PROC. BIOL. SOC. WASH. 95(4), 1982, pp. 807-825 DESCRIPTION OF MOOREONUPHIS JON ESI, A NEW SPECIES OF ONUPHID POLYCHAETE FROM SHALLOW WATER IN BERMUDA, WITH COMMENTS ON VARIABILITY AND POPULATION ECOLOGY Kristian Fauchald Abstract. — Mooreonuphis jonesi, new species (Polychaeta: Onuphidae) is de-scribed from shallow water sandy bays on Bermuda. The variability of morpho-logical features is discussed. Larvae and juveniles are described and selected features of the population ecology of the species are discussed. The total length and numbers of setigers of any specimen are shown to be correlated with mea-surements obtainable on any incomplete specimen. This makes it possible to calculate the total number of segments and the total length for all specimens of a collection and thus, size-frequency distributions can be based on all specimens sampled, rather than just on complete ones. Shallow-water polychaetes from Bermuda have been reported by a series of authors, including Webster (1884) and Verrill (1900). The fauna is reviewed in detail by Jones and Gardiner (in press). Early authors did not report any members of the family Onuphidae from shallow water. In contrast, Hartman (1965), and Hartman and Fauchald (1971) reported six species from slope and abyssal depths off Bermuda; most of these species are limited to deep water areas. The material studied by Jones and Gardiner (in press) is the same as that reported upon here. The generic definitions and terminology are as defined in Fauchald (1982). All calculations follow the procedures outlined in Sokal and Rohlf (1969). Most of the material is deposited in the collections of the National Museum of Natural History, Smithsonian Institution (USNM), and paratypes have been de-posited in the Allan Hancock Foundation, University of Southern California (AHF), The Australian Museum, Sydney (AMS), British Museum (Natural His-tory), London (BMNH), Zoologisches Museum und Staatsinstitut, Hamburg (ZMH), and Zoological Institute, Academy of Sciences, Leningrad (ZIL). Mooreonuphis jonesi, new species Figures 1-8, Tables 1-4 Material examined. — Bailey's Bay, inner bay near Fractious Street, inshore, 1.2 m depth, sand, 29 Aug 1981, coll. M. L. Jones (10 paratypes, USNM 72789); Boaz Island, outer side of SW end of Grey's Bridge, bare sand and sand overlain with thick algal mat, 1.2 m depth, 6 Sept 1981, coll. M. L. Jones (13 paratypes, USNM 72790); Boaz Island, outer side of SW end of Grey's Bridge, Thalassia-substrate, 1 m depth, 6 Sept 1981, coll. M. L. Jones (2 paratypes, USNM 72791); Southeastern base of Causeway (Blue Hole side), sand, 14 Aug 1975, coll. M. L. Jones (10 paratypes, USNM 72792; 2 paratypes, BMNH ZB 1982:43-44; 2 para-types, AHF Poly 1373; 2 paratypes, AMS W 19107); Southeastern base of Cause-
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