74 U.S. NATIONAL MUSEUM BULLETIN 2 27 



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

 Norway to English Channel, Hudson Bay to off North Carolina, Bering 

 Sea to Mexico, north Japan Sea, China. In low water to 938 fathoms. 



Eteone flava (Fabriciiis, 1780) 



Figure 16/ 



Eteone depressa Verrill, 1881, pp. 304, 308, 311. 



Eteone sarsi Webster and Benedict, 1887, p. 711. 



Eteone flava Fauvel, 1923, p. 173, fig. 62,e-/.— Wesenberg-Lund, 1953, p. 33.— 



Pettibone, 1954, p. 235, fig. 27^.— Uschakov, 1955, p. 101, fig. 8.— Clark, 



1960, p. 17. 



Description. — Length up to 120 mm., width up to 4 mm., seg- 

 ments numerous. Dorsal cirri wider than long, slightly asymmetrical, 

 much larger than parapodial lobe. Color, in life: grayish white, 

 pinkish, pale yellow or brick red; color, preserved: brownish with 

 bluish-violet iridescence. 



Biology. — Found intertidally among rocks and gravelly sand. 

 Dredged on bottoms of mud and various combinations of mud, 

 gravel, and rocks and shells. 



Material examined.^ — ^Gulf of St. Lawi-ence (Saguenay Kiver, 

 Laurentian Channel, 28 fathoms), New Brunswick (north of North 

 Point, St. Andrews), Maine (Gulf of Maine, U.S. Fish Commission 

 Location 66, 65 fathoms, 1874). 



Distribution.- — Widely distributed in the Arctic. Also Iceland, 

 Faroes, Norway to English Channel, Gulf of St. Lawrence to Maine, 

 Bering Sea, north Japan Sea. Low water to 471 fathoms. 



Genus Mystides Theel, 1879 



Type (monotypy): Mystides borealis Theel, 1879. Contains only 

 one New England species. 



Mystides borealis Theel, 1879 



Figure 17c 



Mystides viridis Webster and Benedict, 1887, p. 712, pi. 1, figs. 10-11, 13, pi. 2, 



fig. 12. 

 Mystides borealis Fauvel, 1923, p. 181, fig. 65,a-d.— Pettibone, 1954, p. 232, 



fig. 276. 



Description. — Length up to 16 mm., width up to 0.8 mm., seg- 

 ments up to 75. Body small, linear, tapering anteriorly and pos- 

 teriorly, flattened dorsoventrally. Prostomium suboval, with 2 

 deep-set eyes and 4 filiform frontal antennae. Tentacular cirri 

 3 pairs, a pair on first segment and 2 pairs on second segment; cirri 

 enlarged basally, tapering to long filiform tips. Dorsal, ventral, and 

 anal cirri oval, thick, flattened. Color, in life: yellowish brown, 

 greenish yellow or light green with darker cirri; color preserved: 



