Proceraea cornuta — Gidholm, 1967:205, figs. 13e,f, 28a. 

 Proceraea cornuta — Day, 1973:35. 



MATERIAL EXAMINED: 

 Gulf of Mexico BLM-OCS: 

 MAFLA 2211J-7/76 (1 spec). 

 DESCRIPTION: 



Length, 2.4 mm (previously reported to 18 mm); width, 0.3 mm (previously 

 reported to 0.7 mm). Body small, slender, with 25 setigers plus seven 

 incompletely developed preanal segments. Prostomiura rectangular. Two 

 pairs of large, lentigerous eyes, each pair contiguous. Median antenna 

 long, wrinkled, broken; lateral antennae missing. Palps short, com- 

 pletely fused. Nuchal epaulettes small, semicircular; extending over 

 tentacular segment only (Figure 30-2a). Dorsal tentacular cirri long, 

 about one-third length of first pair of dorsal cirri. Ventral tentacu- 

 lar cirri about one-half length of dorsal tentacular cirri. Dorsal 

 cirri extremely long on setiger 1, thereafter uniformly short. Anal 

 cirri paired, moderately long, wrinkled. Blades of composite falcigers 

 short, bidentate, with rounded, contiguous teeth, subdistal tooth 

 slightly larger (Figure 30-2b). Superior bayonet-seta (Figure 30-2c) 

 present from setiger 2. 



REMARKS: Since the poorly developed pharynx and proventricle could not 

 be dissected or adequately examined due to the extremely small size of 

 the single specimen, and since the prostomial antennae were either 

 broken or missing, only tentative assignment to species could be made. 

 PREVIOUSLY REPORTED HABITAT: Low water to 140 m; under rocks; on pil- 

 ings; in muddy sand; with sponges, algae, hydroids, barnacles, mussels, 

 tunicates; sexual forms in surface waters. 



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

 (Figure 30-1); 43 m; coarse sand. 



DISTRIBUTION: Arctic, Norway to English Channel, Labrador to North 

 Carolina, ?Gulf of Mexico, Japan. 



Genus Autolytus Grube, 1850 



TYPE SPECIES: Nereis prolifera 0. F. Muller, 1788. 

 REFERENCES: 

 Imajima, 19&6:27. 

 Day, 1967:281. 

 Gidholm, 1967:179. 

 Fauchald, 1977a:81. 



DIAGNOSIS: Prostomium with three antennae; palps fused. Two pairs of 

 tentacular cirri. Nuchal epaulettes present, length variable. Anten- 

 nae, tentacular and dorsal cirri cylindrical; cirrophores present. 

 First pair of dorsal cirri longest. Bayonet-setae with lateral spines, 

 and with shafts much thinner than shafts of composite falcigers. Seg- 

 mental ciliated bands present. Pharynx sinuous, trepan with variable 

 number of teeth. 



30-10 



