130 U.S. NATIONAL ]\raSEUM BULLETIN 22 7 



small anterior pair near the bases of the palps); palps usually with 

 a well marked notch anteriorly (fig. 31a). Neiu-osetae (fig. 31, b-d) of 

 3 kinds: Single upper simple curved one; 1-3 upper compound, with 

 appendages tapering to capillary tips; 2-6 compound, with appendages 

 short, curved. Colorless. Male and female epitokes with long 

 swimming setae beginning on about setiger 18 (13-18, Wesenberg- 

 Lund). 



Biology. — Found at low water in sand, mud, among bryozoans and 

 alage. Dredged on bottoms of fine to coarse sand, muddy sand, 

 gravel, rocks, stones, and shells. 



Material examined.- — ^Gulf of St. Lawi-ence (Gaspe Bay, Lauren- 

 tian Channel), Maine (Woodbridge Island, Sheepscot River), Massa- 

 chusetts (Georges Bank; Massachusetts Bay off Plymouth; Cape Cod 

 Bay; south of Martha's Vineyard), low water to 87 fathoms. 



Distribution. — West Greenland, Faroes, Danish waters, Madeira, 

 Mediterranean, Gulf of St. La%vi'ence to Massachusetts, west coast 

 Vancouver Island, Mexico, north Japan Sea to Japan, Australia, 

 South Africa. In low water to 87 fathoms; sexual epitokes in surface 

 waters. 



Exogone dispar (Webster, 1879) 



Figure 35d 

 Paedophylax dispar Webster, 1879, p. 223, pi. 4, fig. 49, pi. 5, figs. 5{>-55; 1886, 



p. 138.— Sumner, Osburn, and Cole, 1913, p. 615.— Miner, 1950, p. 299, pi. 98. 

 Paedophylax longiceps Verrill, 1879, p. 170; 1881, p. 320, pi. 12, fig. 2.— Miner, 



1950, p. 299, pi. 98. 

 Paedophylax longicirris Webster and Benedict, 1887, p. 722, pi. 3, figs. 46-50. 

 Sphaerosyllis foriuUa Treadwell, in Cowles, 1930, p. 342.— Not Webster, 1879. 

 Exogone dispar Hartman, 1944a, p. 338, pi. 24, fig. 9, pi. 25, fig. 5; 1945, p. 16, 



pi. 2, figs. 7, 9, 10; 1951, p. 40.— Pettibone, 1954, p. 259, fig. 28/c. 



Description. — Length up to 8 mm., width up to 0.5 mm., seg- 

 ments 20-45. Prostomium with 4 eyes with lenses; palps bluntly 

 rounded anteriorly or with slight anterior notch (fig. Zbd). Neuro- 

 setae of 3 kinds: Single upper simple, sHghtly curved one; 1-2 upper 

 compound, with appendages tapering to capillary tips; 3-4 compound, 

 with appendages short, curved. Colorless or white with slightly 

 reddish tinge. Male and fem.ale epitokes with long swimming setae 

 beginning on about setiger 12 (6-15), continuing up to last few 

 segments. The females, with large purplish eggs or young attached 

 to body, may lack the swimming setae. 



Biology. — Found at low water, under rocks, in mussel beds, among 

 debris, in algal masses, on tubes of Diopatra cuprea, on pilings, on 

 hydroids (as Pennaria), in water-soaked wood. Dredged on bottoms 

 of stones, gravel, rocks, shells, bryozoan nodules, among tunicates (as 



