PROC. BIOL. SOC. WASH. 94(4), 1981, pp. 968-983 FIVE NEW POLYCHAETES OF THE FAMILIES EUNICIDAE AND ONUPHIDAE, COLLECTED IN 1975 AND 1976 DURING THE SOUTHERN CALIFORNIA BASELINE PROJECT John F. Shisko Abstract. — Eunice caeca, E. multicylindri, Nothria exigua, Onuphis mul-tiannulata, and O. segmentispadex are described from the Southern Cali-fornia Bight. Introduction In a basehne study of the Southern CaHfomia Bight, funded by the Bureau of Land Management in 1975, 777 stations were sampled between Septem-ber 1975 and April 1976. The benthic samples used in the present study, listed in Appendix 1 , were taken aboard the R/V Velero with a box coring device Vi6 m^. The samples were then sequentially washed through sieves with 1.0 mm and 0.5 mm meshes respectively, saturated with magnesium chloride in sea water for 30 minutes to relax the specimens, fixed in 10% formaldehyde, and stored in 70% ethanol. Eunice caeca, new species Fig. 1, Table 1 Material.— 24774 (1, type). Description. — The type is complete with 90 setigers. The pygidium is in the process of regeneration. The specimen is 110 mm long and 6 mm wide including the parapodia. A color pattern is lacking. The ventrum is deeply concave from setiger 4-6. The prostomium is as long as wide with a fairly deep median cleft. Eye-spots are absent; however, a patch of pigment is located posterior to the bases of the outer lateral occipital antennae. The occipital antennae are composed of cyHndrical articles of irregular length. The outer lateral ones have 4 to 5 articles and barely reach setiger 1 . The inner lateral antenna is incomplete. Irregular wrinkles on the tentacles add to the difficulty in count-ing articles. The first peristomial segment is longer than the prostomium and is 3 times as long as the second peristomial segment. The second peristomial segment bears the peristomial cirri. The peristomial cirri are wrinkled, equal the dorsal cirri of setiger 5 in both length and shape, and reach to the bases of the outer lateral occipital tentacles.