MARINE BIOLOGICAL STATION AT PORT ERIN. 45 



is very constantly infested with a bright brick-red Cap- 

 rellid. 



Amongst the Opisthobranchiate Mollusca obtained at 

 Port Erin during the year are : — Elysia viridis, var. 

 olivacea, Actceonia corrugata, Pleurobranchus plumula, 

 Eolis coronata, E. angulata, and E. drummondi ; also 

 Gratena concinna from Leasowe, near Liverpool, on 

 Sertularians. 



Some experiments were made during the summer at 

 the laboratory with the gregarious Ascidian Polycarpa 

 glomerata from the sugar-loaf caves, with the view of 

 determining the functions of the atrial tentacles found iD 

 this and a few other species. Athough some results have 

 been obtained, I hope to make the investigation more 

 complete by further experiments before publishing an 

 account. 



The large buoy, which is moored at the entrance to the 

 Bay, off the end of the broken breakwater, underwent its 

 annual cleaning and tarring on May 26th. Fortuna- 

 tely Mr. E. T. Browne, who was then working at the 

 Biological Station, was present on the occasion, and he 

 found when the buoy was turned over that the flat bottom, 

 about five feet in diameter, was completely covered with 

 animals and sea- weeds, especially the former. The 

 following were taken : — Sycandra compressa (very large), 

 S. ciliata (fine clusters), Antedon rosacea (a dozen), 

 Eucratea chelata, Scrupocellaria reptans, Gaprella linearis, 

 Eolis coronata, Mytilus edulis, Ciona intestinalis and 

 Ascidiella scabra (up to 5 cm. in length). 



It is interesting to get here such forms as Antedon, the 

 Polyzoa and the Ascidians which are usually found in 10 

 to 20 fathoms off Port Erin. All the specimens taken 

 were characterized by their fine and luxuriant growth, 

 and all must have become attached since the cleaning of 

 the previous summer. 



