rOLYCHAETE WORMS, PART 1 183 



Biology. — Drodged on bottoms of shells, sand, and gravel. Ap- 

 pears to be a cold water Ai'ctic form. Sexual epitokes appear sporad- 

 ically. 



Material examined. — Few small specimens from Massachusetts 

 (Cape Cod Bay near Cape Cod Canal and off Provincetown, off Mar- 

 tha's Vineyard), in 10-75 fathoms. 



Distribution. — Widely distributed in the Arctic. Also Iceland, 

 Faroes, Denmark, Hudson Bay to Massachusetts (Cape Cod), Bering 

 Sea to Oregon, north Japan Sea. In low water to 439 fathoms; 

 heteronercids at surface. 



Nereis {Nereis) grayi Pettibone, 1956b 



Figure 42^' 

 Nereis (Nereis) grayi Pettibone, 195Gb, p. 282, fig. 3. 



Description. — Body long, slender. Tentacular cirri long, tapering, 

 the longest extend to setiger 6. Parapodia similar throughout the 

 length of the body. In the anterior region, notopodium with 2 sub- 

 equal, elongated, conical, sharply pointed ligules. Neuropodium with 

 bluntly conical setigerous lobe and lower, slightly shorter ligule. 

 Notosetae consist of homogomph spinigers. Upper group of neuro- 

 setae consist of homogomph spinigers and heterogomph falcigers; 

 lower group of neurosetae consist of heterogomph spinigers and falci- 

 gers with rather long blades. In the middle and posterior regions, 

 the setae are similar except that the notosetae consist of a few (1-2) 

 homogomph falcigers with short, oval blades (begin on about setiger 

 27). Acicula dark. Dorsal and ventral cirri shorter than the ligules. 



Proboscis with brown amber-colored jaws; without paragnaths on 

 areas i, iii, v, vii-viii; with paragnaths few and small on the other 

 areas; area ii with 2-3 denticles; area iv, triangular group of 10-13; 

 area vi with 3-4 denticles. Colorless preserved. Sexual epitokes 

 unknown. 



Biology.— Found in mud, in elongate mud tubes of the maldanid 

 Alaldanopsis elongata (Verrill). Dredged in about 10 fathoms on 

 bottoms of silty clay, fine sand (the maldanid was also common 

 Buzzards Bay, II. Sanders). 



Material examined. — Few specimens from Massachusetts (Ilad- 

 ley Harbor, Uncatena Island, M. Gray; Buzzards Bay, about 10 

 fathoms, H. Sanders). 



Distribution. — Massachusetts (Woods Hole region). Low water 

 to 10 fathoms. 



