EK. W. BERGER ON THE CUBOMEDUSA. 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an unpublished note.)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' on 
Aurelia, Cyanza, etc. and of Eimer'Y on Aurelia, Rhizostoma, 
