Composite falcigers having short, unidentate blades with coarse serra- 

 tions (Figure 30-120b), sometimes appearing subbidentate anteriorly with 

 distal serration slightly enlarged (Figure 30- 123c). Setae of midbody 

 region broad, sometimes ypsiloid (Figure 30-120d). Blade-length ratios 

 1.2-1.4:1 anteriorly, about 1:1 medially and posteriorly. Superior seta 

 in medial to posterior regions of larger specimens enlarged, appearing 

 simple due to loss of blade (Figure 30-120e). Superior and inferior 

 simple setae of posterior region slender, subbidentate, minutely ser- 

 rate. Pharynx extending to setigers 2-12; middorsal tooth subterminal. 

 Proventricle extending from setigers 3-13 to 7-22, with 37-40 muscle 

 cell rows. Ventricle occupying three setigers. Pharynx 0.6-1.3 times 

 length of proventricle; proventricle 2.8-4.3 times longer than wide. 

 REMARKS: This species is referred to the subgenus Typosyllis rather 

 than Syllis because the simple setae of the midbody region appear to be 

 formed directly by loss of the setal blade (in many cases the sheath 

 from the base of the blade remains intact), and are not consistently 

 present in all specimens. Syllis ( Typosyllis ) arnica and S. (T_.) armil- 

 laris were confused in BLM-MAFLA collections. 

 PREVIOUSLY REPORTED HABITAT: Intertidal; vermetid reefs. 

 GULF OF MEXICO BLM-OCS OCCURRENCE: Two stations off Florida (Figure 30- 

 119); 27-36 m; medium to fine sand. 



DISTRIBUTION: Mediterranean, eastern N. Atlantic, east coast of 

 Florida, Gulf of Mexico. 



Syllis (Typosyllis) armillaris (0. F. Miiller, 1771 in 0. F. Miiller, 1776) 



Figures 30-121, 122a-g 



Nereis armillaris 0. F. Miiller, 1771 i_n 0. F. Miiller, 1776:217. 



Syllis ( Typosyllis) armillaris — Fauvel, 1923:264, fig. 99a-f. 



Syllis ( Typosyllis ) armillaris — Day, 1967:249, fig. 12.4. a-d. 



Typosyllis ( Typosyllis ) armillaris — Hartmann-Schroder , 1971:149, fig. 



50a-c. 



Syllis ( Typosyllis ) armillaris — Uebelacker, 1982b:585, fig. 2a-l. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2211B-7/76 (1 spec), 2211H-7/76 (1 juv.), 2315A-11/77 (2 spec), 

 2528G-11/77 (4 spec), 2528-2/78 (2 spec, USNM 55826), 2854E-8/77 (1 

 spec.) . 

 DESCRIPTION: 



Length, to 14.5 mm (previously reported to 50 mm); width, to 0.75 mm. 

 Body long, cylindrical; complete specimens with up to 120 setigers. 

 Prostomium trilobed anteriorly, with four lentigerous eyes, and 0-2 

 anteromedial ocular spots (Figure 30-122a). Median antenna with 13-20 

 articles, lateral antennae with 8-13 articles. Palps broad, flat basal- 

 ly, rounded distally. Dorsal tentacular cirri with 9-14 articles, 

 ventra. ones with 6-16 articles. Dorsal cirri cirriform anteriorly with 

 5-31 articles, becoming fusiform medially with 2-20 articles. Ventral 

 cirri clava_e to fusiform, sometimes extending slightly beyond parapodia 

 anteriorly. Pygidium with a slender, midventral cirrus and paired cirri 

 having 12-20 articles. Composite falcigers bidentate anteriorly (Figure 

 30-122b,c) and posteriorly, unidentate or subbidentate in midbody region 

 (Figure 30-122d,e). Blade-length ratios 1.5-2.4:1 anteriorly, 1.1-1.3:1 

 medially, 1.2-1.7:1 posteriorly. Slender, minutely bidentate superior 



30-129 



