spec, USNM 86974), 23161-7/76 (1 spec), 2535C-6/75 (1 spec), 2645G- 

 2/78 (1 spec); CTGLF 04-6/78 (1 spec, USNM 86980); STOCS 1/II-2 2/76 

 (1 spec, USNM 86977), 1/II-3 2/76 (1 spec, USNM 86978), 6/IV-3 Sp/76 

 (1 spec, USNM 86979); IXTOC S50-4 11/79 (4 spec, USNM 86976). 

 Supplementary Material: 



New York — Crab Meadow State Park, Long Island (AMNH 2893, holotype). 

 DESCRIPTION: 



Length, 12+ mm (previously reported to 15 mm); width, to 2.0 ram. Larg- 

 est specimen incomplete with 65 setigers. Prostomium (Figure 29-6a) 

 with long, smooth, filiform antennae, median antenna extending back to 

 about setiger 6. Palps with small, digitiform palpostyles. Dorsal and 

 ventral tentacular cirri equal in length. Dorsal cirri of setiger 1 

 extremely long, filiform (Figure 29-6a,b); subsequent ones broad basal- 

 ly, tapering to pointed tips (Figure 29-6a,c,d). Ventral cirri absent 

 from setiger 2. Body with smooth integument, sometimes with distinct 

 annulations dorsally on tentacular and first few setigerous segments 

 (Figure 29-6a). Hooked acicular notosetae beginning on setigers 4-6 

 (Figure 29-6a), accompanied by internal notoaciculum (Figure 29-6c), and 

 occasionally an emergent tapering seta (Figure 29-6d,e). Neurosetae 

 tapering to fine tips, serrate along one margin (Figure 29-6f); shorter 

 neurosetae located anteriorly within neuropodial fascicle, with more 

 distinct serrations (Figure 29-6g). Pygidium (Figure 29-6h) with pair 

 of long, filiform anal cirri. 



REMARKS: Specimens from Gulf of Mexico BLM-OCS material fit quite well 

 the description of Sigambra tentaculata given by Pettibone (1966:182), 

 although on smaller specimens the hooked notosetae begin on setiger 5 or 

 6 rather than 4. The emergent capillary notosetae have not been men- 

 tioned for S. tentaculata , but since they have occasionally been found 

 on specimens of S_. bassi (Hartman, 1945), their presence is not con- 

 sidered of specific importance. 



PREVIOUSLY REPORTED HABITAT: Intertidal to 5121 m; mud, sand, sand 

 mixed with mud and shell fragments. 



GULF OF MEXICO BLM-OCS OCCURRENCE: Scattered throughout northern Gulf 

 (Figure 29-5); 15-117 m; coarse to fine sand, silty fine to very fine 

 sand, clayey sand, clayey and sandy silt, sandy silty clay. 

 DISTRIBUTION: Black Sea, Red Sea, South Africa, northeastern South 

 America, Gulf of Mexico, New England to Florida, North Pacific, southern 

 California. 



Sigambra bassi (Hartman, 1945) 

 Figures 29-7, 8a-e 



Ancistrosyllis bassi Hartman, 1945:15; 1947b:501, pi. 61, figs. 1-7; 



1951a:36, pi. 11, figs. 1-6. 



Sigambra bassi — Pettibone, 1966:186, fig. 16a-f. 



Sigambra bassi — Gardiner, 1976:123, fig. 9d-f. 



MATERIAL EXAMINED: 



Gulf of Mexico BLM-OCS: 



SOFLA 2C-11/80 (4 spec, USNM 86966); MAFLA 2207D-8/77 (1 spec, USNM 



86964), 22071-8/77 (1 spec), 2209J-6/76 (1 spec), 2318J-7/76 (1 



spec), 2419C-8/77 (1 spec, USNM 86965), 2424C-7/76 (1 spec), 2424G- 



7/76 (1 spec); STOCS 1/II-12 W/76 (1 spec, USNM 86969), 4/II-5 w/76 (1 



29-10 



