60 U.S. NATIONAL MUSEUM BULLETIN 227 



burrows (Verrill, 1885b). Also found on floating cuttlebone in 

 company with Lepas and small gastropods, on fronds of algae, as the 

 gulfweed Sargassum. Thus should be considered a tropical form that 

 becomes a Gulf Stream pelagic waif. Occasionally dredged. Females 

 show brood care, the young attached to the adult. Worm 90 mm. 

 long found with 20 young on its body, ranging in length from 3 to 10 

 mm. (Augener, 1922). On a specimen (in the U.S. National Museum) 

 from off the Philippine Islands found on driftwood, young specimens 

 were wrapped around the parapodia near the branchiae — large enough 

 to resemble the adult. Young immature specimens have been found 

 on floating objects. 



Material examined.— North Atlantic (Nantucket Sound, off 

 Falmouth Heights, Massachusetts, 5 fathoms, June 18, 1950, J. 

 Rankin; Vineyard Sound near Lucas shoal, among Lepas on log, 

 September 4, 1959, M. Gray; Albatross Station 2566, 37°23' N., 

 68°08' W., surface, in wood, August 29, 18S5 ; Albatross Station 1655, 

 Gulf Stream, surface). 



Distribution. — Cosmopolitan and widespread in tropical zones of 

 the Indian, Pacific, and Atlantic Oceans. Carried by floatiag objects 

 to North Atlantic (Gulf of Mexico, Florida, Bermuda, North Carolina, 

 Massachusetts), South Atlantic (South Africa), North Pacific (China 

 Sea, Japan), Indian Ocean (Ceylon). Intertidal to 112 fathoms; 

 surface. 



Genus Pareurythoe Gustafson, 1930 



Type (designated by Hartman, 1959a): Pareurythoe japonica 

 Gustafson, 1930. Contains only one New England species. 



Pareurythoe borealis (Sars, 1862) 



Figure 13c 



Eurythoe borealis Fauvel, 1923, p. 129, fig. 46,/i-n. 

 Pareurythoe borealis Okuda, 1938, p. 78, figs. 1-2. 



Description. — Length up to 44 mm., width up to 3 mm., segments 

 23-77. Prostomium with convex quadrate area with median antenna 

 and four eyes arranged in rectangle, the anterior pair larger; with 

 semilunar buccal cushion anteriorly, bearing paired lateral antennae 

 anterior to the eyes and paired palps laterally; the 5 prostomial 

 appendages short, subulate, subequal. Prostomial caruncle extending 

 from posterior part of prostomium on first 3 setigers, a simple, smooth^ 

 linear, smooth crest (fig. 13c). Ventral mouth surrounded by pro- 

 stomial cushion and first 3 setigers. Anus terminal, \vdth median oval 

 lobe. Paired branchiae with few digitiform filaments (3-5), beginning 

 on setiger 2 and continuing posteriorly. Dorsal and ventral cirri 

 jointed basaUy. Notosetae capillary, harpoonlike, and bifurcated. 



