NEW EUPIIROSYNE-SPECIES. 217 



ventral side of the caruncle are also exceedingly developed. 

 Each parapodium carries seven to eight very ramose 

 branchial arbuscles, whose branches are elliptically dilated 

 at the tips; the latter contain some cells highly refracting 

 the light, probably of a glandular nature, which secrete 

 mucus. The lateral dorsal cirrus, placed between the second 

 and third branchiae, is slender and projects a great deal 

 beyond the tips of the gills, whereas the median one is 

 much shorter. There is a single series of bifid bristles in 

 front of the five median branchiae, somewhat longer than 

 these ; among them are some ringent bristles of the type 

 of E. foliosa. The neuropodium has a rounded anterior lip 

 and contains a fascicle of forked bristles, some of which 

 are very slender and elongated ; their longest limb is nearly 

 straight, faintly serrated and about six times as long as 

 the short one. 



Euphrosyne pelagica, n. sp. 



Station 40, Paternoster-islands. 



Among the numerous specimens of E. sibogae I met with 

 some individuals of an other small species, already recog- 

 nizable to the naked eye by their dark, brownish, trans- 

 verse series of gills. The largest specimen measures about 

 8 mm. in length, its breadth being 2^/3 mm. (the bristles 

 not included). The breadth of the bare dorso-median field 

 is about one fourth of that of the body. The number of the 

 segments amounts to 30. The caruncle extends over four 

 segments; it has an elevated median keel, stretching some- 

 what beyond the lateral lobes. There are large, oval eyes 

 at the dorsal as well as at the ventral side of the caruncle ; 

 in front of the former the unpaired tentacle is inserted, 

 with a short, conical terminal joint, stretching not far beyond 

 the eyes. Each parapodium carries a series of seven short 

 and stout branchial arbuscles, dividing in two branches, 

 which carry on their tip a tuft of 3 to 6 digitate processes. 

 The lateral dorsal cirrus, situated between the second and 



Notes from thie Leyden ZMuseum, "Vol. XXIII. 



