284 U.S. NATIONAL MUSEUM BULLETIN 227 



lobes with 7-9 papillae, with several rows of stout yellow pseudo- 

 crotchets (with tips enclosed in sheaths tapered to fine tips) or 

 crotchets (tips blunt, sheaths broken), with a posterior row of crenu- 

 late capillary setae. Posterior few (3-5) thoracic neuropodia with 

 4-5 dark heavy lanceolate setae, the upper one often extending out 

 further than the others. Abdominal region with neuropodia unequally 

 bilobed, the upper lobe short, rounded, the lower one longer, pointed. 

 Without interramal cirri; with small conical subpodal papilla or 

 ventral cirrus (fig. 75^). Subpodal ventral or stomach papillae on 

 about setigers 13-17, up to 20 papillae on each side. 



Biology. — Dredged on bottoms of mud, muddy sand, and ooze. 



Material examined. — Off Long Island Sound {Albatross Station 

 2105, 37°50' N., 73°03' W., 1,395 fathoms). 



Distribution. — Greenland, Kara Sea, Norway, Danish waters, 

 North Sea, Mediterranean, Davis Strait, off Long Island Sound. 

 In 690 to 1,395 fathoms. 



Orbinia (Orbinia) swani Pettibone, 1957a 



Figure 75,d,e 

 Orbinia swani Pettibone, 1957a, p. 161, fig. 1. 



Description. — Length? (more than 50 mm.), width up to 3 mm., 

 segments nmnerous. With middorsal glandular areas beginning 

 between setigers 6 and 7. Thoracic setigers about 31 (24-31). 

 Thoracic neuropodial postsetal lobes with 5-18 papillae and with 

 4-5 rows of crotchets. Crotchets golden yellow, gently curved, 

 smooth or faintly spinous. Two groups of crenulate capillary setae 

 at the upper and near the lower part of the lobe (fig. 75e) . Abdominal 

 region with bilobed neuropodial lobe, the outer lobe slightly longer 

 than the inner lobe. Without interramal cirri; with a prominent 

 conical subpodal papilla or ventral cirrus at the base (fig. 75c?). 

 Subpodal ventral papillae on about setigers 18-40, up to 18 papillae 

 on each side in transverse rows; most developed papillae nearly reach 

 mid ventral line. Extended proboscis lobulated, with about eight 

 short wide lobes (fully extended?). Color: colorless or yellowish 

 except for prominent red blood vessels. 



Biology. — Found at low water in sand. Dredged on bottoms of 

 fine to coarse sand. Gut filled with sand grains. 



Material examined. — Gulf of St. Lawrence (Bay of Chaleurs), 

 Nova Scotia (east side Cape George, September 27, 1957, R. Lane, 

 J. McNeill), Maine (York, Sea Point near Kittery), Massachusetts 

 (Georges Bank, Albatross III, 41°31' N., 68°23' W., 25 fathoms; 

 40°48' N., 68°25' W., 25 fathoms, 1957, R. Wigley). 



Distribution. — Gulf of St. Lawrence to Massachusetts, Low 

 water to 25 fathoms. 



