POLYCHAETE WORMS, PART 1 131 



sandy Amaroecium pellucidum.). They may secrete a, luucoiis sheath. 

 In the Woods Hole region, male epitokes with swiniining setae have 

 been found at the surface in the evening in June (June 8, 1954); males 

 and females with swimming setae, as v/ell as females with eggs and 

 embrj'os attached, have been dredged in June (June 14 and 24, 1954). 

 IMature epitokes are found swimnung actively iit the surface through- 

 out July and August but are even more plentiful on mussel beds, where 

 exclusively brooding females, after loss of capillary setae, are found 

 (Moore, ms.). 



Material examined. — Numerous specimens from Maine (Booth- 

 bay Harbor region), Massachusetts (Woods Hole region. Vineyard 

 Sound, 13-35 fathoms), New Jersey (Raritan Bay), Virginia (Chiiico- 

 teague Bay near Robins Marsh; Chesapeake Bay, Fish Hawk Station 

 8834). 



Distribution. — ^Arctic Alaska to Mexico, Maine to southern 

 Florida. Low water to 70 fathoms; sexual epitokes at surface. 



Exogone hebes (Webster and Benedict, 1884) 



Figure 31, c,/ 



Paedophijlax hehes Webster and Benedict, 1SS4, p. 716, pi. 3, figs. 31-36; 18S7, 



p. 721.— Miner, 1950, p. 299. 

 Exogone hebes Fauvel, 1923, p. 308, fig. 118,i7-p; 1936b, p. 32.— Wesenberg-Lund, 



1950a, p. 17; 1950b, p. 49.— Berkeley and Berkeley, 1954, p. 459.— Eliason, 



1962, p. 246. 



Description. — Length up to 10 mm., width up to 0.4 mm., segments 

 30-45. Prostomium with 4 large eyes and usually with an additional 

 smaller pair near the bases of the palps; palps rounded anteriorly, 

 without any anterior indentation. Neurosetae of anterior parapodia 

 all compound, with short hooked appendages (fig. 31e); at about the 

 middle third of the body, with an additional straight, simple, pointed 

 upper seta (fig. 31/). Body gray, creamy white or golden yellow. 

 Male and female epitokes wdth swimming setae beginning on about 

 setiger 11 (Wesenberg-Lund). 



Biology. — Found at low water in sand, gravelly sand, sandy mud, 

 in sand around roots of eelgrass, Zostera. Dredged on bottoms of 

 medium to coarse sand and shell, and gravel. 



Material examined. — Gulf of St. Lawrence (Prince Edward 

 Island), Maine (Hendricks Head Beach, Southport Island; Waites 

 Landing, Falmouth Foreside, Casco Bay), Massachusetts (Georges 

 Bank, 18-47 fathoms; Provincetown). 



Distribution. — ^West Greenland, Ireland, Denmark, English Chan- 

 nel, Morocco, Gulf of St. Lawrence to Massachusetts. Low water to 

 78 fathoms. 



