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TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



group is unrepresented in October,* and the numbers 

 keep irregular but low during November, December and 

 January. 



We have taken out separately from the statistics the 

 figures in regard to Ceratium tripos, perhaps the most 

 abundant species of DinofLagellate in our district. It is 



Fig. 6. 



the more important that this should be done since a 

 statement has appeared in a recent Blue-book (Xorth Sea 

 Fisheries Investigation Committee : Second Report 

 (Southern Area) Part I, Cd. 3837, December, 1907, p. 172) 



* That is unrepresented in the series of gatherings from the Manx 

 seas which we are considering ; but members of the group were 

 certainly present in the Irish Sea during the month, as two species of 

 Ceratium were taken by the Lancashire Sea-Fisheries steamer at three 

 Stations East of the Isle of Man, on October 7th. I do not suppose 

 that Dinoflagellates are ever totally absent from the Irish Sea in any 

 month of the year. Gough has recorded (Blue-book, Cd. 3837, 

 p. 263) two species of Ceratium and three species of Peridinium as 

 being rarely, or very rarely, present in the gatherings from the 

 Bahama Bank Lightship in 1904. 



