290 U-S. NATIONAL MUSEUM BULLETIN 22 7 



Island, Pictou County), Maine (Glen Cove, mouth of Penobscot Bay; 

 Boothbay Harbor region; Waites Landing, Falmouth Foreside, Casco 

 Bay), New Hampshire (Hilton Park, Dover Point; Rye Harbor; 

 Hampton Beach; Hampton Harbor near entrance to Blackwater 

 River), Massachusetts (Georges Bank, 24-30 fathoms, R. Wigley; 

 Marblehead; Duxbury; Woods Hole region; Ehzabeth Islands; 

 Martha's Vineyard; Nantucket Sound; Cape Cod), Rhode Island 

 (Greenwich Bay; Potters Pond), North Carohna (Beaufort), Florida 

 (Seahorse Key). 



DisTEiBUTiON. — Gulf of St. lAawrcuce to North Carolina, Gulf of 

 Mexico. Low water to 31 fathoms, 



Scoloplos (Scoloplos) fragilis (Verrill, 1873a) 



Figure 7Q,a-f 



Anthosioma fragile Verrill and Smith, 1874, pp. 50, 71, 304.— Webster, 1886, p. 151. 

 Scoloplos fragUis Verrill, 1881, pp. 301, 309, 317, 322.— Webster and Benedict, 



1884, p. 724.— Andrews, 1891a, p. 293. — Sumner, Osburn, and Cole, 1913, 



p. 624.— Hartman, 1942b, p. 60, figs. 113-115. 

 Haploscoloplos fragilis Ilartman, 1944a, p. 340, pi. 14, fig. 5, pi. 18, fig. 6; 1945, 



p. 30, pi. 6, fig. 5; 1951, p. 76, pi. 21, figs. 1-3; 1957, p. 271, pi. 25, figs. 1-3. 



Description. — Length up to 150 mm., width up to 3 mm., segments 

 up to 250. Prostomium elongate, acutely pointed, longer than wide, 

 may be wrinkled, appearing biannulate, may be almost indistinguish- 

 able from the buccal segment (fig. 76c). Branchiae begin on about 

 setiger 16 (11-23). Thoracic setigers about 16 (15-19). Thoracic 

 neuropodia with dense fan-shaped bundles of neurosetae all ending in 

 fine tips, without crotchets (fig. 76e). 



Abdominal region with paired branchiae (usually begin on about 

 first abdominal segment). Long lanceolate postsetal notopodial 

 lobes with a ciliated ridge near the inner side (the paired ciliated 

 branchiae and paired ciliated notopodial lobes thus form 3 longitudinal 

 ciliated grooves along body). Interramal cutI at bases of the 

 neuropodia (usually begin on first abdominal segment, continuing on 

 35-50 or so segments). Bilobed neuropodia, the inner lobe gradually 

 becoming more elongate, the outer lobe short, with 2 rounded subpodal 

 papillae on first few abdominal segments, then becoming more 

 pointed, conical (thus it may appear as a 5-slashed membrane, includ- 

 ing the interramal cirrus, bilobed neuropodium and 2 subpodal papillae 

 or ventral ckri; fig. 76/). 



Proboscis, when fully extended, forming a short voluminous 

 multilobed folded sac, with 6-8 or so lobes (fig. 7Qd). The lobes are 

 broad, convoluted, changeable in form, united at the base by a broad 

 membranous expansion. When partially extended, it may appear as 

 two balloon-hke lobes. Color: dull yellow, orange brown, greenish. 



