28 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



300 m in order to exclude a large number of sublittoral species recorded 

 sparsely from depths of 200-300 m. That depth is believed to be more 

 significant for the upper limit of the bathyal fauna in the mid-latitude 

 submarine canyons than is the 200 m depth, for at 300 m the first truly 

 bathyal taxa, the harpinias, are found. 



The broader distribution of Amphipoda in the Pacific Ocean outside 

 of southern California is poorly known. Only a few of the littoral and 

 bathyal species that have been reported upon by Gurjanova (1938, 1951, 

 1952, 1953, 1955, 1962) from the northwestern Pacific, the Japan Sea, 

 Okhotsk Sea and Bering Sea have been discovered in southern Cali- 

 fornia, but a significant proportion of these occur in the north-eastern 

 Atlantic (Table 22). 



As shallow water species are of no concern to this discussion, it com- 

 mences with those species of Table 22 having median depths of 266 m 

 or more. Westwoodilla caecula forma acutifrons (266 m) and the typical 

 form represent the only members of this diverse boreal genus occurring 

 as far south as southern California. The closely related, if not synony- 

 mous, genus Bathyrnedon is diversified in southern California, but none 

 of the known boreal species has been found there. Another oedicerotid 

 genus, Aionocidodes, has the species M. latissimanus and 71/. norvegicus 

 present in southern California, but none of the other numerous boreal 

 species is known to occur that far south, even in bathyal depths. 



Of the three species of boreal Bruzelia, only one, B. tuberculata, 

 extends to southern California, although one new species is described and 

 other new species are believed to occur in Cedros Trench material being 

 studied at this time. 



Paraphoxus oculatus, the only species of that enormously diverse 

 genus living in the northeastern Atlantic, occurs also in the Pacific 

 Ocean. It submerges toward the tropics. In southern California waters 

 its minimum recorded depth is 239 m. Except for Paraphoxus calcaratus 

 and the reports herein of P. daboius, P. abronius, P. obtusidens and 

 P. spinosus, all appearing to be abnormally displaced bathymetrically, 

 Paraphoxus oculatus is the deepest dwelling member of the 44 species in 

 the genus. Its wide range and eurybathicity may be connected with its 

 presumed penetration from the Pacific to the northeastern Atlantic Ocean 

 (see remarks by J. L, Barnard, 1958a) ; otherwise, Paraphoxus is con- 

 fined to the western Atlantic and Indo-Pacific Oceans. 



Paraphoxus calcaratus is a shallow-water member of the northwest- 

 ern Pacific fauna that submerges tropicwards in southern California, as, 



