7/81 (1 spec, USNM 75328); MAFLA 2211J-7/76 (1 spec), 2314A-11/77 (1 

 spec), 2318K-8/76 (2 spec), 23181-11/77 (1 spec), 2423C-7/76 (4 

 spec), 2423-7/76 (5 spec, USNM 55811), 2528G-11/77 (1 spec), 25291- 

 6/75 (1 spec), 2531F-11/77 (1 spec), 2959H-8/77 (1 spec). 

 Supplementary Material: 



Massachusetts — Vineyard Sound, 1871, types (21 spec, USNM 9695). 

 North Carolina — Cape Lookout, Nov. 1974, in cemented material of 

 Petaloproctus colonies, H. Wilson coll., S. L. Gardiner ID. (18 spec, 

 USNM 52891). 



Gulf of Mexico — Mobile Bay, Sta. 88-30 K8b, May 1973, B. A. Vittor coll. 

 (1 spec). 

 DESCRIPTION: 



Length, to 13.4 mm (previously reported to 20 mm); width, to 2.0 mm. 

 Most specimens complete with up to 51 setigers. Prostomium rounded to 

 rectangular, with two pairs of lentigerous eyes, often with two addi- 

 tional minute eyespots (Figure 28-18a). Antennae clavate to subulate, 

 arising anteriorly on prostomium, median antenna much smaller than 

 lateral antennae. Palps with short bases and long, subulate styles, 

 similar in length and arising ventrolateral to lateral antennae. Nuchal 

 organs as narrow ridges along postectal corners of prostomium. Tentacu- 

 lar cirri subulate, indistinctly articled distally. Parapodia subbira- 

 raous, notopodia small, neuropodia well-developed, with conical presetal 

 lobes (Figure 28-18b). Dorsal cirri shorter than body width, indis- 

 tinctly articled distally. Ventral cirri digitiform to tapered. Noto- 

 podia with 0-3 (usually one) furcate setae (Figure 28-18c). Neurosetae 

 with long extension of shaft-head bifid; blades long to short, lightly 

 serrate, with faint spine or sheath below hooked tip (Figure 28-18d,e), 

 blade-length ratio 2.9-8.1:1. Posterior parapodia with additional slen- 

 der, dentate, simple neuroseta (Figure 28-18f). Anal cirri not ob- 

 served. Pharynx extending to setigers 4-10; margin smooth, without 

 papillae. Three specimens with eggs; one specimen with internal, 

 paired, pincer-like structures in setiger 14. 



REMARKS: Furcate notosetae have not been mentioned in previous descrip- 

 tions, but are present in the type material (USNM 9695). The relative 

 lengths of the two tines of the furcate notosetae are quite variable In 

 Gulf of Mexico specimens, with the longer tine less than twice to sever- 

 al times the length of the shorter tine. Some BLM-OCS specimens of P. 

 obscura were originally referred to several other species of Podarke. 

 PREVIOUSLY REPORTED HABITAT: Intertidal to 840 ra; muddy sand flats, 

 under stones, on pilings, among eelgrass, shells, hydroids, ascidians, 

 sponges, algae, etc; also found with echinoderms and the terebellid 

 Lysil'la alba . 



GULF OF MEXICO BLM-OCS OCCURRENCE: Widespread in northeastern Gulf 

 (Figure 28-17); 10-189 m; coarse to fine sand, silty fine to very fine 

 sand, clayey sand and silt, sandy silt. 



DISTRIBUTION: Massachusetts to Florida, Bermuda, Caribbean, Gulf of 

 Mexico. 



Genus Nereimyra Blainville, 1828 



TYPE SPECIES: Nereis punctata 0. F. Muller, 1776. 



REFERENCES: 



Fauvel, 1923:240 (as Castalia ). 



Ushakov, 1955:195 (as Castalia). 



28-21 



