OF THE KERGUELEN REGION OF THE GREAT SOUTHERN OCEAN. 451 



LIST VI. 



Identical and closely-allied Species found in the Extra-Tropical Regions of 

 the Northern and Southern Hemispheres, and unknown hitherto within 

 the Tropics. 



Frequent reference has been made in the 'foregoing pages to the identity and close 

 resemblance of species recorded from the extra-tropical regions of the Northern and 

 Southern Hemispheres, which, however, up to the present time, are unknown from the 

 intervening tropical zone. For the information of those interested in the subject, the 

 names of the identical and closely-allied species 1 which show this peculiar distribution 

 are brought together in the following lists. 



In the first place we give a list of 90 identical species from the Northern and Southern 

 Hemispheres unrecorded from within the tropics: — 



Monaxonida : 



Axinella erect a. 

 Halichondria mnguinea. 

 Isodictya rosea. 

 Myxilla plumosa. 

 Suberites carnosus. 



Hexactinellida : 



Aulocalyx irregularis. 

 Chonelasma lamella. 



Calcarea : 



Sycon capillosum. 



Actiniaria : . 



Cereus spinosus. 

 Liponema multiporum. 



Corals : 



Flabellum apertum. 



1 For further species known only from north and south of the tropics, and unrecorded from the intervening 

 tropics, which do not come within the scope of this paper, see Challenger Report, Summary of Results, pp. 1446-1449. 



