520 DEPTHS OF THE OCEAN 



pycnogonids or sea-spiders, Colossendeis proboscidea in particular 



Fig. 361. 

 Trochostotna boreale, M. Sars. Reduced. (After Danielssen and Koren. ) 



being immense, though Nyfuphon robusttwi (see Fig. 364) is the 

 most numerous and characteristic 

 species of the cold area, and is 

 easily recognisable by its semi- 

 circular prehensile organs, resem- 

 bling fingers which incline towards 

 one another. The higher crus- 

 taceans consist entirely of shrimp- 

 like forms, such as Sclerocrangon 



Fig. 362. 



Pourtalesia Jeffrey si, Wy. Thoms. 



(After Wyville Thomson. ) 



ferox{sQ.e. Fig. 365), Bytkocaris, and 

 Hymenodora glacialis (the last of 

 which is also found pelagic in the 

 deeper water-layers), whereas crabs 

 are very poorly represented in the 

 arctic areas. On the other hand, 

 the lower crustaceans, especially 

 isopods and amphipods, occupy a 

 very prominent position among 

 the fauna of the Norwegian Sea 

 deep basin, as there are numbers 

 of species, and several attain to considerable size, 



Fin. 363. 

 intedon eschrichti, ]. Mliller. 

 (After Stuxberg. ) 



One of the 



