PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASfflNGTON 109(3):430-445. 1996. Protoglossus graveolens, a new hemichordate (Hemichordata: Enteropneusta: Harrimanidae) from the northwest Atlantic Cem Giray and Gary M. King Darling Marine Center, 25 Clark's Cove Road, Walpole, Maine 04573, U.S.A. Abstract.— A new hemichordate species, Protoglossus graveolens, is de-scribed from Maine, U.S.A. Protoglossus graveolens is the second member of its genus and the only North American protoglossid. Protoglossus graveolens occurs intertidally, usually with another enteropneust, Saccoglossus bromo-phenolosus King et al., 1994. The new species is assigned to the genus Pro-toglossus based on the following criteria: 1) proboscis musculature; 2) probos-cis coelom; 3) proboscis septa; 4) a basal sheath at the posterior end of the proboscis stalk; 5) inclination of the collar; 6) perihaemal spaces in the collar; 7) lack of esophageal pores. Protoglossus graveolens is differentiated from Protoglossus koehleri (Caullery & Mesnil, 1900) on the basis of size, colora-tion, proboscis and branchial skeleton morphologies, collar dimensions and internal organization of the collar. Three harrimaniid species have been re-ported from coastal Maine. Two of these were considered a single species but have recently been differentiated into Saccog-lossus bromophenolosus King et al., 1994 and S. kowalevskii Agassiz, 1873. Saccog-lossus bromophenolosus occurs in colder waters, ranging from southern Maine northward at least to Nova Scotia (Prefon-taine Sc Brunei 1962, Bromley 1979, King et al. 1994); populations are also known from Oregon and Washington (Bullock 1975, Kozloff 1987). In contrast, S. ko-walevskii occurs from Georgia to southern Maine (Colwin & Colwin 1953, 1962; El-der 1973, Jaffe 1983, Fox & Ruppert 1985, Woodin et al. 1987, King et al. 1994). The third species reported from Maine, Ster-eobalanus canadensis (Spengel, 1893) oc-curs subtidally, and has been reported from Nova Scotia (Spengel 1893, 1901), Frenchman's Bay, Maine (Reinhard 1942), the Gulf of St. Lawrence (Prefontaine & Brunei 1962), the west coast of Scotland (Burdon-Jones & Mclntyre 1960), San Di-ego, California (Bullock & Rao unpubl. observations cited in Burdon-Jones & Mclntyre 1960) and the Norwegian Sea (Romero-Wetzel 1989). We describe here a fourth and new harrimanid from three ad-jacent sites in the Damariscotta River es-tuary, Maine, U.S.A. (43'^56'N, 69°34'W). The new species is presumptively as-signed to the genus Protoglossus (van der Horst, 1927). This genus is referred to by different names throughout the literature. Placement of the first protoglossid species, P. koehleri, was uncertain with proposals for the genus Balanoglossus Delle Chiaje, 1829 and a new genus Balanocephalus (Harmer, 1899) (Caullery & Mesnil 1900). The latter genus was renamed Protobalan-us (Caullery & Mesnil, 1904) and placed in a new family, Protobalanidae (Caullery & Mesnil 1904). Protobalanus was re-na-med Protoglossus (van der Horst, 1927) and subsequently placed in the family Har-rimaniidae (Burdon-Jones 1956). Although Benito (1982) places Protoglossus in a separate family, Protoglossidae, the char-acter overlap between Saccoglossus Shi-mkewitsch, 1892 and Protoglossus (Table
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