72 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Then, again, the autumnal phyto-plankton increase 

 was greater than usual. I happened to be at Port Erin 

 in the latter part of September and took some of the 

 larger Diatom gatherings myself, and I do not think I 

 had ever before seen the water in the Bay swarming so 

 thickly with Diatoms (chiefly species of the genus 

 Chaetoceras) . The phyto-plankton remained in quantity 

 up till the end of the month, and gradually disappeared 

 during the early days of October. 





Fig. 16. Diatom Plankton, consisting mainly of Rhizosolenia semispina. 



Extended West Coast Investigation. 

 In our extension of the plankton investigation up the 

 West Coast of Scotland, in addition to visiting many of 

 our former localities in the sea-lochs and around the 

 inner islands, we took observations from the yacht along 

 the chain of the Outer Hebrides, from Barra Head in 

 the Atlantic, at the southern extremity, to Stornoway in 

 the north. Frequent tow-net gatherings were taken, 

 both at the surface and also vertically, with the Nansen 

 net attached to the Lucas sounding machine, many of 

 them from depths of over 100 fathoms, the deepest this 

 year being 145 fathoms off Barra Head. The detailed 



