globularly dilated at a short distance beneath the tip; I think it not improbable, that this 

 afterwards may prove to be a sexual character, because both specimens contained mature ova. 

 The lateral dorsal cirrus is situated between the second and third branchiae and is a trifle 

 longer than these; the median cirrus is about as long as the corresponding branchia. In front 

 of the region between the 2 d and 4 th gills a doublé series of forked bristles arises, the longest 

 of which project somevvhat beyond their tips, whereas the shortest ones only reach about half 

 the length of the °ills; the first named ones have their loncf limb somewhat bent backward 

 and it measures 2 1 /, times the lenoth of the short one. There are numerous rinoent chaetae 

 of the type of E. fo/iosa, situated in a group in front of the interval between the first and 

 second branchia (PI. VI, fig. i i). The neuropodial fascicle consists of bifid bristles of different 

 length, but not projecting beyond the gills ; their longest limb is faintly curved forward and 

 measures five times the length of the short one. The ventral cirrus is slender, but does not reach 

 the extremity of the corresponding setae. 



3. Euphrosyne affinis Horst. PI. II, figs. 1 — 6; PI. VI, fig. 2. 

 Horst, loc. cit. p. 219. 



? Stat. 37. Sailus ketjil, Paternoster-islands. 1 badly preserved specimen. 

 Stat. 40. Anchorage off" Pulu Kawassang, Paternoster-islands. 5 specimens. 



A small, pelagic worm, measuring 8 1 /., mm. in length and 2 x / 3 mm. in breadth (the 

 bristles not included), with six sparingly branched gills, the filaments of which are somewhat 

 tapering towards the tip. Lateral dorsal cirrus between the second and third branchiae, as long 

 as these. In front of the branchiae a doublé row of forked bristles; ringent bristles, of the type 

 of E. fo/iosa, crowded in a median group, corresponding to the interval between the dorsal 

 cirri. Ventral bristles partly elongated and slender. Caruncle extending over four segments; its 

 median keel reaching the anterior part of segment V. 



Besides the preceding species, five individuals of an other pelagic Euphrosyne were found 

 among the swarm of E. sièogae, collected near the Paternoster-islands. They are characterized by 

 a slender body, tapering at its anterior and posterior extremities. The length of the largest 

 specimen is 8 : / 3 mm., its breadth 2 ] / 2 mm. (without the bristles). The bare medio-dorsal field is 

 rather broad, almost a third of the total breadth. The 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. The palp-plates are oblong, pyriform. 



Each parapodium (PI. II, fig. 1) carries a series of six branchial arbuscles; 

 some of them consist of a single, rather stout stem, dividing at its upper extremity in five 

 or six terminal filaments, while others have the main stem dichotomously divided in branches, 

 which carry the terminal filaments. These filaments are not expanded at the tip, but rather 

 somewhat tapering. The lateral dorsal cirrus is situated between the second and third branchiae 



7 



