NO. 3 



BARNARD : THE PHOXOCEPHALIDAE 



289 



coastal shelves, where warmer temperatures or competition may exclude 

 it. Like other cosmopolitan amphipods discussed by Barnard (1959) 

 and Barnard and Reish (1959), it thrives in areas of little competi- 

 tion, such as the North and eastern Atlantic. 



The three species of the western Atlantic, all of which are found 

 also in the eastern Pacific, are relatively warm water animals and 

 their pathway of migration is suggested as west to east through middle 

 America. 



With the exception of P. oculatus, no species is common to the 

 northern and southern hemispheres, although a number of north- 

 eastern Pacific animals should be expected as far south as Peru. 



The most important point to be gathered from Chart 1 is the large 

 area of oceans which remains unstudied ; the provisional conclusions 

 regarding faunal relationships will be modified considerably when the 

 unknown faunas have been examined. 



CHART 1 



World map showing distribution of Paraphoxus by area. 



Numbers in each area designate the number of known species. Arrows 

 indicate the number of species shared between the areas. Direction of the arrows 

 indicate migration of the species from its center of origin. Bidirectional arrows 

 indicate no opinion or knowledge concerning the origin. 



