9a. Proventricle usually between 2.3 and 3.8 times longer than wide; 



dorsal cirri long or short 10 



9b. Proventricle at least four times longer than wide; dorsal cirri 



long (Figure 30-136a) 



Syllis (Typosyllis) cf. alternata, p. 30-141 



10a. Margin of pharynx surrounded by 14-20 soft papillae (Figure 30- 



138g) Syllis (Typosyllis) corallicoloides, p. 30-143 



10b. Margin of pharynx surrounded by ten soft papillae 11 



11a. Proventricle with 21-26 muscle cell rows; superior simple seta 

 with truncate tip having shelf-like lateral projection (Figure 30- 

 140d) Syllis (Typosyllis) sp. E, p. 30-145 



lib. Proventricle with 27 or more muscle cell rows; superior simple 

 seta with entire or bifid tip (Figures 30-142e, 144f) 12 



12a. Blades of composite setae with fine serrations and pointed 

 teeth; blade-length ratio of composite falcigers in medial to 



posterior regions about 1:1 (Figure 30-142c,d) 



Syllis (Typosyllis) gerlachi, p. 30-145 



12b. Blades of composite setae with fine or coarse serrations and 

 rounded teeth; blade-length ratio of composite falcigers in medial 

 to posterior regions about 1.5-2:1 13 



13a. Dorsal cirri mostly short, with less than 20 articles (Figure 30- 

 144a); dorsum unpigmented. . .Syllis (Typosyllis) sp. B, p. 30-148 



13b. Dorsal cirri mostly long, with up to 45 articles (Figure 30-146a); 

 dorsum often with light brown transverse stripes anteriorly. . . . 

 Syllis (Typosyllis) prolifera, p. 30-150 



Syllis (Typosyllis) arnica Quatrefages, 1865 

 Figures 30-119, 120a-e 



Syllis arnica Quatrefages, 1865, 11:20, pi. 5, figs. 16-22. 

 Syllis arnica — Fauvel, 1923:258, fig. 95e-n. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-0CS: 



MAFLA 2424A-11/77 (1 spec, USNM 65690), 2851G-7/76 (1 spec). 

 Supplementary Material: 



Florida — Hutchinson Island, St. Lucie County, T. Perkins ID., 9.7 m (HI- 

 775, 1 juv.; HI-776, 1 spec; HI-778, 1 spec. + reproductive stolon), 

 10.0 m (HI-759, 1 spec; HI-760, 1 spec. + reproductive stolon). 

 DESCRIPTION: 



Length, 9.7+ mm (previously reported to 60 mm); width, to 0.9 mm. Body 

 fairly stout; all specimens incomplete with up to 87 setigers. Prosto- 

 mium rounded to trilobed anteriorly, with four lentigerous eyes, with or 

 without two ocular spots (Figure 30-120a). Median antenna with 5-15 

 articles, lateral antennae with 4-10 articles. Palps large, bluntly 

 triangular to rectangular. Dorsal tentacular cirri with 8-16 articles, 

 ventral ones with 6-10 articles. Dorsal cirri with 5-21 articles ante- 

 riorly and 6-11 articles medially. Ventral cirri digitiform to fusi- 

 form, extending beyond parapodia anteriorly. Pygidium with paired cirri 

 having nine articles, plus short, broad, midventral knob-like process. 



30-127 



