220 NEW EUPHROSYNE-SPECIES. 



number of its segments amounts to 28. The caruncle has an 

 oval shape and is about twice as long as broad ; it extends 

 over four segments, the median keel reaching the fifth one. 

 There are large eyes at the dorsal and ventral side of the 

 caruncle; in front of the former the unpaired tentacle is 

 inserted, with a small conical terminal joint, stretching only 

 a little beyond the eyes. Each parapodium carries six 

 slender gills, faintly branched, their terminal processes 

 tapering towards the tip. The lateral dorsal cirrus is situated 

 between the second and third branchiae and nearly as long 

 as these ; the median one is shorter. Both cirri as well as 

 the gills are characterized by the presence of numerous 

 small bodies, highly refracting the light. In front of the 

 branchiae a double series of forked bristles projects ; among 

 them some ringent bristles, of the type of E. foliosa, are 

 crowded together in a group corresponding to the region 

 between the dorsal cirri. The neuropodium has a rounded 

 triangular anterior lip ; its fascicle contains some slender, 

 elongated bifid bristles, much longer than the gills, with their 

 longest fork faintly serrated near the tip. 



Euphrosyne pilosa, n. sp. 



Among the specimens of E. sibogae, from Station 40, near 

 the Paternoster-islands, I found three individuals of an 

 other pelagic species, recognizable by the high development 

 of its bristles. The body of the largest specimen measures 

 8^/2 mm. in length and 2^/3 mm. in breadth (the bristles 

 not included). The diameter of the bare medio-dorsal field 

 is about one third of the total breadth. The number of its 

 segments amounts to 22. The caruncle is three-lobed and 

 extends with its lateral lobes over three segments, whereas 

 the median keel reaches the fourth one. The unpaired ten- 

 tacle, arising in front of the large dorsal eyes, is very long; 

 with its slender terminal joint it stretches till the posterior 

 end of the median caruncle-lobe. Each parapodium carries 

 a series of six cylindrical gills, which do not show any bran- 

 Notes from tlie Leyden ]Miiseum, Vol. XXIII. 



