BIGELOW: COAST WATER EXPLORATION OF 1913. 



309 



The stolon commonly runs along its support nearly in a straight line 

 and it never forms a very complicated network. From the stolon the 

 individual zooids arise, the pedicel being usually rather rigidly erect. 

 In the Grampus material there are hundreds of colonies all of them 

 entirely removed from their support. I say "removed" because one 

 can scarcely conceive of a planula settling down to form a hydroid 

 colony unless it had something on which to settle. As the stolons 

 adhere quite closely to their means of support, they must have been 



Fig. 73. — Clytia cylindrica. 



torn away with some violence so that the stolons were broken in pieces 

 as well. This separation and setting adrift produced complications, 

 to the results of which reference must now be made. 



With the first glance at a mass of this material one is immediately 

 impressed with the fact that there are very few free stolon ends. In 

 colonies collected under ordinary conditions, we can usually see the 

 growing ends of the stolons. Here there seems to be nothing of the 

 kind except in very rare instances. What has happened to them? 

 Again one would suppose that when the colonies were torn away there 



