POLYCHAETE WORMS, PART 1 65 



66°04' W., 1,769 fathoms, 1885). Off Chesapeake Bay (Albatross 

 Station 2097, 37°56' N., 70°57' W., 1,917 fathoms, 1883). 



Distribution. — Greenland, Davis Strait, Norway, Iceland, Den- 

 mark Strait, Nova Scotia to off Chesapeake Bay, Antarctic. In 

 66 to 1,917 fathoms. 



Euphrosine borcalis Oersted 1843 



Figure 14,a-e 



Euphrosyne borealis Verrill, 1881, pp. 290, 303, 307, 314.— Webster and Benedict, 

 1887, p. 708.— Whiteaves, 1901, p. 88.— Treadwell, 1939a, p. 170, fig. 46,a- 

 6.— Annenkova, 1937, p. 155; 1938, p. 139.— Wesenberg-Lund, 1953, p. 29.— 

 Uschakov, 1955, p. 224, fig. 71. 



Euphrosyne loiigiseiis Treadwell, 1939a, p. 169, fig. 46,f7-z, 



Description. — Length up to 25 mm., width inchiding setae up to 

 15 mm., segments 24-31. Dorsum nearly covered with notosetae, 

 with only a narrow bare middorsal region without setae, the upper 

 tips of the notosetae often overlapping middorsally. Each noto- 

 podium with usually 7 (6-8) branchiae, with 3 of them (rarely 2) 

 between the inner and outer dorsal cirri. Branchiae dicotymously 

 branched, usually 2-4 branches (1-12), the terminal filaments not 

 knobbed or thickened. Notosetae of 2 Idnds: (1) Longer spikelike 

 smooth setae with short lateral spur, tapering to pointed or blunt 

 tips (tips may be broken off), projecting far above the branchiae and 

 giving a very hirsute aspect; (2) shorter unequally bifurcated serrated 

 setae, the longer branch curved toward the shorter branch, with 

 strongly marked serrations on inner sides. Neurosetae with tips 

 somewhat hooked, with short lateral spur, about as long as longest 

 notosetae. Colorless when preserved. 



Biology. — Dredged on bottoms of mud, rocks, stones, sand and 

 gravel, and gravel and stones. 



Material examined. — Off Ne\vfoundland, Gulf of St. Lawrence 

 (Bay of Chaleurs), Nova Scotia, Gulf of Maine, Georges Bank, Mas- 

 sachusetts Bay, in 20 to 127 fathoms. 



DisTRiBUTiOxN. — Widely distributed in the Arctic. Also Iceland, 

 Norway to Great Britain, Newfoundland, Gulf of St. Laurence to 

 Massachusetts (Massachusetts Bay), north Japan Sea. In 5 to 753 

 fathoms. 



Euphrosine armadillo Sars, 1851 



Figure 14/ 



Euphrosyne armadillo Fauvel, 1923, p. 137, fig. 49,o-5.— Wesenberg-Lund, 1950a, 



p. 12, pi. 2, figs. 10, 11; 1951, p. 24. 

 Euphrosyne branchiaia Treadwell, 1939a, p. 170, fig. 4G,c-/. 



Description. — Length up to 10 mm., width including setae up to 

 4 mm., segments 19-21 (up to 30, Fauvel). About a thu-d of mid- 



