260 U.S. NATIONAL MUSEUM BULLETIN 227 



gelatinous masses attached to Zostera and Sargassum, where early 

 development takes place. Development is much abbreviated and 

 rapid, with adult structures appearing early, the larvae lacldng 

 pelagic or swimming stages. Larvae of 4 to 7 setigerous segments 

 creep out of the gelatinous masses. 



Material examined. — New Brunswick (St. Andrews), Maine 

 (41°09' N., 66°02' W.) to off North Carolina (35°02' N., 75°12' W.), 

 numerous Albatross Stations, 48 to 1,290 fathoms; Florida (Seahorse 

 Key). 



Distribution. — A cosmopolitan species. Greenland, Norway, 

 Iceland to France, Mediterranean, Adriatic, off New Brunswick to 

 North Carolina, Gulf of Mexico, Queen Charlotte Islands to California, 

 Mexico, Peru, Japan, Indian Ocean, Red Sea, Persian Gulf, West 

 and South Africa. Low water to 1,290 fathoms. 



Lunibrineris acuta (Verrill, 1875) 



Figure 67,g-i 



Lumbriconereis acuta Verrill, 1875, p. 39, pi. 3, fig. 5. 



Lximhrineris acuta Hartman, 1942c, p. 114, fig. \Q,a-d\ 1944a, p. 340, pi. 17, 

 fig. 6; 1944d, p. 145, pi. 8, figs. 176-177. 



Description.- — Length up to 40 mm., width up to 1 mm., segments 

 up to 125. Parapodia very small, inconspicuous on about first 10 

 setigers; rest of parapodia with short, cushionlike presetal lobe and 

 a longer prominent postsetal lobe. Parapodia of anterior region with 

 limbate setae only; in middle region, with limbate setae and simple 

 hooded hooks with bidentate tip (fig. Q7,h,i). Acicula pale yellow. 

 Proboscis with maxillae ii each with 3 stout teeth; maxillae iii and 

 IV each with a single tooth. 



Biology.- — ^Found at low water on mud and sand flats. Dredged on 

 bottoms of mud and coarse to medium sand. Found in stomach of 

 haddock (Georges Bank, 1953, R. Wigley). 



Material examined. — Off Maine (Albatross III, 41°23' N., 

 66°44' W., 1953, R. Wigley), Massachusetts (Georges Bank, 19-47 

 fathoms; off Martha's Vineyard, southwest ledge). 



Distribution.— Off Maine to Long Island Sound, southern 

 Cahfornia to western Mexico. Low water to 103 fathoms. 



Lumbrineris brevipes (INIcIntosh, 1903) 



Figure GSh 



Lumbriconereis brevipes Mcintosh, 1903, p. 147, text-fig. 3, pi. 12, figs. 33-34. 

 Ninoefusca Moore, 1911, p. 285, pi. 19, figs. 110-118. 

 Lumbrinereis aniarctica Monro, 1930, p. 138, fig. 51. 



Description. — Length ? (none complete), width up to 2 mm. Pro- 

 stomium rather sharply conical, with a deep nuchal pocket between the 



