 7. Record for to 4 days. 



[Twenty disks to show the differences in loss of weight between active and activated 



half-disks.] 



In these experiments, where the disks were prepared by one of the 

 three types of operations previously described, there was no necessity 

 for taking precautions to remove the normal food materials from the 

 water. Water from the regular laboratory supply pumped through 

 vulcanite pipes by a vulcanite pump was regularly used, as no difference 

 was found when water brought in glass jars from the ocean was used. 



