228 BULLETIN OF THE BUREAU OF FISHERIES 



Doctor McMurrich (in his plankton lists, see p. 12) lists a few at St. Andrews on 

 January 23 and again on January 26, 1916. Probably it becomes pelagic only by 

 accident in tide-swept situations. 



Eucalanus attenuatus Dana 



This species is widely distributed in the warmer parts of the Atlantic, Pacific, 

 and Indian Oceans, and in the Mediterranean. In the northeastern Atlantic it has 

 been taken as far north as the Faroe Channel. Wheeler (1901) records one specimen 

 from the Gulf Stream off Woods Hole; our outermost station (10218) off the con- 

 tinental edge south of Georges Bank yielded a few in hauls from 60-0 and 300-0 

 meters on July 21, 1914; and Willey (1919) records it in equally small numbers 

 from about the same position, relative to the continental slope, off Cape Sable on 

 July 22, 1915. 



In the Gulf of Maine it occurs very rarely, only as a stray from the oceanic 

 waters of the Atlantic Basin. Its name does not appear at all in the summer lists 

 for the years 1912 to 1914, or during the months of February and March, 1920, or 

 May, 1915; but there is record of it in small numbers (1 to 2 per cent of the copepods) 

 in Massachusetts Bay on April 6 (station 20089) and on May 4 (station 20121), 

 and on German Bank on April 15 (station 20103), all in 1920. In 1915 odd speci- 

 mens appeared in the vertical hauls in the Fundy Deep on June 10 (station 10282) , 

 in and off Massachusetts on September 29 and October 1 (stations 10321 and 10323), 

 and finally off Penobscot Bay on January 1, 1921 (station 10496). When these 

 locality records are plotted in connection with those of its genus mate, E. elongatus 

 (fig. 71), they point to immigration into the eastern side of the gulf and around its 

 northern shore to the Massachusetts Bay region, which is the route followed by most 

 of the planktonic immigrants. It is evident from the dates just given that E. atten- 

 uates may stray into the gulf at any time of the year, but it is not likely that it is 

 ever able to establish more than a temporary footing there. 



Eucalanus elongatus Dana 



This species, described by Farran (1911, p. 93) as "characteristic of the warm 

 seas of the open ocean," has been recorded from sundry widely separated localities 

 in the tropical parts of the Pacific and Indian Oceans, in the Mediterranean, and 

 in the south and north Atlantic. According to Farran (1911) it occurs the year 

 round in the Atlantic as far north as the coasts of Ireland, while Wolfenden (1904) 

 describes it as abundant in the Faroe Channel and not uncommon in the fjords of 

 Shetland, and the plankton lists of the International Committee for the Exploration 

 of the Sea show that it is frequently carried round the north of Scotland into the 

 North Sea and even to the Skager-Kak. Not being known from the Norwegian 

 sea farther north, its northern limit, as Wolfenden remarks, is well defined. Wheeler 

 (1901) did not find it in the Gulf Stream gatherings taken off Marthas Vineyard, 

 but more recently we have taken it at three stations over and seaward from the 

 southwestern part of Georges Bank (July 21, 1914, station 10218, and February 23, 

 1920, stations 20044 and 20045) ; also off the southeast face of the same bank on 

 March 12 (Station 20069) and in the eastern channel on April 16 (station 20107), 



