40 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Dinoflagellates and some diatoms, and was able to supplement 

 and correct the views of previous observers. She found that 

 the organisms in question were more abundant at spring tides 

 than during neaps, that the different organisms remained in 

 their own patches and that there was no alternation between 

 Dinoflagellates and diatoms such as had been described. By 

 having successive samples of sand sent from Port Erin, she 

 was able to exhibit the several forms of Amphidinium alive 

 under the microscope at the Cardiff meeting of the British 

 Association, and, after consultation with Professor Kofoid 

 from California, who is preparing a monograph on the group, 

 it was found that the various shapes which had been supposed 

 to be merely varieties of Amphidinium opsrculatum are really 

 at least three distinct species which are being described by 

 Professor Kofoid as A. herdmani, A. asymmetricum and 

 A. sulcatum, and are all new to our British records. There 

 are also one or more species of Gymnodinium, a Polykrikos, 

 and a few unidentified colourless, naked Dinoflagellates ; but 

 as Miss Herdman is laying before the Liverpool Biological 

 Society a separate paper on her investigation, with figures of 

 the organisms observed, which will follow this report in the 

 volume of Transactions, it is unnecessary to give further details 

 here. 



Algological Investigation. 



Miss Margery Knight, M.Sc, who has made many visits 

 to Port Erin during the past year, and has devoted all available 

 time to a detailed study of the habits and life-history of the 

 common brown sea- weed Pylaiella littoralis, has furnished me 

 with the following short summary of the results of her work : — 



" Pylaiella littoralis is found in abundance, either as an 

 epiphvte on Ascophyllum nodosum, Fucus vesieulosus, Fucus 

 serratus, or growing independently on smooth rocks or stones 

 in the pools at or below 'half-tide level. The plant shows 



