282 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Finally, we used the lt Mil] " water-bottle on several 



occasions to get samples from three exact depths, with (he 

 following results : — 



Sept, 17th— 20 fat hs. LOfaths. 5 fat lis. 



Total organisms 53 103 10 



Total Diatoms 47 83 2!) 



Total Dinoflagellata 3 12 (i 



Total Copepoda 3 8 ."> 



Chaetoceros teres 1 3 1 



„ densum 2 4 2 



Rhizosolenia semispina 25 37 10 



stolterfothi 12 '26 9 



Coscinodiscus radiatus 1 2 1 



Ceratium furca 1 7 1 



„ fusus 2 3 2 



Sept, 18th— 



Chaetoceros teres 7 1 I 



Rhizosolenia semispina 100 300 200 



,, shrubsolei 1 I 2 



alata '2 4 



stolterfothi ... 1 1 2 



Coscinodiscus radiatus 1 I 2 



Total Dinoflagellata 11 32 9 



Pseudocalanus elongatus ... 3 4 G 



Total Copepoda 7 5 10 



Copepod nauplii 10 20 30 



Sept. 20th— 



Chaetoceros subtile 5 35 130 



Rhizosolenia semispina 125 610 4,200 



,, alata 1 6 40 



shrubsolei 2 10 



stolterfothi ... 1 4 10 



Total Diatoms 132 672 4,470 



Total Dinoflagellata 3 59 30 



Copepod ..auplii 1 18 60 



These results are fairly consistent, and indicate a 

 more abundant fauna in all groups at either ten or five 

 fathoms than at twenty. On the 17th the fauna was at 

 a lower level ; the ten-fathom zone had over twice as much 

 as the others, and the twenty was a little over the five. 

 On the 18th also the fauna at tea fathoms predominated, 

 but that at five fathoms came easily second. On the 20th 

 the five-fathom fauna was much the most abundant and 

 the ten-fathom came n^ext. It seems as if during these 

 days the centre of density was moving slowly upwards. 



These observations should be repeated and extended, 



