358 transactions liverpool biological society. 



Lochs on Mainland North of Skye. 



We have five gatherings from Loch Torridon, all 

 taken on August 15th : — A vertical haul from 50 fathoms 

 and a surface haul in the Outer Loch; two 

 vertical hauls (35 and 70 fathoms) from the branch 

 known as Loch Shieldag; and a surface gathering from 

 Upper Loch Torridon, beyond the Narrows or " Kyle." 

 The last of these is mainly a phyto-plankton, but not a 

 very large or marked one. Its main Diatom constituent 

 is the oceanic Rhizosolenia semispina, but it also 

 contains the neritic Rhizosolenia shrubsolei. This 

 gathering then is not so striking as the one taken on 

 July 19th, 1911, in Upper Loch Torridon, when the 

 Diatoms very markedly predominated, and we had 

 over three hundred million individuals of Nitzschia 

 delicatissima in each of two nets hauled simultaneously. 



The other four hauls taken this year in the Torridon 

 district were all of much the same character, oceanic 

 zoo-plankton with a comparatively small amount of 

 oceanic phyto-plankton. Practically the only neritic 

 organisms present in all these hauls are some Tintinnidae. 

 We print the details of the vertical haul from 70 fathoms 

 in Loch Shieldag as a specimen. 



L. Shieldag (Loch Torridon). August 15th, 1912. 35 fathoms. 



Calanus finmarchicus 300 



Pseudocalanus elongatus 3,450 



Oithona similis 2,900 



Metridia lucens 20 



Nauplii 3,100 



Thysanoessa raschii 4 



Sagitta bipunctata 10 



Tintinnidae 1,250 



Peridinium spp 7,800 



Cosoinodiscus radiatus 300 



Nitzschia closterium 625 



Rhizosolenia semispina 10,000 



