8 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



explored by the Albatross, namely, the vicinity of the Aleutian 

 Islands and northward. As this group is particularly characteris- 

 tic of Bering Sea, it may well be called the Bering fauna. It is 

 made up of some twenty-four species, of which Ophiura maculata 

 may be cited as a typical example; this species is represented in the 

 collection from eighteen different stations, of which the farthest north 

 is about lat. 71° N., the farthest south at 52°, the farthest east is 

 about long. 166° W., and the farthest west near long. 159° E. It 

 will be noted that these limits are practically those of Bering Sea 

 itself, except to the northward, where several of the twenty-four 

 species extend into the Arctic Ocean. Two of the twenty-four were 

 taken as far east as long. 136° W., but only in water exceeding 1,500 

 fathoms in depth; none of the others were found east of 148° and only 

 one east of Kadiak. To the south westward, however, we find three 

 species extending their range along the Kurile Islands into the 

 Okhotsk Sea. 



Connecting the Honshu and Bering faunas are a group of sixteen 

 species, which either range from Bering Sea southwestward into the 

 sea of Japan or southeastward below lat. 52° N., or else have been 

 taken as yet only in the vicinity of Sakhalin or the Hokkaido. As a 

 rule, however, it is easy to see with which fauna these species are 

 naturally allied, and the following list is an attempt to assign each to 

 its proper place: 



Ophiura brachyactis. Bering fauna; indicated by its occurrence only in extremely 

 cold water in the Okhotsk Sea. 



Ophiura fiagellata. Probably neither Bering nor Honshu, but more properly regarded 

 as Oceanic. (See below.) 



Ophiura irrorata. Like 0. flagellata. 



Ophiura penichra. Honshu fauna; indicated by relationship to sterea and the locality 

 where taken, south of the Hokkaido. 



Ophiura quadrispina. Bering fauna, but extending southwestward into the northern 

 part of the Sea of Japan. 



Ophiopenia disacantha. Bering fauna, rarely extending into tke Sea of Japan. 



Ophiopholis mirabilis. Honshu fauna; indicated by its temperature range. 



Amphiodia craterodmeta. Bering fauna, rarely extending into the Sea of Japan. 



Ophiacantha adiaphora. Bering fauna; indicated by temperature range; rarely extend- 

 ing southward to Sea of Japan and Sagami Bay. 



Ophiacantha bathybia. Bering fauna; indicated by temperature range; extending 

 southward to 51°. 



Ophiacantha bidentata. Bering fauna; indicated by temperature range; extending 

 southward into the Sea of Japan. 



Ophiacantha cataleimmoida. Bering fauna, extending southward on the east coast of 

 Japan. 



Ophiacantha rhachophora. Completely connects the two faunas and can not be assigned 

 certainly to either one. 



Ophiolebcs asaphes. Bering fauna; indicated by temperature range and by distribu- 

 tion of its related species. 



Ophiolebcs brachygnatha. Bering fauna. 



Ophiolebes tijlota. Bering fauna, rarely extending into the Sea of Japan. 



