spec), 2104A-5/75 (1 spec), 2104D-5/75 (1 spec), 2210D-7/7t» (1 

 spec), 2422D-7/76 (2 spec), 2422E-7/76 (5 spec), 2423G-7/76 (1 

 spec), 2423E-2/73 (1 spec), 2641-6/75 (1 spec, USNM 55810); CTGLF 02- 

 1/79 (1 spec), 03-5/78 (1 spec); STOCS l/l-l S/76 (1 spec, USNM 

 75210), 4/1-1 S/76 (2 spec, USNM 75211); IXTOC N38-12/79 (1 spec, USNM 

 75127), S52-11/79 (1 spec, USNM 75128), S53-11/79 (1 spec, USNM 

 75129). 



Supplementary Material: 



North Carolina — Cape Hatteras area, Apr. 1965, J. H. Day coll., G. 

 Gaston ID. (2 spec, USNM 51010). 



Gulf of Mexico — Tampa Bay, 1963, J. L. Taylor coll. /ID. (9 spec, USNM 

 45531); Mobile Bay, Mobil Oil Sta. 055B-7/78, 30°15'13"N, 88°03'08"W, 

 4.0 m, coarse sand (2 spec); off Alabama, C0E Sta. 582-4, 30°12.68'N, 

 88°11.2'W, Apr. 1981, 11.3 m, silty sand (1 spec). 

 DESCRIPTION: 



Length, to 15.3 mm (previously reported to 18 mm); width, to 1.4 mm 

 (previously reported to 2 mm). Complete specimens with up to 58 seti- 

 gers. Prostomium pentagonal to quadrangular, with two pairs of contig- 

 uous, lentigerous eyes (Figure 28-26a). Lateral antennae digitiform; 

 median antenna smaller, clavate; all antennae arising on anterior margin 

 of prostoraium. Palps similar in length to lateral antennae. Nuchal 

 organs as slender ridges along postectal margins of prostomium. Dorsal 

 tentacular cirri long, indistinctly articled distally; ventral ten- 

 tacular cirri shorter than body width, also indistinctly articled dis- 

 tally. Parapodia subbiramous anteriorly, becoming biramous with small 

 notopodia (Figure 28-26b) starting on setiger 5. Neuropodia elongate 

 with conical pre- and postsetal lobes. Dorsal cirri shorter than body 

 width, cirriform or indistinctly articled. Ventral cirri short, ta- 

 pered. Notosetae including 1-2 acicular spines (Figure 28-26c), and 2-5 

 furcate setae with long tine minutely bifid distally (Figure 28-26d). 

 Neuropodial falcigers with long extension of shaft-head bifid; blades 

 minutely serrate, with hooked tip and subapical sheath-like spine (Fig- 

 ure 28-26e), blade-length ratio 3.8-10.5:1. Pygidium with two long, 

 smooth or indistinctly articled cirri. Pharynx extending to setigers 3- 

 11, margin surrounded by ten digitiform papillae. 



REMARKS: Some Gulf of Mexico BLM-OCS specimens were previously referred 

 to G. vi ttata . 



PREVIOUSLY REPORTED HABITAT: Intertidal to 15 m; sand mixed with gravel 

 and shell particles; in burrows of the polychaete Glycera robusta and 

 the holothurian Leptosynapta tenuis . 



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

 (Figure 28-25); 10-189 ra; sands, silts and clays. 



DISTRIBUTION: Washington, California, Central America, Virginia to 

 Florida, Gulf of Mexico. 



Gyptis vittata Webster and Benedict, 1887 

 Figures 28-27, 28a-g 



Gyptis vittata Webster and Benedict, 1887:715, pi. 1, figs. 21, 22, pi. 



2, fig. 23. 



Gyptis vittata — Pettibone, 1963:106, fig. 28c, d. 



Gyptis vittata — Gardiner, 1976:119, fig. 8 1-p. 



28-29 



