HIE ASSOCIATION OF A FISH WITH A HYDRO ID. 



77 



cavity <>f the hydranths shows the feeding processes to be those 

 nt' a mm-par, i-iiic species. 



At frequent intervals branches, 3 to 4 mm. in height when fully 

 <|r\rl"pr<l. spring from this root system and each i> terminated 

 by a -hvje hydranth. In no case does a hydranth arise as a 

 lateral bud l'n>m the hydrocaulus, as in P. vestitus, for example. 

 ( )n i he (i In -r hand, the medusa buds almost invariably appear as 

 . verj rarely closely associated pairs of out^n-wth- <li-- 



2. Portion of hydroid colony (P. pugetensis). 



IK.-. -.1 at comparatively regular intervals along the stem. Thnr 

 order <>! appearance is seemingly not so definite, though this, in 

 part at least, is perhaps due to the escape of an unknown number 

 of mediae fn.in the older stems. On the shorter, younger 

 branchr- one bud appears usually in the vicinity of the ba-e. or 

 tin- hydranth, and about the time its development is half way 

 compli-trd a >econd one arises in the middle section of the stem, 



