402 DR MURRAY ON THE DEEP AND SHALLOW-WATER MARINE FAUNA 



Of the 523 species present in these deep-water Stations of the Southern Hemisphere 

 there are thus altogether 336 species (or 64 per cent.) which, so far as our knowledge at 

 present extends, are unknown outside the area represented by these deep-water Stations. 



Besides these 336 species known only from deep water in the Southern Hemisphere 

 south of the southern tropic, there are 28 species (or 5 per cent, of the total number 

 present) not known to occur to the northwards of the southern tropic, but occurring in 

 shallower water less than 1000 fathoms in southern regions. 



There are 121 species (or 23 per cent, of the total number) which extend to regions 

 north of the tropic of Capricorn, and their distribution outside this area may be 

 shown thus : — 



43 species (8 per cent.) occur to the north of the tropics (but not within the tropics), 



41 ,, (8 ,, ) ,, both within and north of the tropics, 



37 ,, (7 ,, ) ,, within the tropics (but not north of the tropics). 



These 121 species are represented in the various oceanic regions as follows : — 



62 species 



49 



37 



36 



7 



4 



or 12 per cent.) occur in the North Atlantic, 

 9 „ ) ,, Tropical Pacific, 



7 ,, ) ,, Tropical Atlantic, 



7 ., ) ,, North Pacific, 



1 „ ) ,, Indian Ocean, 



1 ,, ) ,, Arctic Ocean. 



As regards the bathymetrical distribution of the species taken at these deep-water 

 Stations of the Southern Hemisphere, 336 species, as already stated, are known only from 

 these Stations, and are consequently known only from depths over 1000 fathoms. Of 

 the species with a wider distribution, 54 species are known only from deep water 

 over 1000 fathoms, making a total number of 390 exclusively deep-sea species (or 74 per 

 cent, of the total number present). The remaining 93 species occur both in deep water 

 over 1000 fathoms and in lesser depths, of which 39 species have been recorded from 

 shallow water under 150 fathoms, 4 of which are known from the shore. The depth ;;t 

 which 2 species occur outside the area under consideration is not recorded. 



Of the 312 genera represented at these deep-water Stations, 57 genera (or 18 per 

 cent.) are known only from these Stations, and there are, besides, 3 genera which are 

 known, apart from these Stations, only from shallower water south of the southern 

 tropic. 



