POLYCHAETE WORMS, PART 1 249 



first setiger as a single filament, continuing up to setigers 10-22 or so, 

 then with 2 branches, then 3, with a maximum of 5-7 pectinate 

 fiJameuts, becoming simple in more posterior segments and continuing 

 to near end of body. Ventral cirri subulate on first 5-6 setigers. 

 Special hooked setae of anterior 2 setigers tridentate (bidentate, 

 according to Fauvel). Anal cirri 4, 2 lower ones shorter. Color: 

 metallic violet, darker at bases of parapodia; may have darker rings 

 on buccal; and first setigerous segments. Tube: thin membranous 

 lining encrusted with fine sand or mud. 



Biology. — Dredged on bottoms of sand, sand mixed with mud, 

 gravel and shells. 



Material examined. — Nantucket Somid, Massachusetts, 8 fath- 

 oms; off Long Island Sound (35°20' N., 75°19' W.), ^Z6a^ross Sta- 

 tions, 15-77 fathoms. 



Distribution. — Off Long Island Sound, Caribbean Sea to Vene- 

 zuela and Colombia, Mediterranean, Adriatic, south Ai-abian coast, 

 Indian Ocean, West and South Africa, China, central California to 

 Mexico, Guatemala, In 8 to 835 fathoms. 



Onuphis {Onupliis) quadricuspis Sars, 1872 

 Figure 656 



Onuphis quadricuspis Sars, 1873, p. 216, pi. 15, figs. 7-19. — Mcintosh, 1003, 

 p. 149, pi. 12, figs. 35-37.— Fauvel, 1923, p. 418, fig. 165,/-p.— Wesenberg- 

 Liind, 1950a, p. 26; 1951, p. 55.— Fauvel and Rullicr, 1959, p. 938.— Eliason, 

 1962, p. 253. 



Nothria conchyphila Verrill, 1885a, p. 524, pi. 41, fig. 181 (part); 1885b, p. 432 

 (part) . 



Nothria conchylega Hartman, 1944a, p. 340, pi. 23, fig. 4.— Not Sars, 1835. 



Description. — Length up to 60 mm., width up to 2.5 mm., seg- 

 ments more than 100. Prostomium with or without a pair of minute 

 anterior eyes. Ceratophores of occipital antennae short, ringed (about 

 6 rings). Dorsolateral pair of occipital antennae longer than median 

 unpaired one. Branchiae begin on setigers 5-9, with a maximum of 

 4-5 pectinate filaments (fig. 656) ; branchiae absent from a long 

 posterior region. Ventral cirri subulate on first 3 setigers (5 according 

 to Fauvel). Special hooked setae of anterior 5 setigers bidentate 

 (tridentate, according to Fauvel). Anal cirri 4, 2 Jowcr ones shorter. 

 Color, in life: banded reddish brown, 1 wide band per segment; color, 

 in alcohol: pale gray or reddish brown, may be banded. Tube: a 

 cylindrical membranous lining encrusted with mud. 



Biology.— Dredged on bottoms of mud, sandy mud, and mud with 

 gravel, pebbles. 



Material examined.- — Gulf of St. Lawrence (Bay of Chaleurs, 

 south of Anticosti Island, 22-140 fathoms), off Nova Scotia {Albatross 

 Station 2504, 44°23' N., 61°22' W., 82 fathoms; Z^e/awre Station, 



