POLYCHAETE WORMS, PART 1 179 



Boach, mouth of Oj^ster River, mud b}" Bellamy River; Hilton Park, 

 Dover Point, Yfentworth, north shore Little Harbor; Fort Stark, 

 Newcastle; Plampton Plarbor near entrance to Blackwater River), 

 INIassaclmsetts (Beverly Harbor, M. Gray; Annisquam River, Cape 

 Ann, R.W. Dexter). 



Distribution.- — Greenland, Iceland, Norway to English Channel, 

 North Sea, Baltic, Mediterranean, Adriatic, Gulf of St. Lawrence to 

 Massachusetts (Cape Ann), Puerto Rico(?). High intertidal to 22 

 fathoms. 



Nereis {Nereis) pelagica Linne, 1758 



Figure 42,d-/i 



Nereis pelagica Verrill, 1881, pp. 28S, 290, 293, 294, 295, 296, 297, 301, 308, 311, 

 315, 316, 324.— Webster and Benedict, 1884, p. 718; 1887, p. 724.— Whit- 

 eaves, 1901, p. 80.— Sumner, Osburn, and Cole, 1913, p. 619.— Fauvel, 1923 

 p. 336.— Herpin, 1926, pp. 15, 18, 29, 43, 59.— Wilson, 1932, p. 203, figs 

 1-12.— Procter, 1933, p. 139.— Thorson, 1946, p. 64, fig. 29.— Miner, 1950 

 p. 318, pi. 103.— Pratt, 1951, p. 330.— Grainger, 1954, p. 514.— Pettibone 

 1954, p. 264, fig. 30,0-6; 1956a, p. 557; 1956b, p. 290.— Uschakov, 1955, p 

 211, fig. 66. — Rasmiissen, 1956, p. 53, figs. 17-18. — J0rgensen and Dales 

 1957, p. 358.— Wesenberg-Lund, 1958, p. 26; 1962, p. 76.— Rioja, 1958, p 

 253.— Clark, 1959, p. 85; 1960, p. 19.— Fauvel and Rullier, 1959, p. 572. 



Description. — Length up to 155 mm., width up to 14 mm., seg- 

 ments up to 100. Body slender, trim, with integument smooth, not 

 wrinkled. Tentacular cirri rather short, subequal, longest may reach 

 setiger 2, with a tendency to be somewhat articulated distally. Para- 

 podial lobes (fig. 42(1) similar throughout the bod3^ Notopodium 

 with 2 subequal, short, thick, bluntly rounded ligules (subconical in 

 posterior region and in young specimens), between which is an incon- 

 spicuous setigerous lobe. Neuropodium with bluntly conical setiger- 

 ous lobe and a lower ligule which is similar to the notopodial ligules. 

 Dorsal and ventral cirri longer than the ligules. 



In the anterior region, notosetae homogomph spinigers (fig, 42g). 

 Upper group of neurosetae homogomph spinigers and heterogomph 

 falcigers; lower group of neurosetae heterogomph spinigers (fig. 42/) 

 and falcigers with short blades (fig. 4:2g). In the middle and pos- 

 terior regions, notosetae consist of few (4 or so) homogomph falcigers 

 with reduced blunt blades (fig. 42h; begin on about setiger 40). Neuro- 

 setae similar to the anterior region except some of the falcigers may 

 lose their blades and give the appearance of simple setae, 



Acicula black. Proboscis with black jaws, each with 5-7 teeth; 

 with paragnaths: area i with 1-3 denticles; areas ii and iv, arched 

 groups of 2-3 rows; area iii, small transverse groups of 2-3 rows; 

 area v, (rarely 1-3) ; area vi, usually 4 larger ones in square or 

 cross (2-8) ; areas vii-viii, 1-2 u'regular rows of Ciuite large parag- 



