128 U.S. NATIONAL JVIUSEUM BULLETIN 227 



Genus Amblyosyllis Grube, 1857 



Pterosyllis Claparfede, 1863. Type (monot.vpy) : Pterosyllis formosa Claparede, 



1863. 

 Galtiola Johnston, 1865. Type (monotypy) : Gaitiola spectabilis Johnston, 1865; 



=Amhlyosyllis formosa (Claparfede, 1863). 



Type (monotypy) : Amblyosyllis rhombeata Grube, 1857. Contains 

 only one New England species. 



Amblyosyllis finmarchica (Malmgren, 1867) 



Figure 34,e,f 



Gaitiola finmarchica Malmgren, 1867, p. 38, pi. 6, fig. 36. 



Gattiola cincinnata Verrill, 1874b, p. 394, pi. 2, fig. (no description). 



Pterosyllis cincinnata Webster and Benedict, 1887, p. 719. — Sumner, Osburn, and 



Cole, 1913, p. 615. 

 Pterosyllis finmarchica Annenlcova, 1938, p. 152, fig. 4. — Uschakov, 1955, p. 187, 



fig. 54. 

 Amblyosyllis cincinnata Hartman, 1944a, p. 338, pi. 25, fig. 7. 

 Amblyosyllis lineata Miner, 1950, p. 292, pi. 96.— Not Grube, 1863. 



Description. — Length up to 10 mni., width without setae up to 

 2 mm., segments 15 (13 setigerous, tentacular segment fused with 

 prostomium, achaetous penultimate segment with 2 pau's long to 

 short cirri, fig. 34/). Body short, flattened, composed of few deeply 

 incised segments. Prostomium and fused tentacular segment with 3 

 long filiform antennae, 2 pairs large eyes, closel}^ approximated, a pair 

 of small palps appearing as 2 bosses on the ventral surface, not visible 

 dorsally, 2 pairs long filiform tentacular cirri, the upper pair consider- 

 ably longer than the lower pair, and a pair of prominent ciliated 

 nuchal epaulettes. Dorsal and anal cirri long, slender, filiform, in- 

 distinctly to quite distinctly articulate, often coiled or spiralled. 

 Ventral cirri extend about as far as the setigerous lobes. Setae 

 compound, with terminal blades hooked, with tips entire. Proboscis 

 very long, sinuous, armed with a circle of papillae and a circle of teeth. 



When mature, become modified as sexual epitokes, eyes become 

 enlarged, swmmiing setae develop, beginning on setiger 6 and con- 

 tinuing posteriorly. White, transparent, with dense yellowish ma- 

 terial inside, beginning in setiger 5. 



Biology. — Found at low water among boulders. Dredged on bot- 

 tom of rocks and shells, in holdfasts of Laminaria. Young may appear 

 in surface waters. 



Material examined. — Newfoundland (Ferryland, low water, 

 July 29, 1954, E. L. Bousfield), Maine (Eastport, Muscongus Bay 

 near Hog Island, 2 fathoms). 



Distribution. — Finland, Newfoundland, Maine, north Japan Sea. 

 Low water to 30 fathoms; surface. 



