391 



Notes on the Hydroids of Plymouth. 



By 



Gilbert C. Bourne, M.A., F.L..S. 



With Plate XXVI. 



Ddrinq the two years which I spent at Plymouth I collected a 

 number of notes on the occurrence and distribution of the Hydroidea 

 of the district, with the intention of giving a full account of the 

 representatives of the group in the Plymouth area. My unexpected 

 departure has prevented my carrying out this intention, but it has 

 seemed to me worth while to publish my notes, fragmentary as they 

 are, in the hope that they may be useful to my successors, and par- 

 ticularly because the list of the Hydroidea given in Part ii of the 

 first series of this Journal is very imperfect. The list of species 

 now given is incomplete, and had I had the time to search more 

 closely for the inconspicuous and deep-water forms I should have 

 been able to add largely to it. One species, which I only succeeded 

 in obtaining twice, appears to be new to science. 



Gymnoblastea. 



Family CLAYIDyE. 



Clava multicornis, Forskdl. 



This well-known species is very common in tide pools on the 

 rocks below the Hoe, and inside Penlee Point. I have also found it 

 in Wembury Bay. 



Clava coenea, T. 8. Wright. 



A small colony with ripe gonophores growing on Fucua serratus. 

 Drake's Island, February 11th, 1888. 



