328 



BULLETIN OF THE BUREAU OF FISHERIES 



the continental slope have been in temperatures ranging from about 6 to 10.8° 

 (station 10061). 73 



The salinities have been even higher for S. lyra than for S. maxima, ranging 

 from 34.3 per mille to about 35 per mille within the gulf and about the same along 

 the slope outside. Thus, on the whole, our observations corroborate Huntsman's 

 (1919, p. 432) conclusion that S. lyra is associated with rather higher temperatures 

 than is S. maxima, though equally cosmopolitan in the mid-depths of the high seas. 



Sagitta hexaptera D'Orblgny 



The claim of S. hexaptera to mention here rests on a single specimen, since lost, 

 taken near Lurcher Shoal on August 12, 1914, in a tow from 100 meters (Bigelow, 

 1917, p. 297). Outside the gulf it is a regular inhabitant of the intermediate strata 

 of the oceanic basin, occurring at all the outermost Canadian stations (Huntsman, 



1919, p. 423) and at one of our own (station 20044). We likewise found it over 

 the slope abreast of Delaware and Chesapeake Bays in July, 1913 (Bigelow, 1915, 

 p. 297). Huntsman (1919, p. 424) has described its faunistic status, saying that it 

 belongs to the Gulf Stream coming up from the south off the northeastern American 

 coast, not to the cold boreal water coming down from the north. In the former 

 it is characteristic of the intermediate depths from 100 to 200 meters, and it occurs 

 so regularly 50 to 60 miles out beyond the continental edge that careful watch 

 should be kept for it within the Gulf of Maine as an indicator of tropical water. 



Eukrolmia hamata Mobius 



The general status of this glass worm has been discussed in an earlier chapter 

 (p. 63) as an immigrant in the Gulf of Maine. Only a few notes need be added 

 here on the actual record of its local occurrences. Eukrohnia being, beyond ques- 

 tion, a creature of the deeper strata of water in these latitudes, the precise depths 

 of the captures are of interest. So far as I can learn it has only once been found 

 on the surface within the limits of the gulf — viz, a single specimen recorded by 

 Huntsman (1919, p. 476) from Friar Eoads in the Bay of Fundy. No doubt, as 

 he suggests, vertical currents were responsible for bringing this lone Eukrohnia up 

 to the surface there from its normal habitat deeper down, the local tides being 

 "of such magnitude that the water forms whirlpools and the boiling up of the deep 

 water to the surface can be seen constantly." At this locality three Eukrohnia were 

 also taken at 20 meters on the same occasion. For the open gulf our shoalest 

 records for it are from 40 meters (stations 10095 on German Bank, 10099 close to 

 Mount Desert Island, and 10102 off Penobscot Bay, one or two examples at each, 

 all in August, 1913, and several taken near the eastern Maine coast on March 22, 



1920, station 20080), 50 meters (one specimen, station 10497, near Mount Desert 

 Kock, January 1, 1921, and odd specimens from Browns Bank, June 24, 1915, station 

 10296), and 60 meters (off Cape Elizabeth, December 30, 1920, station 10494; 

 near Lurcher Shoal; and over the deep trough to the northeast on August 12 and 

 13, 1913, at stations 10096 and 10097). 



" At station 10295 the specimens may have come from water as cold as 4.9°, but equally from the warmer strata penetrated 

 by the net on its journey down and up. 



