OF THE KERGUELEN REGION OF THE GREAT SOUTHERN OCEAN. 401 



Total Number of Species of Marine Metazoa procured by the Challenger in the 

 Southern Hemisphere South of the Tropics, in Depths exceeding 1000 Fathoms. 



If now we combine the information in the two preceding lists (Lists I. and II.) of 

 species taken by the Challenger in the two groups of deep-water Stations to the south of 

 the southern tropic, we shall have a fair general idea of the deep-sea Metazoan fauna 

 of the Southern Hemisphere in depths over 1000 fathoms so far as at present known. 



There are in all thirty-seven Stations, at twenty-nine of which the trawl was used, and 

 the dredge was sent down at the remaining eight Stations. 



15 of the Stations are situated in the South Atlantic or its extension into the 



Southern Ocean, 

 14 ,, ,, South Pacific or its extension into the 



Southern Ocean, and 

 8 ,, ,, Southern Indian Ocean (Kerguelen Eegion). 



The total number of species obtained is 523, belonging to about 312 genera, the 

 proportion of genera to species being as 1 to 1*67. 



272 species (or 52 per cent, of the total number) occur in the Kerguelen Region, 

 194 ,, ( „ 37 ,, ,, ,, ) occur in the South Pacific, and 



138 ,, ( ,, 26 ,, ,, ,, ) occur in the South Atlantic. 



These figures show that in the eight deep-water Stations of the Kerguelen Region, a 

 much larger number of species was procured than at nearly double the number of Stations, 

 situated, however, nearer the tropics, in the South A.tlantic or in the South Pacific. 

 Of the 523 species obtained we find that 

 164 species (or 31 per cent, of the total number) are known only from the Kerguelen 



Region, 

 89 ,, ( ,, 17 ,, ,, ,, ) are known only from the South 



Pacific, and 

 54 ,, ( „ 10 ,, ,, ,, ) are known only from the South 



Atlantic. 



There are, in addition, 29 species (or 6 per cent, of the total number) which, though 

 not confined to any one of these three divisions, are known only from these deep-water 

 Stations of the Southern Hemisphere south of the tropic of Capricorn ; of these 29 species, 



20 species are common to the Southern Indian and South Pacific areas, 

 5 ,, ,, „ „ South Atlantic areas, 



3 ,, „ South Atlantic and South Pacific areas, 



1 ,, ,, to all three divisions (South Indian, South Atlantic, and 



South Pacific). 



