of the Fishery Board for Scotland. 



305 



XL — NOTES ON THE ANIMAL PLANKTON FROM H.M.S. 

 ' RESEARCH.' By Thomas Scott, E.L.S. 



This collection, which consisted of twenty-four tow-net gatherings, was 

 contained in twenty-two small bottles : all the gatherings (with one 

 exception) were collected at the surface of the water, in the Shetland- 

 Faroe Channel, at the end of July and the beginning of August last 

 year, by H.M.S. 'Research.' The collections were made by a tow-net 

 made of fine silk bolting-cloth. 



Detailed Description of the Collection. 



1. This gathering consisted of the contents of one haul of the tow-net, 

 collected at the surface at ' Jackal Station No. II.,' lat. 61°45'N. long. 

 0°59'W., on July 30th, 1896, at 10 a.m. (net down 15 minutes). The 

 total contents were equal to about 9 c.c, of which 0*75 c.c. consisted 

 of flocculent matter (Diatoms, Infusoria, Ceratium, etc.), the remainder 

 being composed of larger organisms, chiefly Entomostraca. The plant 

 plankton has been described by Professor Cleve (p. 297). The fol- 

 lowing organisms were observed by me : — 



Calanus jinmarchicus (Gunner). Acartia Clausii, Giesbrecht. 



Pseudocalanus elongatus, Boeck. Oithona (?) similis, Claus. 



Temora longicornis (Muller). Podon intermedins, Lilljeborg. 



The number of Entomostraca in this gathering was, approximately, about 

 3500, and for every 26 Calani there were about 6 Pseudocalani, 32 

 Temorae, and 200 Acartise, while Oithona and Podon were very rare. 



2. This gathering consisted of the contents of one haul of the tow-net, 

 collected at the surface, at the same station as above, and on the same 

 date, at 1 p.m. (net down 15 minutes). The total contents measured 8*75 

 c.c , of which about "75 c.c. consisted of flocculent matter. The following 

 organisms were observed : — 



Calanus Jinmarchicus (Gunner). Acartia Clausii, Giesbrecht. 



Pseudocalanus elongatus, Boeck. Oithona (?) similis, Ciaus. 



Centropages typiciis, Kroyer. Podon intermedins, Lilljeborg. 



Temora longicornis (Muller). Parathemisto (?) gracilipes, Norman. 



Eucalanus elongatus (Dana). Limacina retroversa (Fleming). 



The number of Entomostraca in this gathering was about the same as the 

 last, and the proportion of the species was also similar. There were only 

 one or two specimens of Parathemisto and of Centropages, and one 

 specimen of Eucalanus. Limacina was very rare. 



3. This gathering consisted of the contents of one haul of the tow-net, 

 collected at the surface, at the same station as the other two, and on the 

 same date, at 3 p.m. (net down 15 minutes). 



The total contents of this haul measured 10 c.c, about 1 c.c. consisting 

 of flocculent matter. The following organisms were observed in this 

 gathering : — 



Calanus jinmarchicus (Gunner). Acartia Clausii, Giesbrecht. 



Pseudocalanus elongatus, Boeck. Oithona (?) similis, Claus. 



Euchozta norvegica, Boeck. Podon intermedins, Lilljeborg. 



Temora longicornis (Muller). Parathemisto (?) gracilipes, Norman. 



