166 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



2. Notopoclial hooked setae beginning on setiger 3-6. Dorsal cirri of first 



setiger longer than following 3 



Notopodial hooked setae beginning on setiger 7-13 4 



3. Short median antenna. Notopodial hooked setae beginning on setiger 4-6. 



A. groenlandica, p. 166 

 Without median antenna. Notopodial hooked setae beginning on setiger 3. 



A. matsunagaensis. 



4. Notopodial hooked setae beginning on setiger 7. Without median antenna. 



With paired deep-set minute eyes. Dorsal cirri small, ovoid. Ventral 



cirri small, near tips of parapodial lobes A. falcata 



Notopodial hooked setae beginning on setiger 13 (not emergent at first). 

 With short median antenna (sometimes diiBcult to detect). Without eyes. 

 Dorsal cirri short, subulate. Ventral cirri larger, at base of neuropodial 

 lobes A. breviceps, p. 168 



5. Ventral cirri beginning on setiger 4. Notopodial hooked setae beginning 



on setiger 4. Tentacular cirri 1 pair. Without lateral antennae. Without 



notoacicula. Eyespots 2 pairs A. quelllna 



Ventral cirri beginning on setiger 3. Tentacular cirri 2 pairs. With lateral 

 antennae. With notoacicula 6 



6. Notopodial hooked setae beginning on setiger 3. Eyes 1 pair 7 



Notopodial hooked setae beginning on setiger 6. Without eyes 8 



7. Without median antenna. Lateral antennae extending beyond palps. An- 



terior part of digestive tract not looped A. papillosa, p. 170 



Short median antenna, which may be partially hidden by tentacular segment. 

 Lateral antennae shorter than palps. Anterior part of digestive tract 

 looped A. hartmanae, p. 172 



8. Without median antenna. Notopodial acicular lobe low, thick, not 



elongated, with short conical dorsal cirri A. hamata, p. 168 



Small median antenna (easily overlooked). Notopodial acicular lobe en- 

 larged, conical, extending nearly to tip of neuropodial lobe, with small 

 dorsal cirri indistinctly separated from notopodial lobe . . A. jonesi, p. 173 



Ancistrosyllis groenlandica Mcintosh 



Figure 3 



Ancistrosijllis groenlandica Mcintosh, 1879, p. 502, pi. 65, figs. 3, 20. — Pettibone, 

 1963, p. 110, fig. 30.— Hartman, 1965, p. 71. 



Material examined: North Atlantic, Albatross III, 42°10' N., 

 69°18' W., 100 fms., 1955, R. Wigley; Delaware sta., 42°3r N., 

 67°48' W., 175 fms., 1959, R. Wigley. Gulf of St. Lawrence, P. 

 Brunei. 



Description: Length to 40 mm., width to 1 mm., segments to 70. 

 Body flattened dorsoventrally, widest in middle region, tapering 

 anteriorly and posteriorly, with parapodia deeply cut. Prostomium 

 with large palpophores and small button-like palpostyles (easily 

 overlooked); 3 small subequal antennae shorter than palps; without 

 eyes. Tentacular segment indistinct from prostomium, with 2 pairs 

 of short subequal tentacular cirri, similar to antennae; irregular lateral 

 pigmented areas may be present (fig. 3a; these are probably the large 

 lateral eyes mentioned and figured by McLitosh). Dorsal cirri of 



