198 U.S. NATIONAL MUSEUM BULLETIN 2 27 



larged lobe on upper basal part (fig. 506). Ventral cirri conical to 

 large, flattened, triangular. Color: without color; dusky with darker 

 pigmented bands; white with dark V-shaped pigmented bands (fig. 

 49d) ; prostomium colorless or with dark spot in center. 



Biology. — Found at low water in sand bars, in shifting sand, in 

 muddy sand. Dredged on bottoms of sand and stones. 



Material examined. — Type specimen from Isle of Shoals, New 

 Hampshire? (in MCZ, Harvard). Also numerous specimens from 

 Gulf of St. Lawrence (St. Lawi'ence estuary), Nova Scotia (Cam- 

 bridge and LawTencetown) , Maine (Griffith Head, Georgetown Island, 

 Sheepscot Bay; Old Orchard Beach; York; Sea Point near Kittery), 

 New Hampshire (Rye Harbor, Hampton Harbor), Massachusetts 

 (Georges Bank, 18-98 fathoms; Cape Ann, Annisquam River, Glouces- 

 ter; Cape Cod, Provincetown, Truro; Lagoon Pond on Martha's 

 Vineyard; Nantucket Sound, Woods Hole region, Nobska and Stony 

 Beach), Rhode Island (off Newport), New Jei-sey (Great Egg Harbor), 

 Virginia (Willoughbys Sand Spit), North Carolina (Beaufort), 

 Mississippi (Gulf Coast), Florida (Seahorse Key). 



Distribution. — Gulf of St. La^\Tence to North Carolina, Gulf of 

 Mexico (Mississippi). Low water to 98 fathoms. 



Nephtys incisa Malmgren, 1865 



Figures 49,a,&; 51a 



Nephthys ingens Verrill and Smith, 1874, pp. 137, 140, 213, 227, 289, pi. 12, figs. 



59-60.— Treadwell, in Cowles, 1930, p. 341.— Not Stimpson, 1854. 

 Nephthys incisa Verrill, 1881, pp. 297, ,300, 304, 307, 311, 313, 315, 317, 321.— 



Webster and Benedict, 1884, p. 702; 1887, p. 709.— Webster, 1886, p. 131.— 



Whiteaves, 1901, p. 83.— Moore, 1909a, p. 137.— Sumner, Osburn, and Cole, 



1913, p. 619.— Fauvel, 1923, p. 369, fig. 144,a, 6.— St0p-Bowitz, 1948a, p. 



63.— Wesenberg-Lund, 1950a, p. 21; 1950b, p. 60; 1951, p. 45.— Clark, 



1960, p. 21. 

 Nephthys lawrencii Mcintosh, 1900, p. 265, pi. 7, fig. 2, pi. 8, figs. 7, 8. — Whiteaves, 



1901, p. 83. 

 Nephthys phyllocirra Treadwell, in Cowles, 1930, p. 341. — Not Ehlers, 1887. 

 Nephtys incisa Hartman, 1944a, p. 339, pi. 15, fig. 5 (as A'', bucera) ; 1950, p. 108. — 



Clark, 1955, p. 547; 1957, p. 264.— Stickney. 1959, p. 15.— Eliason, 1962, p. 249. 



Description. — Length up to 150 mm., width up to 15 mm., 

 segments up to 75. Tentacular segment (fig. 49a) with setae well 

 developed, extending anteriorly, with both dorsal and ventral ten- 

 tacular cirri subequal to the antennae. Parapodia (fig. 51a) with 

 rami well separated, with acutely conical acicular lobes. All the 

 lamellae similar, rounded, small, shorter than or not much longer 

 than the acicular lobes. Thus the acicular lobes are rather well hidden 

 by the lamellae (the anterior lamellae may be somewhat undulate or 

 slightly bilobed). Setae relatively short, appearing yeUow to bronzy 



