INVERTEBRATE BOTTOM FAUNA 



539 



P. nanus, NepJiropsis atlantica. Molluscs: Dentaliuni caudani and others. 

 Sponges : Pheronema carpenteri (see Fig. 383). 



Fig. 381. 



S/epkanotrochus diadema, Moseley. " Michael Sars," 1902, 750 metres. 



This list is very far from complete, but it shows what a number 

 of forms there are which do not belong to the Norwegian Sea. 



ir 



|.i4.iif 



Flabellum sp. 



Fig. 382. 

 Michael Sars," 1910, Station loi, 1853 metres. 



Besides these specifically Atlantic forms, the fauna on the 

 southern slope of the ridges and plateaus comprises others 

 familiar to us from the boreal region of the Norwegian Sea, 

 and from the North Sea, where they occur either on the plateaus 

 or in the deeper parts of the fjords. Including : — 



