154 U.S. NATIONAL MUSEUM BULLETIN 227 



apodous and achaetous, with 4 pairs slender, tapered tentacular cirri. 

 Parapodia (fig. 426) biramous. Notopodia with a conical setigerous 

 lobe with a thick bundle of homogomph spinigers (not spinous). 

 Neuropodia with a conical setigerous lobe and a lower ligule. Upper 

 neurosetae similar to no tosetae; lower neurosetae slightly heterogomph 

 spinigers with spines along the cutting edge; setae pale yellow, in 

 thick bundles; acicula dark. 



Dorsal cirri slender, tapering; dorsal cuTophores gradually elongated 

 on setigers 9 to 26 or so (may be filled with sex products), when the 

 whiplike dorsal cirri may overlap medially. Ventral cirri single on 

 first 2 uniramous setigers, double on rest. Proboscis (fig. 42a) large, 

 muscular, with 2 jaws light brown, curved, with inner edge serrulate 

 (about 11 teeth); without paragnaths; with soft conical papillae on 

 oral ring only, consisting dorsally of 3 papillae and ventrally of 7 

 papillae in a row followed by 3 smaller ones in a second row. Color, 

 in life (Verrill, 1879): pale brownish or pinkish, dorsal cirrophores 

 and bases of parapodia bright red, setigerous lobes greenish, setae 

 dark at base. 



Biology. — Dredged on bottoms of soft mud and mud with coarse 

 sand and gravel. 



Material examined.— Off Nova Scotia (43°48' N., 63°46' W.) to 

 off Vu-ginia (37°12' N., 47°20' W.), in 25 to 1,168 fathoms. Albatross 

 stations. 



Distribution. — Sweden, Norway, Denmark, Iceland, North Sea, 



Gulf of St. Lawrence to off Virginia, Oldiotsk Sea. In 25 to 1,168 



fathoms. 



Genus Platynereis Kinberg, 1866 



Nedonereis Verrill, 1873a; type (monotypy) : Nedonereis megalops Verrill, 1873a; = 

 male epitoke Platynereis diimerilii megalops (Verrill, 1873a). 



Type (designated by Hartman, 1949): Platynereis magalhaensis 

 Kinberg, 1866; = P. australis (Schmarda, 1861). Contains only one 

 New England species. 



Platynereis dumerilii (Audouin and Milne-Edwards, 1833b) 



FlGUKE 43 



Nedonereis megalops Verrill and Smith, 1874, pp. 14G, 159, 298, pi. 12, figs. 62, 63. 



Nereis alacris Verrill, 1879, p. 171. 



Nereis megalops Verrill, 1879, p. 172; 1881, pp. 301, 320, pi. 5, figs. 1-2; 1882, 



p. 370.— Andrews, 1891a, p. 284.— Wilson, 1892, p. 371.— Bumpiis, 1898c, 



p. 855.— Miner, 1950, p. 320, pi. 104. 

 Nereis dumerilii Webster, 1879, p. 234. — Sumner, Osburn, and Cole, 1913, p. 



621.— Lillie and Just, 1913, p. 158.— Hoagland, 1919, p. 574.— Just, 1929, 



p. 307.— Treadwell, in Cowles, 1930, p. 342.— Miner, 1950, p. 320, pi. 104.— 



Wesenberg-Lund, 1951, p. 43. 

 Platynereis ynegalops Sumner, Osburn, and Cole, 1913, p. 621. — Just, 1914, p. 201. — 



Costello, et al., 1957, p. 89.— Hartman, 1959a, p. 278.— Clark, 1961, p. 216. 



