196 U.S. NATIONAL MUSEUM BULLETIN 2 27 



Branchiae (fig. 50d) cirriform, sickle shaped, beginning on setigers 

 3-4 and continuing to near posterior end. Dorsal or branchial cir- 

 rus subulate, widest basally, tapering distally (without enlarged lobe 

 at base as in A^. bucera). Ventral cirri conical. Color: without color; 

 faintly to darkly pigmented, variously marked, may be somewhat 

 banded on anterior region, the bands may be more or less continu- 

 ous as a dark brown median dorsal longitudinal line; prostomium 

 without color or with scattered pigment spots (fig. 49c). 



Biology. — Found at low water in muddy sand, sandy rubble, 

 gravelly sand. Dredged on bottoms of sand, muddy sand, with 

 shells, sea weeds. 



Material examined. — Type specimens from Nahant, Massa- 

 chusetts (deposited in MCZ, Harvard, poor condition, dried up). 

 Also numerous specimens from Massachusetts (Woods Hole region. 

 Stony Beach, Nobska, North Falmouth, Chappaquoit; Nantucket 

 Sound, off Martha's Vineyard; Elizabeth Islands, Hadley Harbor, 

 Nonamesset Island, Cutty hunk; Cape Cod, Wellfleet; North and 

 South ponds, Megansett Estuary), Rhode Island (Greenwich Bay, off 

 Newport), New Jersey (Great Egg Harbor), Maryland (off Chesa- 

 peake Bay), North Carolina (Beaufort), low water to 21 fathoms. 



Distribution. — Massachusetts (Cape Cod) to South Carolina. 

 Low water to 21 fathoms. 



Nephtys bucera Ehlers, 1868 



Figures 49d; 50,a,b; 51d 



Nephthys bucera Ehlers, 1868, p. 617, pi. 23, fig. 8.— VerrlU and Smith, 1874, pp. 



122, 289, pi. 12, fig. 58.— VerrlU, 1881, pp. 296, 300.— Webster and Benedict, 



1884, p. 702.— Andrews, 1891a, p. 280.— Sumner, Osburn, and Cole, 1913, 



p. 619 (part).— Coonfield, 1931, p. 416; 1934, p. 399. 

 Nephthys picia Mcintosh, 1900, p. 266, pi. 7, figs. 3-5, 8, pi. 8, figs. 9-11.— 



Whiteaves, 1901, p. 83.— Treadwell, 1948, p. 23, fig. 10,i),c.— Not Ehlers, 



1868. 

 Nephtys bucera Hartman, 1944a, p. 339, not pi. 15, figs. 3,4 (^A''. picta); 1950, 



p. 105; 1951, p. 49. 



Description. — Length up to 300 mm., width up to 20 mm., seg- 

 ments up to 140. Prostomium (figs. 49f/; 50a) with anterior margin 

 thin, flat, spatulate, tapering laterally into the anterior pair of an- 

 tennae, with translucent areas at theu- inner bases. Posterior pair of 

 antennae emerge from depressions ventrolaterally, hidden from view 

 dorsally by the enlarged tentacular segment. Tentacular segment 

 with conical notopodial and neuropodial setigerous lobes with setae 

 directed anteriorly, lateral to prostomium; with enlarged flattened 

 membranous lateral neuropodial lobes each with ventral tentacular 

 cirrus extending laterally about midway along lobe; without dorsal 



