MARINE BIOLOGICAL STATION AT POUT ERIN. 



85 



fluid. Amongst the rarer of the large Medusae which 

 enter Port Erin Bay there is one (Pelagia perla) which is 

 marvellously phosphorescent, glowing in the water like a 

 ball of incandescent metal. 



Sea-anemones are abundant and varied round the 

 South end of the Isle of Man. An anemone usually 

 consists of a column-like body, attached by its base to 



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/ 



Fig. IV. 



Medusae (top central figure one-fourth natural size, 

 the rest all enlarged about ten times). 



rock or stone, its free end forming a rounded disc fringed 

 with several circlets of tentacles, and having an oval 

 mouth in the centre. The mouth opens into a short tube 

 or gullet, and this again into a spacious digestive cavity. 

 The tentacles are charged with stinging threads (like 

 those of the Medusae), with which the animal paralyzes 

 its prey. Anemones are voracious feeders, and by means 



