262 



DISCOVERY REPORTS 



THE MATERIAL EXAMINED 



The plankton samples of the first survey were taken on a series of three transverse lines of stations 

 across the Benguela current off the coast of South-west Africa (Fig. i). 1 These samples were taken 

 with a series of vertical closing nets of the N 70 pattern shot to a maximum depth of 1000 metres or 

 less, depending upon the depth of water at the station. The soundings show that the outermost 

 station of each line was in a depth of water of some 2000 m. or 3000 m., while the lines then proceeded 

 up the Continental Slope, a few stations in each being over the Continental Shelf. 



20 



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Fig. 1. Sketch-map of the area off the west coast of Africa where samples were taken, 

 showing the approximate positions of the stations. 



SPECIES PRESENT IN THE SAMPLES 

 Conchoecia rotundata Miiller aff. 



Skogsberg (1920) pointed out that the species C. rotundata as described by Miiller (1906) is probably 

 a mixture of closely allied species, and the material from the Benguela current has made it possible 

 to confirm this hypothesis. 



Miiller (1890) described the species C. rotundata on the basis of a few specimens obtained in deep 

 water at two positions in the tropical Pacific. These were in 13 N., 120 W. at a depth of 1000 m., 

 and in i° S., ioo° W. at 4000 m. (According to Schott (1935, pp. 199-203) the temperatures at 

 1 Particulars have now been published in a new Station List in the Discovery Reports. 



