234 transactions liverpool biological society. 



Noteworthy Species and Hauls. 



There are a few of the species occurring in this years 

 hauls that are of special interest. In the Diatoms, 

 Skeletonema costatum, which had been found in great 

 abundance by George Murray in 1896, in Loch Etive, 

 and which we only met with rarely in previous years, 

 occurs more plentifully in our gatherings this year in the 

 Mull district. Amongst new records we have Nitzschia 

 closterium (Loch Scavaig, Skye), Chaetoceras atlanticum 

 (Moussa Sound) and Pyrocystis lunula (Loch Hourn and 

 Loch Nevis). 



In Upper Loch Torridon, on July 19th, with water 

 of very low salinity (1'018) — due no doubt to mixture 

 with fresh water from the land — we got two remarkable 

 hauls (coarse and fine nets) containing, along with a 



Upper Loch Torridon, 19/7/11 Fine Net. Coarse Net. 



Calanus helgolandicus 6 — 



Pseudocalanus elongatus x — 



Nauplii 10,000 15,700 



Fish eggs — 9 



Oikopleura 136,500 42,000 



Tintinnidae 420,000 388,500 



Ceratium furca x — 



tripos — 5,250 



Peridinium spp 2,052,500 351,700 



Dinophvsis sp. .: 189,000 21,000 



Chaetoceras boreale 1,470,000 1,454,000 



constrictum 1,102,500 141,700 



debile — 241,500 



decipiens 2,782,500 5,076,700 



spp 16,117,500 2,709,000 



Nitzschia delicatissima 334,365,000 328,125 000 



seriata 73,500 36,700 



Rhizosolenia semispina 346,500 871,500 



Skeletonema costatum 84,000 84,000 



Thalassiosira decipiens 378,000 — 



gravida 462,000 771,700 



number of the usual marine Diatoms, an enormous 

 quantity of Nitzschia delicatissima which, we estimate at 



well over three hundred million individuals in each net. 



In this case the size of the mesh seemed to make so little 



difference in the nature and amount of the catch that we 



