TEMPERATE NORTH PACIFIC. 269 



The Shore fishes of the North Pacific generally are com- 

 posed of the following elements : — 



a. Arctic forms which extend into the Arctic Ocean, and 

 the majority of which are also found in the British district. 



h. Peculiar forms limited to the North Pacific, like the 

 Ifeterolejndina, Emhiotocidce, and certain Cottoid and Blen- 

 nioid genera. 



c. Forms identical with fishes of the Mediterranean. 



d. Peculiar forms limited to the southern parts of Japan. 



e. Tropical forms which have entered the North Pacific 

 from the south. 



1. The small list of fishes which we can assign to the 

 Kamtschathan district is due rather to the imperfect manner 

 in wdiich its fauna has been explored than to its actual 

 poverty of fishes ; thus, although we may be sure that sooner 

 or later the small kinds of Dog-fishes of the British district 

 will be found there also, at present we have positive know- 

 ledge of the occurrence of only two Chondropterygians, viz. 

 Chimccra and Bnja. The species of the latter genus seem to 

 be much less numerous than in the Atlantic. 



Of Acanthopterygians the following are known : — Sebastcs ; 

 Chirus, Agrammus ; Fodahrus, Blejysias, Cothis, Centridermich- 

 thys,Hemilepidotus,Agonus; Trichodon; Calliomjmus ; LijJaris; 

 Didyosoma, Stichceus, Ccntronohis. 



Labroids are absent ; they are clearly a type unable to 

 endure great cold ; of the Embiotocoids which represent them 

 in the Pacific, one species only (a species of Ditrema) is known 

 from this district. 



The Gadoids are, so far as we know at present, sparsely 

 represented, viz. by isolated species of Gadus, Motella, and 

 Lotella, the latter being an inhabitant of moderate depths 

 rather than of the surface. Bippoglossus, Pleuronectes, and 

 Parophrys, seem to occur everywhere at suitable localities. 



