THE REGENERATION OF GON1ONEMA. 



canals and several bulbs had formed in other specimens. Quite 

 a large number of bulbs were present ; in some cases thirty were 

 counted, while in others as many as forty were found. These bulbs 

 are probably an aggregation of new tissue and do not represent 

 the bulbs usually found at the bases of mature tentacles, as these 

 latter normally form after the tentacles have been regenerated. 

 In Fig. 2 the marginal canal and bulbs are shown. From several 

 of the bulbs elongations resembling young tentacles had formed. 

 Specimens were kept two weeks after the bulbs were first found 

 and though the bulbs increased from two or three to twenty or 

 forty the tentacles did not develop beyond what is shown in Fig. 2. 



FIG- i. 



FIG. 2. 



In the third set the margins contracted somewhat, but on the 

 second day all evaginated and in some cases the bell began to 

 degenerate. One of the specimens turned right side out and 

 twelve hours later evaginated again and then gradually disin- 

 tegrated. All the specimens died before any regeneration took 

 place. In the fourth set all died within a week without having 

 regenerated. One specimen flattened out and attached itself to 

 the bottom of the dish by the manubrium. Several of them 

 evaginated and in all the bell slowly disintegrated and the medusae 

 soon died. 



The fact that in these two sets nearly all evaginated and all 

 died within a week, and that this happened only in this experi- 

 ment, needs some further explanation. The same care and 

 methods were used in this experiment as in all others, with the 

 exception that in the third set the water was taken from the tap 



