170 PROCEEDINGS OF THE XATIOXAL MUSEUM vol.86 



Genus EUPHROSYNE Savigny 



EUPHROSYNE BOREALIS 0rsted 

 FiQUKE 46, a, 6 



Euphrosyna borealis 0bsted, 1842, p. 113. 



Body oval in outline ; length 14 mm, \Yidth 7 mm. The parapodial 

 ridge is thickly set with setae and gills, the tips of the dorsal setae 

 in each somite overlapping those of the opposite side, their bases 

 leaving a median dorsal clear space hardly wider than one-eighth of 

 the body diameter. The caruncle (fig. 46, a) extends onto the fourth 

 setigerous somite and has three longitudmal lobes, the median cov- 

 ering the laterals. At the anterior end of the caruncle lie tlie 

 posterior eyes, overlapped by the basal portion of the median tentacle. 

 This tentacle has a thickened, oval, basal portion that abruptly nar- 

 rows distally into a slender process about one-third as long as the 

 basal. An anterior pair of eyes lies on the ventral face of the 

 prostomium and is not visible from above. In none of my material 

 was I able to demonstrate the anterior paired tentacles that should 

 lie at the level of the anterior eyes. In the other species these were 

 easily seen. (See E. hranchiata below.) The dorsal cirrus is some- 

 times difficult to see since it varies greatly in size. It is slender and, 

 as noted by Mcintosh (1885, p. 6), is fastened to the body wall almost 

 in contact with the base of the dorsalmost gill (fig. 46, h). The 

 ventral cirrus is much larger and lies near the ventral end of the 

 seta row, its base surrounded by the ventralmost setae. In two somites 

 taken at random there were six and seven gills in a single row on 

 the parapodial ridge of one side of the body. Some of these were 

 single filaments, but others may be 2-, 3-, or 4-branched (fig. 46, h). 

 0rsted described them as "bi-tripartitis." In the figure the dorsal 

 cirrus is shown at the base of the gill. 



The ventralmost setae form a prominent tuft in which those nearest 

 the ventral surface are the shortest. Dorsal to the tuft the setae 

 are shorter and continue of uniform width to the end of the ridge. 

 The setae are as figured by Mcintosh (1885, pi. lA, figs. 4-6). 



EUPHROSYNE BRANCHIATA. new species 



FiotTKE 46, c-f 



Description. — Body length 6-7 mm; width 2-3 mm. The body is 

 elongate-oval in outline and somewhat less shaggy in appearance than 

 others of this genus. The ventral setae are longer than the doi-sal 

 and extend to a considerable distance from the body. Dorsal to this 

 tuft of ventral setae the othei*s are much shorter, hardly longer than 

 the gills. The caruncle extends to the fourth somite, and the median 



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