RADIOLARIA 



95 



Wiesner (1931) in his report on the Foraminifera collected by the 'Gauss' records 

 G. bulloides from 8° 8' S to 66° 2' S. Their observations in the Antarctic lay between 8o° 

 and 89 E, but the species is circumpolar. It was taken in large numbers at Port Foster 

 and elsewhere by the 'Pourquoi-Pas?', was the most common species of the genus in 

 the collection made by the 'Scotia' 1 in the Weddell Sea sector and was universally 

 found in the samples obtained by the 'Terra Nova'. 2 



G. pochyderma is bipolar in its distribution, being regarded as a cold-water variety of 

 G. dutertret, occurring only in the colder water of the Arctic and Antarctic. It was also 

 circumpolar, being collected by the ' Gauss \ 3 ' Scotia ' x and ' Terra Nova '. 2 



Globorotalia (Pulvinulina) scitida does not appear to have been recorded previously 

 in the Antarctic Zone. G. canariensis was taken by the ' Scotia' 1 in the Antarctic and 

 by the 'Terra Nova' 2 but not south of the New Zealand area. 



Radiolaria 



The distribution of the Radiolaria, taken as a whole, is shown in Fig. 45 and 

 tabulated in Appendix II. It is seen that with the exception of stations on the B and D 

 lines (Sts. 126-128 and 135) they occurred in the greatest numbers over the deep water 

 beyond the edge of the continental shelf, rarely being carried into the shallow water. 

 Slightly more were taken on the line between South Georgia and the Falkland Islands 

 in February 1927 than on the line approaching South Georgia from Tristan da Cunha 

 in February 1926. 



Radiolaria were scarce to the east of South Georgia in March 1926, Sts. 13-21 and 

 30-31 ; and also in May 1927, Sts. WS 110-114. 



The vertical distribution of the Radiolaria is shown in Figs. 46 and 47 ; they occurred 

 in the cold Antarctic surface layer, in the warmer intermediate layer and in small 

 numbers in the cold bottom layer. 



Amongst the Radiolaria taken the following families and genera have been recognized : 



AULOSPHAERIDA 



St. WS 21 . 



St. 12 



St. 11 ... 



St. 12 ... 



St. 16 ... 

 St. WS51 

 St. WS 51 



St. q ... 



40 at 500-250 m. 



50 at 250-100 : 



40 at 



40 at 



1 at 



30 at 



40 at 



500-250 m. 

 500-250 m. 

 500-250 m. 

 100-50 m. 

 200-100 m. 



160 at 250-100 m. 



Challengerida 



St. WS 63 

 St. WS 68 

 St. WS no 

 St. WS no 

 St. WS no 



COELODENDRIDA 



POROSPATHIDA 



60 at 



60 at 



240 at 



47 at 



250-100 m. 

 750-500 m. 

 500-250 m. 

 750-500 in. 



120 at 1000-750 m. 



Porospathis sp. 

 St. WS 68 ... 60 at 750-500 m 



60 at 1000-750 m. 



St. WS no 

 Each of these groups was taken by the 'Gauss' (Schroder, 1913) in the Antarctic. 



1 Pearcey (1914). 2 Heron- Allen and Earland (1922). 3 Wiesner (193 1). 



I S-2 



