OF THE KERGUELEN EEGIOX OF THE GREAT SOUTHERN OCEAN. 451 



LIST VI. 

 IDE^TICAL AXD CLOSELY-ALLIED SpECIES FOrXD IX THE ExTRA-TrOPICAL EeGIOXS OF 



THE Northern and Southern Hemispheres, axd ixkxoavn hitherto within 

 THE Tropics. 



4 



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

 resenfblance 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 * which show this peculiar distribution 

 are brouo-ht 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 : 



Axindla erecta. 

 Halichondria sanguiiwa. 

 Isodictya rosea. 

 Myxillci plumosa. 

 Subei^tcs ca niosus. 



Hexactinellida : 



A idoccdyx irregularis. 

 Chonelasma lamella. 



Calcarea : 



SycoH capdlosum. 



ACTIXIARIA : 



Cereus spinosus. 

 Liponema mnltiporum. 



Corals : 



Flahelliiin apertuin. 



' For fuitlit'i- species known only from north and south of the tropics, ami unrecortled from the interveniiij; 

 tropics, which do not come within the scope of this paper, see Challenger Report, Summary of Results, pp. 1446-1-449. 



