POLYCHAETE WORMS, PART 1 141 



longitudinal bands or lateral bands ma}^ be missing; egg sac formed 

 of a single lobe, with eggs coral pink. Male stolon with 6 prena tatory, 

 23-35 natatory, 21-30 postnatatory setigers. 



Biology. — Found at low water in tide pools, under rocks in sponges, 

 on pilings, among shells, sponges, hydroids, mussels, in holdfasts of 

 algae (as Laminaria). Dredged on bottoms of mud, coarse sand, 

 gravel, stones, with shells, sponges, algae. Stem form, with sexual 

 buds forming, found in April, June, July (in Maine, Alassachusetts) ; 

 sexual stolons found in July and August (in Canadian Arctic, Grain- 

 ger, 1954), in August (in Arctic Alaska, Pettibone, 1954), in June 

 and August (Gulf of St. Lawrence), November (Maine, New Hamp- 

 shire), and December (Georges Bank). 



Material examined. — Gulf of St. Lawi'ence (Bay of Chaleurs, 

 6-30 fathoms), Maine (Machias Bay; Boothbay Harbor region; the 

 Nubble, York; Albatross 111, 41° 22' N., 69° 17' W., 56 fathoms, 

 December 19, 1955, R. Wigley, female stolon). New Hampshire 

 (Newcastle, Rye Harbor), Massachusetts (Georges Bank, Marble- 

 head, Woods Hole region, Martha's Vineyard, dredged in Vineyard 

 Sound). 



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

 Labrador to Massachusetts, Bering Sea to British Columbia, north 

 Japan Sea. In low water to 267 fathoms; sexual forms at surface. 



Autolytiis fasciatus (Bosc, 1802) 



Figures 37,a,b; 38; 39 



Nereis fasciata Bosc, 1802, p. 144, pi. 5, fig. 6. 



Proceraea ornata Verrill, 1873a, p. 746.— Wilson, 1900, p. 351.— Mensch, 1900a, 



p. 270; 1900b, p. 89. 

 Not Proceraea fasciata Langerhans, 1879, p. 581. 

 Autolytus ornatus not Verrill, 1879, p. 170 i=A. prolif er) .^Yevrill, 1882, p. 367. — 



Not Sumner, Osburn, and Cole, 1913, p. 616 (•=A. proUfer). — Hartman, 



1942b, p. 43; 1945, p. 16.— Miner, 1950, p. 294, pi. 96.— Allen, 1957, p. 49. 

 Proceraea tardigrada Webster, 1879, p. 227. — Andrews, 1891a, p. 282. — Wilson, 



1900, p. 351.— Mensch, 1900b, p. 89. 

 Proceraea? coerulea Webster, 1879, p. 230. 

 Autolytus longisetosus Hartman, 1944a, p. 338, pi. 13, fig. 1 (male stolon, with 



transverse brown bands). — Not Oersted, 1843. 

 Autolytusf alexandri Hartman, 1944a, p. 338, pi. 13, fig. 2 (female stolon, with 



brown bands, with 6 prenatatory setigers) .^ — -Not Malmgren, 1867. 



Description. — Stem form (fig. 38) length up to 30 mm., width up 

 to 1 mm., segments up to 100; nuchal epaulettes conspicuous, cres- 

 centic, extending on first setiger; second pair dorsal cirri similar to 

 lower tentacular cirri; body white or pale yellowish, with wide red- 

 dish brown transverse bands, 1 per segment, on nearly every segment 

 or on every second to fourth segment, usually with a spot of pigment 

 on the ventral side of the neuropodia. 



