SEA-FISHERIES LABORATORY. 355 



A pair of hauls, one vertical and the other surface, 

 from some ten miles further north, off the Island of 

 Muldoanich, on August 6th, gave much the same 

 evidence. The vertical haul, from 107 fathoms, is 

 mainly oceanic zoo-plankton, although Tintinnidae and 

 the neritic Diatom, Rhizosolenia shrubsolei, are repre- 

 sented. The haul contains, however, the characteristic 

 oceanic forms, Metridia lucens and Cwpulita sarsi, and 

 abundance of Calami s finmarchicus . 



The surface gathering on the same day, five miles 

 east of Muldoanich, does not show either Metridia 

 lucens or Cwpulita sarsi, and has very few Calanus 

 finmarchicus. Like the corresponding haul the 

 following day, off Bernera, it represents both phyto- and 

 zoo-plankton, mainly oceanic in type. We may expect 

 that even in water that is oceanic, when it approaches 

 a coast there will, no doubt, be a certain admixture of 

 neritic organisms derived from the animals and plants 

 of the shore. 



August 6th, Castle Bay, Barra. This gathering 

 agrees fairly well with that taken on July 12th, 1910, 

 in Vatersay Sound, which is simply the channel through 

 to the Atlantic at the mouth of Castle Bay. In each 

 case there is a mixture of zoo- and phyto-plankton and 

 of oceanic and neritic types. In the present year the 

 neritic diatoms were perhaps rather more in evidence 

 than on the former occasion. The difference in date, 

 nearly a month later this year, must be borne in mind. 



Continuing up the line of the Outer Hebrides, in 

 waters that had not been examined on any of our 

 previous cruises, we had a vertical haul on August 8th, 

 from 102 fathoms, two miles off the Binch Buoy to the 

 east of the Island of Eriskay. This gathering was 

 mainly zoo-plankton, and was certainly oceanic in type. 



