medially. Ventral cirri digitif orm, extending past parapodia anterior- 

 ly. Composite falcigers slender, bidentate, with short serrations and 

 small teeth (Figure 30-134b-e). Blade-length ratios 1.3-1.6 anteriorly, 

 1.1:1 medially, 1.3-1.4:1 posteriorly. Superior simple seta minutely 

 bifid (Figure 30-134f ), present posteriorly; inferior simple seta bi- 

 dentate (Figure 30-134g). Pharynx extending to setigers 6-8; margin 

 smooth and surrounded by ten soft papillae; middorsal tooth located in 

 anterior third. Proventricle located in setigers 6-10 or 9-17, with 26- 

 34 muscle cell rows. Ventricle occupying two setigers. Proventricle 

 about same length as pharynx and 1.7-1.8 times longer than wide. 

 REMARKS: This species has setae similar to those of Syllis ( Typosyllis ) 

 sp. B. It differs from the latter in having longer dorsal cirri and a 

 proventricle length:width ratio less than 2:1. Syllis (T.) sp. D was 

 originally confused with S_. alternata and S. hyalina in BLM-OCS collec- 

 tions. 



GULF OF MEXICO BLM-OCS OCCURRENCE: One station off central Florida and 

 one off central Texas (Figure 30-133); 43-75 ra; coarse sand. 



Syllis (Typosyllis) cf. alternata Moore, 1908 

 Figures 30-135, 136a-d 



Syllis alternata Moore, 1908:323, figs. a-f. 



Typosyllis alternata — Imajima, 1966:273, fig. 58a-l. 



Syllis ( Typosyllis ) alternata — Gardiner, 1976:141, fig. 13b, c. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



MAFLA 2211J-11/77 (1 spec), 2528A-6/75 (1 spec, USNM 65691). 

 Supplementary Material: 



Alaska — near Naha Bay, Behm Canal, S. E. Alaska, Sta. 4228 Alb. 1903, 

 203-245 m (USNM 5542, cotype); Dundas Bay, Icy Strait, Sta. 4261 Alb. 

 1903, 16-18 m (USNM 5765, cotype). 

 DESCRIPTION: 



Length, 5.6+ mm (previously reported to 23 mm); width, to 0.9 aim (pre- 

 viously reported to 0.8 mm). Body stout anteriorly; both specimens 

 incomplete. Prostomium irregularly rounded, trilobed anteriorly, with 

 four lentigerous eyes, with or without two ocular spots (Figure 30- 

 136a). Median antenna with 13-16 articles, lateral antennae with 11-12 

 articles. Palps short, bluntly triangular. Nuchal organs sometimes 

 lightly pigmented. Dorsal tentacular cirri with 17-19 articles, ventral 

 ones 'with nine articles. Dorsal cirri with 10-27 articles anteriorly, 

 12-21 articles medially. Ventral cirri digi^iform, extending well be- 

 yond parapodia anteriorly. Composite falcigers bidentate with short, 

 fine serrations, and teeth at oblique angle tc long axis of blade (Fig- 

 ure 30-136b-d), blade-length ratios 1.7:1 throughout. Superior and 

 inferior simple setae not observed. Acicula distally pointed, numbering 

 four per parapodium anteriorly. Pharynx extending to setigers 11-13; 

 middorsal tooth subterminal. Proventricle extending from setigers 12-13 

 to 20-21, with 41-42 muscle cell rows. Ventricle occupying one setiger. 

 Pharynx 0.8-1.3 times length of proventricl ; proventricle about four 

 times longer than wide. 



REMARKS: Gulf of Mexico BLM-OCS specimens differ from the types in 

 having setal blades with more strongly developed teeth and longer serra- 

 tions. 



30-141 



