POLYCHAETE WORMS, PART 1 305 



Biology. — Dredged on bottoms of soft mud and sandy mud. They 

 are evidently bottom-deposit feeders; sand grains were noted in the 

 gut. Females distended with numerous medium-size white eggs 

 (massed in postbranchial region, eggs not as large as in A. jeffreysii or 

 A. suecica) were found in Maine in August (Ebenecook Harbor, 

 August 10, 1955) and in Massachusetts in July (Massachusetts Bay, 

 July 27, 1953) and August (Cape Cod Bay, August 26, 1954). 



Material examined. — Maine (Middle Cove and Love's Cove, 

 Ebenecook Harbor, Southport Island, 3-7 fathoms), Massachusetts 

 (Cape Cod Bay, 14-27 fathoms; Massachusetts Bay off Plymouth, 

 12-17 fathoms). 



Distribution.— Maine, Massachusetts. In 3 to 32 fathoms. 



Aricidea {Aricidea) albatrossae Pettibone, 1957c 



Figure 81 



? Aricidea fragilis Mcintosh, 1885, p. 354, pi. 43, figs. 4, 5, pi. 22o, fig. 18. — Not 



Webster, 1879. 

 Aricidea (Aricidea) albatrossae Pettibone, 1957c, p. 354, fig. 1. 



Description. — Length more than 15 mm., width up to 2 mm., 

 segments more than 54. Anterior end greatly flattened. Prostomial 

 antenna short, subulate, extending back to first setiger. Branchiae 

 26-30 pairs, straplike, with short slender tips. Notosetae and 

 neurosetae of posterior region few, slender, capillary, inconspicuous. 



Biology. — Dredged in deep water m grey, green, or blue mud and 

 ooze. 



Material examined. — Off Massachusetts to off Chesapeake Bay, 

 Albatross stations, 788 to 1,395 fathoms. 



Distribution. — Deep North Atlantic, off Massachusetts to off 

 Chesapeake Bay. In 788 to 1,395 fathoms. 



Aricidea {Aricidea) jeffreysii (Mcintosh, 1879) 



Figure 80,a-e 



Aricidea nolani Webster and Benedict, 1887, p. 740 (part). 



Aricidea jeffreysii Fauvel, 1927, p. 75, fig. 25,a-e. — Berkeley and Berkeley, 1950, 



p. 55, fig. 3.— Southward, 1956, p. 269.— Hartman, 1957, p. 322.— Eliason, 



1962, p. 261. 

 ? Not Aricidea jeffreysi Renaud, 1956, p. 26, fig. 18,a-e. 



Description. — Length up to 20 mm., width up to 1.5 mm., segments 

 up to 120. Prostomial antenna short, fihform to clavate, often project- 

 ing anteriorly or extending back to first setiger. Branchiae usually 

 13 pairs (11-22), straplike, tapering gradually to pointed tips. 

 Notosetae of posterior region few, slender, capillary. Neurosetae of 

 posterior segments of 2 kinds: (1) Long, slender, capillary setae and 

 (2) shorter, stouter, slightly hooked crotchets with a faint sheath, 

 up to 5-8 in number arranged in transverse row (fig. 80,d,e). 



