CHAETOGNATHA AND POLYCHAETA 



113 



Table XVIII 



The depth distribution of Sagitta gazellae as shown by the N 70 V nets 



Table XIX 

 The depth distribution of Sagitta maxima as shown by the N 70 V nets 



POLYCHAETA 



Of the planktonic Polychaeta Pelagobia longicirrata, Greeff , and species of Tomopteris 

 were the outstanding forms. 



Pelagobia longicirrata had a very general distribution throughout the area (Fig. 52) ; 

 its numbers, together with those of young Polychaeta which in most instances were 

 the young of Pelagobia, are recorded in Appendix II. It occurred in slightly larger 

 numbers to the west of South Georgia than to the east. In depth it extended down 

 to below 750 m., but was most abundant at levels between 250 and 50 m. 



This species was taken on thirty-six occasions from below the ice at the winter quarters 

 of the National Antarctic (Discovery) 1 Expedition, also in thirty-six plankton samples 

 in the Antarctic by the ' Gauss'. 2 It is a cosmopolitan species. 



Tomopteris had also a very general distribution but was rarely abundant. 



1 Ehlers (19 12). 



2 Ehlers (1913). 



