170 U.S. NATIONAL MUSEUM BULLETIN 227 



Mississippi, Louisiana (St. Bernard Parish, Dutchman Gap; St. 

 Bernardo Pass; Half-Moon Island; Drum Bay), Uruguay. 



Distribution. — Gulf of St. Lawrence to Florida, Gulf of Mexico 

 (Florida to Mexico), West Indies (Puerto Kico, in mangroves). 

 Central America (both sides Panama), South America (El Salvador, 

 Venezuela, Uruguay), central California (San Francisco Bay and 

 its estuaries; brackish water of Lake Merritt), Denmark, North Sea, 

 English Channel, western Baltic to south coast of Spain, Mediter- 

 ranean, Adriatic, West and South Africa. In high intertidal to 25 

 fathoms; sexual epitokes at surface. 



Nereis (Neanthes) virens Sars, 1835 



Figure 44/ 



Nereis virens Turnbull, 1876, p. 265, pis. 42-44.— Webster, 1879, p. 235.— Verrill, 

 1881, pp. 290, 296, 297, 300, 304, 308.— Webster and Benedict, 1884, p. 717; 

 1887, p. 724.— Biimpus, 1898a, p. 485.— Hamaker, 1898, p. 89, pis. 1-5.— 

 Gray, 1900, p. 308.— Whiteaves, 1901, p. 81.— Sumner, Osburn, and Cole, 

 1913, p. 620.— Fauvel, 1923, p. 348, fig. 134,5r-A;.— Copeland and Wieman, 

 1924, p. 231.— Prefontaine, 1932, p. 207.— Procter, 1933, p. 139.— Miner, 

 1950, p. 317, pi. 103, pi. VII, 2, viii, 3.— Pratt, 1951, p. 330.— Wesenberg- 

 Lund, 1951, p. 42; 1958, p. 27.— Gustafson, 1953, p. 3.— Nicoll, 1954, p. 69, 

 figs. 1-3.— Berkeley and Berkeley, 1954, p. 458.— Newell, 1954, p. 334.— 

 MacPhail, 1954, p. 11, figs. 1-2.— Dow and Wallace, 1955, p. 1.— Pettibone, 

 1956a. p. 556. — J0rgensen and Dales, 1957, p. 357. — Sticknej^, 1959, pp. 14, 

 15.— Clark, 1960, p. 19. 



Nereis (Neanthes) paucidentata Treadwell, 1939b, p. 6, fig. 25 (type from Charles- 

 town, Massachasetts, examined, courtesy American Museum Natural 

 History).— Not Moore, 1903a. 



Nereis (Neanthes) varia Treadwell, 1941, p. 3 (new name for TV. paucidcntata , 

 preoccupied). 



Nereis southerni Abdel-Moez and Humphries, 1955, p. 147, figs. 1-6. — Rasmussen, 

 1956, p. 59. 



Nereis riisei Hartman, 1956, p. 279 (part; includes N. varia Treadwell from 

 Charlestown, Mass.). — Not Grube, 1856. 



Description. — Length up to 900 mm., width up to 43 mm., seg- 

 ments up to 200 or more. Body thick anteriorly, somewhat flattened 

 posteriorly, integument wrinkled. Tentacular cirri slender, tapering, 

 the longest extending to setigers 3-9. Parapodia vary only slightly 

 from anterior to posterior end (fig. 44/). Notopodium with 3 ligules, 

 upper one largest, widest basally, tapering gradually to bluntly 

 conical tip (largest in middle of body, decreasing slightly anteriorly 

 and posteriorly); lower one shorter, conical; middle or presetal one 

 still shorter, rounded (shorter and curved ventrally in middle and 

 posterior segments). Setigerous lobe of neuropodium with a short 

 rounded presetal lip and a longer fingerlike postsetal lip or ligule, 

 with a lower conical ligule. Dorsal and ventral cirri shorter than the 

 ligules. Acicula black. 



