24 U.S. NATIONAL MUSEUM BULLETIN 227 



Enipo gracilis Verrill, 1874a 



Figure 6,a-c 



Enipo gracilis Verrill, 1874a, pp. 407, 411, pi. 6, fig. 4.— Pettibone, 1953, p. 22, 



pi. 7; 1954, p. 225. 

 Polynoe gasp^ensis Mcintosh, 1874, p. 267, pi. 9, figs. 14, 15, pi. 10, figs. 12, 13.— 



Whiteaves, 1901, p. 84. 

 Polynoe tarasovi Annenkova, 1937, p. 154, figs. 29, 30; 1938, p. 137.— Uschakov 



1955, p. 137, fig. 27. 

 Polynoe gracilis Hartman, 1959a, p. 101. 



Description. — Length up to 76 mm., width including setae up to 

 9 mm., segments 45 to 74. Body elongate, slender, with sides nearly 

 parallel. Prostomium without cephalic peaks or peaks wealdy de- 

 veloped. Elytra 15 pairs, oval, smooth, translucent, small, leaving 

 middorsum and posterior end uncovered. Notosetae slender to 

 moderately stout, spinous, tapering to blunt tips. Neurosetae 

 stouter, with distal spinous regions and bare, slightly hooked tips. 

 Color: brownish middorsally; elytra pigmented smoky brown on 

 medial halves. 



Biology. — Dredged on bottoms of mud, silty clay, sand and gravel. 

 Kjiown to be commensal with the maldanid Nicomache lumbricalis 

 (Fabricius) in Alaska (Berkeley and Berkeley, 1942) and off Hahfax, 

 Nova Scotia, and Cape Cod (Pettibone, 1954), and Gaspe Bay, Gulf 

 of St. Lawrence. 



Material examined. — Gaspe Bay and Bay of Chaleurs in Gulf of 

 St. La^vrence, off Nova Scotia, Maine, Massachusetts (Georges Bank), 

 Connecticut, in 2 to 108 fathoms. 



Distribution. — Alaskan Arctic to Washington, north Japan, Gulf 

 of St. Lawrence to Connecticut. In 2 to 123.5 fathoms. 



Enipo canadensis (Mcintosh, 1874) 



Figure 6,d-/ 



Nemidia{f.) canadensis Mcintosh, 1874, p. 265, pi. 10, figs. 5-9. — Whiteaves, 1901, 



p. 85. 

 Enipo canadensis Pettibone, 1953, p. 23, pi. 8, figs. 63-72. 

 Polynoe {Enipo) pavlovskii Uschakov, 1955, p. 170, figs. 



Description.— Length up to 70 mm., width up to 8 mm., segments 

 50-90. Body long and slender, with conspicuous middorsal row of 

 reddish-brown papillae or nodules, 2 per segment in tandem (fig. Qd). 

 Elytra very small, subcircular, easily overlooked, occupying lateral 

 regions only. Prostomium with prominent cephalic peaks, with 

 2 pairs of eyes, the anterior pair much larger. Notosetae short, 

 slender, very fuiely serrated, tapering to fine capillary tips. Neuro- 

 setae of 2 kinds : Upper and few lower ones with long spinous regions, 



