236 U.S. NATIONAL MUSEUM BULLETIN 2 27 



pectinate or comb setae (fig. Q2,g-h; few in number, easily missed) ; 

 lower bundle with (3) compound setae (figs. 62/, Q3d) and (4) single 

 lower acicular seta beginning on about setigers 35-45 (fig. Q2i). 

 Acicula dark to black. Proboscis mth a pair of elongated dark 

 mandibles, flaring anteriorly (fig. Q2j). Maxillae, i forcepslike, with 

 a pair of sliort elongate-ovate maxillary carriers; maxillae v repre- 

 sented by a pair of small squarish chitinous plates (fig. Q2k) . 



Key to the New England Species of Marphysa 



1, Prostomium and fused palps distinctly notched anteriorly (fig. 62a). 

 Branchiae begin on about setiger 20 (10-40), extending over a long region 

 of body, with 1 to 8 filaments per branchia (fig. Q2,b,d) . . . M. sanguinea 

 Prostomium and fused palps rounded anteriorly, not notched (fig. 63a). 

 Branchiae begin on setigers 12-15, relatively few in number (12-21 pairs), 

 with 7-19 filaments per branchia (fig. 636) M. bellii 



Marphysa sanguinea (Montagu, 1815) 



Figure 62 



Marphysa leidyi Verrill and Smith, 1874, pp. 25, 38, 53, 70, 116, 128, 140, 299, 

 pi. 12, fig. 64.— Verrill, 1881, pp. 291, 301, pi. 4, fig. 3.— Sumner, Osburn, and 

 Cole, 1913, p. 621. 



Marphysa sanguinea Webster, 1879, p. 236, pi. 6, figs. 76-80, pi. 7, figs. 81-83; 

 1886, p. 144.— Andrews, 1891a, p. 287.— Fauvel, 1923, p. 408, fig. 16l,a-h; 

 1933, p. 28; 1953, p. 245, fig. 123,a-/i.— Hartman, 1944a, p. 127, pi. 17, fig. 16 

 (as Eunice floridana) ; 1944d, p. 127, pi. 8, figs. 179-183; 1945, p. 23; 1951, p. 

 57, pi. 14, figs. 3-6; 1956, pp. 254, 262, 268, 284.— Andrew and Andrew, 1953, 

 p. 9.— Fauvel and Rullier, 1957, p. 87; 1959, p. 946.— Wesenberg-Lund, 1958, 

 p. 17.— Rioja, 1958, p. 264.— Reish, 1959, p. 83.— Clark, 1960, p. 22.— Day, 

 1960, p. 335. 



Marphysa acicularum Webster, 1884, p. 319, pi. 10, figs. 50-53. 



Marphysa orientalis Treadwell, 1936, p. 266, fig. 18,z-o. 



Description. — Length up to 600 mm., width up to 11 mm., seg- 

 ments up to 500. Anterior few segments of body narrower, cylin- 

 drical, then becoming wider, greatly flattened, tapering gradually 

 posteriorly; it breaks up very easily. Branchiae begin on about 

 setiger 20 (10-40) as a single or double filament above the bases of the 

 dorsal cirri, with a maximum of usually 4 filaments (2-8), with a 

 palmate-pectinate arrangement (fig. 62(/), continuing as a simple 

 filament to near the posterior end. Dorsal cirri short, digitiform, 

 scarcely longer than the parapodium. Ventral cirri digitiform on 

 anterior region, becoming shorter, thicker with rounded knoblike tips 

 laterally. 



Parapodia with lower bundle of compound setae all heterogomph 

 spinigerous, distally pointed, with long and short blades (fig. 62/). 

 Single lower heavy acicular seta beginning on about setiger 45, light 

 amber colored or transparent, bifid and hooded distally (fig. 62i) ; 



