E. W. BERGER ON THE CUBOMEDUS^. 9 



A somewhat similar view seems to be held by other observers and 

 is noted by Lang in his text-book ( " The outer epithelium of the 

 auditory body carries the auditory hairs"). It seems, then, that in 

 functioning as weights for suspending the clubs, they may also serve 

 at the same time for making the pressure of the club against the 

 niche greater than if they were absent, and thus in part serve in 

 equilibrium. On this supposition we should expect, furthermore, that 

 after the removal of the concretions the animal would be little, 

 if at all, affected, since the clubs themselves, without the concretions, 

 would still be of sufficient weight to be influenced by gravity and thus 

 to bear against the walls of the sensory niche. It must be noted, 

 however, that Conant's experiments upon equilibration in Charybdea are 

 negative. Also, that Charybdea has any auditory sense is negatived by 

 two attempts of Conant's with a violin one attempt with the violin 

 near the animals, and another with it in contact with the dish. (From 

 an unpublished note.) Hence, some other word such as sensory or 

 equilibrating should perhaps be substituted for "auditory" in the 

 above quotation. 



Removing the concretions from Aurelia gave negative results very 

 similar to those on Charybdea. (Experiment 42.) 



Sensory Clubs Experiments 12-19, 20, 24. The entire sensory clubs 

 were removed from a number of animals. A paralysis of pulsation 

 followed by a rapid recovery was the usual result. In some instances, 

 however, there was no paralysis, while in others no recovery followed 

 paralysis. This is true in a general way whether one club only or all 

 were removed. While no permanent paralysis followed the removal 

 of one or two clubs, yet permanent paralysis did occur after the 

 removal of a third club, as, of course, also after the removal of a 

 fourth. It is evident, too, that as the removal of the clubs progressed 

 recovery seemed to be weaker after each cutting, except in one case 

 when pulsation seemed to be quickened after the removal of a second 

 club. The pulsations after recovery seemed to be not so strong and 

 regular, often quite feeble, and in one instance in groups. Pieces of 

 tissue with a club attached and pulsating regularly, ceased pulsating 

 after removal of the club, in one instance, however, still giving 

 occasional contractions. 



These results are quite the same as those of Romanes 1 on 

 Aurelia, Cyan^a, etc., and of Eimer IV on Aurelia, Rhizostoma, 



