POLYCHAETE WORMS, PART 1 273 



72c). After about setiger 50 there is a short rounded presetal lobe 

 and a longer digitiform postsetal lobe which gradually gets longer. 

 In the posterior region (about the posterior third), the presetal lobe 

 gets longer gradually and the parapodial lobe becomes distinctly 

 bilabiate (fig. 12d). Parapodia with a few simple limbate setae 

 (fig. 72e) and a single stout projecting acicular seta or spine (fig. 72/). 

 Setae and acicula pale. Anal cutI 4, short, subequal, bulbous. 



Proboscis usually with a pair of widely separated, short, wedge- 

 shaped mandibles (fig. 72(7), which are probably degenerate, as they 

 are variable in shape and size and may be strongly asymmetrical. 

 Webster found that 1 or both mandibles may be missing. Four 

 pairs of maxillae (fig. 72A) present. Color: iridescent, bright to 

 pmkish red. 



Biology. — Found at low Avater, burrowing in sand, mud, and 

 muddy sand with rubble. Dredged on bottoms of fine sand, silty 

 clay, mud, with worm tubes or fine gravel. Become coiled and 

 tangled in knots and secrete a good deal of mucus. This species, 

 which ramifies through the sand as living threads of great delicacy, is 

 remarkable for the tenuity to which it can be stretched (Moore, ms.). 



Material examined. — Nmnerous specimens from Massachusetts 

 (Georges Bank, 44-50 fathoms, R. Wigley; Barnstable, Wellfleet on 

 Cape Cod, Woods Hole region. Buzzards Bay, Nantucket Sound, 

 Vineyard Sound), Rhode Island (Greenwich Bay, A. P. Stickney), 

 New Jersey (Raritan Bay), Long Island Sound, North Carolina 

 (Beaufort), South Carohna (Coosans River, FishHaiok, 1891), Georgia, 

 (Sapelo Island). 



Distribution. — Massachusetts to Georgia, West Indies. Low 

 water to 1,340 fathoms. 



Drilonereis magna Webster and Benedict, 1887 



Figure 71h 



Drilonereis magna Webster and Benedict, 1887, p. 725, pi. 4, figs. 60-03. — Not 



Hartman, 1945, p. 27; 1951, p. 63. 

 Drilonereis falcata Moore, 1911, p. 298, pi. 20, figs. 150-154.— Hartman, 1944d, 



p. 179; 1960b, p. 106.— Day, 1960, p. 364. 

 Drilonereis cylindrica Hartman, 1951, p. 64, pi. 16, figs. 3-5. 



Description. — Length up to 200 imn., width up to 2.5 mm., 

 segments up to 300. Parapodia short and stout throughout, with a 

 short bluntly rounded presetal lobe and a longer digitiform postsetal 

 lobe, with simple lunbate setae and 1-2 stout projecting acicular 

 setae. Setae and acicula yellow to pale. Anal cu'ri 2 to 4, short. 

 Proboscis with a pau- of black subtriangular to oval mandibles, with 

 4-5 pairs of maxillary pieces. Maxillae v each with a single fang, 

 may or may not be present. 



