232 transactions liverpool biological society. 

 Comparison with Previous Years. 



We have no data this year represent in (if the Clyde 

 Sea-Area, but can deal with all our previous localities 

 north of Cantyre, as follows : — 



Firth of Lorn. 



Half a dozen hauls, ranging between Sheep Island 

 and the Lynn of Morven — mixed hauls, but on the whole 

 more zoo^^lanktonic than in previous years. The Diatoms 

 are mainly neritic. A haul taken off Lismore on July 

 10th is the only purely jjhytoplanktonic gathering in this 

 series, and contains about tifteen millions of Chaetoceras. 

 The rest of the hauls from this district were taken a 

 couple of weeks later between the 24tli and 26th of July, 

 and it is quite likely that their more zooplanktonic 

 character is due to the seasonal disappearance of the 

 phytoplankton. 



North End of Sound of Mull. 



Hauls at Tobermory show much the same characters 

 as in previous years, but one off Ardmore, on July 11th, 

 j)resents a striking difference as it is almost a pure zoo- 

 plankton, the Diatoms which were present to the number 

 of over 40 millions per haul the previous year being 

 represented now by only a very few Chaetoccr<is and 

 (Joscinodiscus, about IGOO in all. The details of tlie 1!)10 

 and 1011 hauls at this locality are given below for com- 

 parison. It was here, this year, that we first met with 

 the Pteropods [Limac'ma rctrovcrs(t) which were so 

 abundant from lliis point onwards U]) (o tlic ()ilcnc\s. 



Hebrldean Sea and Round the Small Islands. 



Fifteen hauls represent this area, and on the whole 

 they are more zooplanktonic than in ])i('vi()us years, and 

 show a change in the nature of tlic iew Diatoms present, 



