POLYCHAETE WORMS, PART 1 265 



Description. — I^engtli up to 150 mm., width up to 1 mm., seg- 

 ments up to 200. Body long, threadlike. Parapodia with presetal 

 lobe short, rounded, with postsetal lobe longer, tapered (fig. 70c). In 

 far posterior region, postsetal lobe becomes elongate, digitiform, erect 

 (fig. 70d). Anterior parapodia with simple, limbate, curved setae with 

 long tips (fig. 70(7). Simple hooded hooks beginning on about setiger 

 9 (1-17 ; fig. 70, h,j) . Setae and acicula yellow or pale. Proboscis with 

 maxillae ii each with 4-5 teeth; maxillae iii and iv each with a single 

 tooth. Color: iridescent, light to dark red, yellowish orange to 

 greenish. 



Biology. — Found at low water burrowing in mud and sand beneath 

 stones, in compact sand mixed more or less with mud, and in sandy 

 mud flats close to the low water mark. Rarely found on pile scrap- 

 ings. Dredged on bottoms of gravel with shells, mud, compact mix- 

 tures of mud and sand, various combinations of mud, sand, gravel, 

 with sponges, shells, amphipod and worm tubes. Common among 

 the sandy tunicate Amaroecium pellucidum. Some gelatinous egg 

 masses with large, dull greenish yolky eggs found in the sand (Cutty- 

 hunk Harbor, Mass., June 16, 1954). Similar large yolky eggs found 

 inside some individuals found in the same area. The gelatinous 

 masses with the eggs and larvae were in the form of spherical masses 

 attached to the surface of the mud; when the flats were covered 

 with water, they waved to-and-fro with the passing currents. 



The early development of Lumbriconereis sp. from Newport, Rhode 

 Island, described by Fewkes (1883) may refer to this species. The 

 eggs were found in all stages of growth in the months of June, July, 

 and August. Early development took place within the gelatinous 

 egg masses, after which crawling larvae emerged. 



Material examined. — Maine (Muscongus Bay near Hog Island, 

 3 fathoms; Ebenecook Harbor, Southport Island, 3 fathoms; north 

 end Long Ledge, Sheepscot River, 3 fathoms). New Hampshire 

 (Portsmouth Harbor, 2 fathoms); Massachusetts (Georges Bank, 

 37-182 fathoms; Plum Island; Barnstable and Wellfleet on Cape Cod, 

 Massachusetts and Cape Cod Bays, Vineyard Sound); Florida (Sea- 

 horse Key). 



Distribution. — Maine to off Chesapeake Bay, Gulf of Mexico. 

 Low water to 182 fathoms. 



Lumbrineris impatiens (Claparede, 1868) 



Figure 67j 



Lumbriconereis maculaia Treadwell, 1901b, p. 198, figs. 42-44. 

 Lumbriconereis near assimilis Mcintosh, 1903, p. 158, pi. 13, figs. 42-43. 

 Lumbriconereis impatiens Fauvel, 1923, p. 429, fig. 171, a-z; 1933, p. 38; 1953, 



p. 267, fig. 134,a-i; 1955, p. 8; 1957b, p. 214.— Annenkova, 1937, p. 167; 



1938, p.^168.— St0p-Bowitz, 1948a, p. 65.— Wesenberg-Lund, 1949, p. 316; 



