362 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Copepoda were in the deeper layers of water. These are 

 more like the types of haul that we obtained in July, 

 1909 and 1910, at the northern end of the Sound of 

 Mull, off Ardmore ; but the present hauls are smaller in 

 quantity. A haul of the shear-net taken in the same 

 locality, off Ardtornish, near the southern end of the 

 Sound of Mull, showed a small zoo-plankton. This is, 

 of course, quite consistent with the two mainly phyto- 

 planktonic hauls obtained at the same time with the 

 much finer-meshed nets. It only means that the 

 Diatoms passed through the large meshes of the shear- 

 net, which therefore showed only the comparatively few 

 larger animals (Calanus, and some other Copepoda, 

 Sagitta, Medusoids and Decapod larvae) that were 

 present with the phyto-plankton. The shear-net, more- 

 over, corroborates the evidence of the vertical haul that 

 the Copepoda were chiefly in the deeper water. 



Sound of Jura. 



Our last locality is at the upper end of Loch Swen, 

 where we have two surface hauls in the neighbourhood 

 of Tayvallich taken on August 28th. Both show well- 

 marked phyto-plankton of neritic type, with in each case 

 a few oceanic Copepoda added. Between the two, at 

 least a dozen species of Diatoms are present in abundance. 



Two hauls of the shear-net taken in Loch Swen on 

 the same day, one to the south of Tayvallich and the 

 other to the north, both show small hauls of zoo- 

 plankton. The explanation is the same as we have given 

 in the case of the shear-net haul in the Sound of Mull 

 on August 24th. The fine phyto-plankton has all passed 

 through the wide meshes of the shear-net, and only the 

 coarser zoo-plankton which was present in relatively 

 small quantity has been retained. Moreover, the shear- 



