^Z PROCEEDINGS OF THE NATIONAL MUSEUM vol. eo 



In attempting to summarize the results obtained by the Bache, 

 from the point of view of the Crustacea now dealt with, one or two 

 points emerge which may be noted here. 



1. Stations 10157-10160 are situated in a faunistic area which is 

 quite sharply marked off from the rest of the area explored. 



Station 10157 is a purely littoral station characterized by the 

 presence of the littoral Mysids, Mysidojpsis and Neomysis. Station 

 10160 is in the coastal waters and station 10158 on the slope where 

 the tropical oceanic water and the coastal water mix. These two 

 stations are characterized by the presence of three Euphausians, 

 Euphausia Tcrohnii, Meganyciiphanes norvegica, and Nematoscelis 

 megalops, the fii'st and last in great abundance. These three species 

 occurred at no other station in the whole area explored and are, 

 moreover, northern or boreal species. At station 10160 only these 

 three species occurred, but at station 10158, which is nearer to the 

 slope, the following additional species were found: 



Specimen 



Thysanopoda monacantha 1 



Euphausia lenera 4 



Euphausia hemigibba 2 



Thysanoessa gregaria 66 



Nemaloscelis microps 1 



Nematobrachion boopis 1 



These species are members of the tropical oceanic fauna, and the 

 haul at station 10158 bears out in a striking way the oceanographical 

 results of the cruise, in which station 10158 was found to be in the 

 region of the slope where the coastal and oceanic waters mix. The 

 Euphausian fauna at this station shows abundant evidence of this 

 mixing of the waters, retaining, however, a predominant northern or 

 coastal facies. 



The stations 10158 and 10160 are probably on the seaward fringe 

 of the area of distribution of Meganyciiphanes norvegica, which would 

 account for its occurrence in such small numbers. The difference in 

 the relative abundance of E. krohnii and N. megalops at the two 

 stations is probably correlated with the difference in the depth at 

 which the hauls were taken. At station 10160 a haul at 100 meters 

 yielded only 4 N. megalops to about 2,000 E. Icrohnii, while at station 

 10158, where the haul was made at 600 meters, the numbers were 500 

 and 2,000, respectively. 



2. The rest of the area, which may be called the tropical oceanic 

 area, represented by the hauls from stations 10161-10212, appears, 

 at least as far as the Euphausians are concerned, to be a homogeneous 

 uniform faunistic area. It has not been possible to say, from an 

 examination of the hauls, that one or another species is more abund- 

 ant in and characteristic of any special part of the area. All the 

 species appear, with greater or lesser degrees of abundance, to be 

 generally and widely distributed in this area. 



