318 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



It is not surprising that Outer Loch Hourn should be 

 different in some respects from the Upper Loch, especially 

 when the haul was taken with the large Nansen ; but it is 

 curious that the two hauls in the Upper Loch, both taken 

 with the same coarse-meshed tow-net, in two consecutive 

 quarters of an hour, the one up and the other down the 

 same piece of water, should differ as these do in the case of 

 Temora, Oikopleura, the fish eggs, and the Molluscan 

 larvae. 



Results in 1913. 



We may now put briefly a few general results of this 

 year's observations : — 



We have again to notice the marked absence of phyto- 

 plankton in 1913, as contrasted with the years 1907-1910. 



The most southerly stations (Oronsay and Sound of 

 Islay) were only examined late in August. Calanus was 

 plentiful, also smaller Copepoda, and Evadne was common 

 in Sound of Islay. There are no diatoms, whereas last 

 year the gathering off Colonsay on August 27th was 

 described as "a phyto-plankton with an admixture of some 

 animals." 



The gatherings from the Firth of Lorn area and Sound 

 of Mull show very few diatoms until August. One haul 

 off Lismore on August 26th contains a large amount of 

 RMzosolenia and a few Chaetoceras and Asteriondla. No 

 diatoms were observed at Ardmore on August 11th, and 

 few in Loch Sunart on July 15th. The most marked phyto- 

 plankton in the Nansen gatherings was on August 15th, 

 off Rona Sound. Even this is not a pure phyto-plankton ; 

 it is a mixed plankton, containing a considerable amount 

 of zoo-plankton. The same remark applies to a 

 gathering off South Rona on the following day. The pre- 

 ponderating forms here are oceanic, e.g., Corethron, 

 Chaetoceras criophilum, Ch. decipiens. 



