E. W. BERGER ON THE CUBOMEDUS. 29 
one stopped pulsating apparently for good upon removing the third 
club. 
17. All four sensory clubs were removed from one, cutting as 
high up as possible so as to remove the endodermal tract of nerve 
fibers of the peduncle. It pulsated afterwards apparently the same 
as if the stalks had been left intact. 
18. A small piece surrounding a sensory club and including the 
margin can contract by itself. The piece observed pulsated with 
quick pulsations and rhythmically but intermittently. After a fresh 
cutting away of such a piece, the portion of the velarium attached 
was seen to contract rhythmically, while the rest of the swbumbrella 
was not so seen. The part of the subumbrella above the radial 
ganglion that was cut off did not contract by itself. The same 
portion of the velarium cut off did give contractions. 
19. A sensory club with the surrounding region cut out pulsated 
rhythmically; when the club was cut from the end of its stalk 
pulsation stopped. This observation was repeated on another, and 
contractions were seen after the removal of the club. A piece of 
the subumbrella wall from the same’ animal gave contractions now 
and then even after an hour. 
20. The normal position of a sensory club seems to be with 
the concretion almost at the lowermost end; often with it certainly 
lowermost, but probably oftener with the perpendicular passing 
through the center of the attachment of the club to its peduncle 
and just by the inner edge of the concretion. The eyes point inwards. 
When the animal is on its side the concretions are always quite 
lowermost. When the animal was inverted the tendency was for 
the concretions to be lowermost. In this position the eyes may 
point in several directions. In one instance those of one club pointed 
rather outwards, while of two other clubs they pointed more in the 
plane of the body wall. (See also Experiments 24, 29.) 
Nerve.—21. Cutting the nerve eight times, once on each side of 
each sensory club, produced no loss of coordination in pulsating. 
The animal was weakened, however, by the operation, which was made 
drastic to insure cutting the nerve; but it was still able to swim. 
This experiment was repeated four times. 
22. That coordination was continued after the nerve was cut 
was proved beyond doubt by cutting from the edge up (eight times) 
