2b. Parapodia poorly developed, not sharply set off from body (Figure 

 29-2a) Cabira, p. 29-5 



3a. Three antennae present, usually longer than palps (Figure 29-6a); 



integument smooth, areolated or wrinkled, not papillose (Figures 



29-4a, 6a) Sigambra, p. 29-6 



3b. Two or three antennae present, usually shorter than palps (Figure 



29-22a); integument papillose (Figure 29-22a) 



Ancis t rosy 1 lis, p. 29-12 



4a. Notopodia with stout emergent spines 5 



4b. Notopodia without emergent spines (Figure 29-26b) 



Pilargis, p. 29-26 



5a. Tentacular cirri absent Parandalia, p. 29-28 



5b. Tentacular cirri present (Figures 29-30b, 32b) 5 



6a. Palps not fused dorsally (Figure 29-32a); antennae and palpostyles 

 present (Figure 29-32b) Synelmis, p. 29-30 



6b. Palps fused dorsally (Figure 29-40a); antennae and palpostyles 

 minute (Figure 29-40a,c) or absent Litocorsa, p. 29-39 



Genus Cabira Webster, 1879 



TYPE SPECIES: Cabira incerta Webster, 1879. 



REFERENCE: 



Pettibone, 1966:177. 



DIAGNOSIS: Palps not fused; palpostyles small. Lateral antennae small 



if present; median antenna absent. Two pairs of small tentacular cirri 



present. Acicular notosetae hooked. Neurosetae smooth, tapering to 



fine or slightly curved, entire or minutely bifid tips. Parapodia 



poorly developed, not sharply set off from body. Integument smooth to 



papillose. Pygidium bilobed, without anal cirri. 



Cabira incerta Webster, 1879 

 Figures 29-1, 2a-f 



Cabira incerta Webster, 1879:267, pi. 11, figs. 155-157. 

 Cabira incerta — Pettibone, 1966:178, figs, lla-c, 12a-e. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 



SOFLA 14B-8/81 (1 spec, USNM 86936); MAFLA 22071-8/77 (1 spec, USNM 

 86935), 2209H-6/76 (1 spec), 2422D-6/76 (1 spec); STOCS 4/III-3 F/76 

 (3 spec, USNM 86939), HR1-3 F/76 (1 spec, USNM 86940); IXTOC IV-2(?)-2 

 11/79 (1 spec, USNM 86937), S53-6 11/79 (1 spec, USNM 86938). 

 Supplementary Material: 



Virginia — Chesapeake Bay, 37°32'N, 76°07'W, July 1961, 12 m, M. 

 Pettibone ID. (USNM 30985, 2 paraneotypes). 

 DESCRIPTION: 



Length, 13+ mm (previously reported to 13 mm); width, to 0.80 mm (pre- 

 viously reported to 1.5 mm). Largest specimen incomplete with 37 seti- 

 gers. Prostomium (Figure 29-2a) with small, stout lateral antennae; 



29-5 



