SEA-FISHERIES LABORATORY. 353 



Three surface hauls taken this year rather further 

 out, off "The Cailliaeh" at the N.W. comer of Mull 

 and between the north of Mull and Ardnamurchan, 

 showed an oceanic zoo-plankton. Shear-net hauls 

 obtained on the same days (August 22nd and 23rd) off 

 the north coast of Mull, off Ardnamurchan and to the 

 S.E. of the Island of Muick, also showed an oceanic 

 zoo-plankton containing many specimens of the pelagic 

 Tunicate, Doliolum tritonis, a notably North Atlantic 

 organism. The vertical haul taken on August 19th this 

 year off Muick Island was likewise of the same nature, 

 almost wholly zoo-planktonic of an oceanic type, and 

 containing some specimens of Doliolum tritonis. 



A small surface gathering taken on August 23rd to 

 the S.E. of Muick was composed wholly of oceanic 

 organisms, with the exception of a few individuals of the 

 Cladoceran, Evadne nordmanni. 



We have had no gatherings in previous cruises in 

 quite this same region off Ardnamurchan and between 

 the north of Mull and the southernmost of the 

 small isles, with which the above hauls can be compared. 

 Further north, however, round Eigg and Canna, some 

 phyto-planktonic samples were obtained in 1910. This 

 year, at any rate, the Atlantic water carried oceanic 

 organisms as far in as the channel between Mull and 

 Ardnamurchan. 



Outer Hebrides. 



Most of the localities in this region were new ground 

 untouched in our former cruises. 



A vertical haul on August 7th, S.E. of Barra Head 

 Lighthouse on the Island of Bernera, the southernmost 

 of the Outer Hebrides, is the deepest (145 fathoms) in 



