CLADOCERA— PODON 37 



PODON INTERMEDIUS Lilljeb.^ 

 (P. E. Mull. Naturh. Tidskr. 3:dje Reekke, Vol. V 1868, PI. 5 fig. 22, VI fig. 1-4.) 



1898 April: 50° N. 3° W. 

 July: 59° N. 13° W. 



August: 56° N. 13° W.; 61° N. 8° W. to 60° N. 3° W.; West- 



mannao. 

 September: 56°— 57° N. 12°— 14° W.; 60° N. 4°— 3° W.; 70° N. 



21° E. (Auriv.) 



1899 August: 54° N. 18° W., not rare. 

 September: 56° N. 17° W., not rare. 



Temperature: 12.3, mean of 13 obs., max. 14.4, min. IO.2. 

 (According to Aurivillius 14.) 



Salinity: in the Atlantic 35.42, mean of 11 obs. max. 35.56, 

 min. 33.80 (in the Skagerak 21, Aurivillius). 



Plankton-type. This species is found in the Adriatic and 

 Mediterranean, on the west coast of France, off the British Islands, 

 the coast of Norway, in the North Sea, the Skagerak, the Baltic, at 

 least to 63° N. (Hansen, Aurivillius). Evidently a neritic form of the 

 eastern temperate Atlantic. — Nm. 



PODON POLYPHEMOIDES Leuck. 

 (P. miniitus de Guerne. Bull soc. zool. de France vol. XII 1887.) 

 1898 December: 46° N. 50° W. 



Temperature: 13—14 (Aurivillius). 



Salinity: 21 (Aurivillius). 



Plankton-type. Found off Auckland, in the Gulf of Guinea, 

 the Mediterranean and Black Sea, off the west coast of France, in the 

 southern North Sea, the Skagerak, the Baltic to 66° N., off Norway 

 to Lofoten (Hansen, Aurivillius). Evidently a neritic form living on 

 the eastern coasts of the warmer Atlantic. — Nm. 



Ostenfeld's data used. 



