MARINE BIOLOGICAL STATION AT PORT ERIN. 21 



Whilst collecting large white anemones for this and 

 similar work, Dr. Roaf found a specimen (see fig. 4) 

 which was nearly divided into two distinct anemones. The 

 mouth-discs and circles of tentacles are absolutely 

 separate, but the two bodies join about two-thirds of the 

 way up from the base. This is probably a case of 

 partial fission, such as is known to occur sometimes in this 

 and other anemones. G. H. Parker has described it in the 



Fig. 4. — Specimen of Actinuloba diantkus showing fission. 



American Metridium marginatum, and Dr. J. A. Clubb 

 found the same in a Metridiun/ (Actinoloba) from the 

 Mersey, which completed its longitudinal fission in the 

 tanks under Ins observation. Dr. Roaf found that when 

 one mouth wns led with neutral-red stained food, the neigh- 

 bouring tentacles became pink and remained coloured for 

 four weeks, while those ground the other mouth remained 

 white. When on<' disc wae stimulated the tentacles ol 

 thai pari contracted, and those of the other only followed 

 more slowly after ;• Blight interval, probably as a result 

 of a secondary stimulation caused by the contracted state 



