62 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



for this — possibly environmental and connected with the 

 drainage of water from the upper part of the beach 

 during low tide — but we have as yet failed to determine 



Fig. 8. Beach at Port Erin, showing Aniphidinium patch at x. 



it with any certainty. We are under the impression, 

 moreover, that the Amphidinium patches are more 

 prevalent during neaps than at spring tides. This 

 might be the result of increased dampness on the beach 

 when the tide is out, due to the sea-water in the sand not 

 sinking so far below the Amphidinium level. 



The history, then, of Amphidinium on the beach in 

 1912, so far as our observations show, is as follows. 

 Some of the dates are only approximately correct : — 



April 1—12 

 April 13—15 

 April 16—20 

 April 21—23 

 April 24—27 



Amphidinium 



Diatoms 



Amphidinium 



Diatoms 



Amphidinium (traces only) 



