1*^ Art. 3.— Naohide Yatsu : 



Parenthetically the mode of ingestion may here l)e mentioned. If 

 a piece of fish moat be brought to a tentacle, the latter encircles 

 the piece and contracts. The edge of the oral arras begins to 

 flare out to receive both the tentacle and the meat. After these 

 are drawn into the gastral cavity, the tentacle is slowly pulled out. 

 It is then that the phacellse commence to display their activity. 

 The stalk elongates four or five times its ordinarly length or some- 

 times even more. The terminal tufts are very sticky and also 

 distensive. Some tufts frequently come in contact with the per- 

 radial lip furrow. They glide up and down that fm-row. Often a 

 filament, or two, which are very much stretched out, may be 

 found adhering to the furrow, while the rest of the filaments have 

 already detatched themselves from the gastral surface due to the 

 contraction of the stalk (Fig. ')). 



VI. Summary. 



1. In Charj/bdea rastonll no change in swimming activity is 

 noticeable, if brought in the sun from diffused light. 



2. Whatever position the medusa may assume, the 

 concretion is always at the lowermost end of the rhopalium. 

 Its extraction does not cause any change in swimming 

 activity. 



3. Medusa? deprived of all the rhopalia usually cease to 

 pulsate, but very seldom may perform weak pulsations or even 

 swim for a short distance. 



4. The pulsation center is located in the region of the rhopa- 

 lium between the eye part and the stalk. 



5. In the upper third of the bell and in the region near the 

 velarium the nerve plexus is probably lacking. The nerve stimuli 

 are not transmitted in those regions. 



