13 



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. In front of the oral orifice 

 there are two oblong, oval palp-plates ; its posterior margin is divided by grooves in six digitate 

 lobes. Each parapodium (PI. III, fig. 5) is provided with seven branchial arbuscles, 

 with a short, stout stem, dividing at half its length in two branches, which carry on their tip 

 a tuft of 3 to 6 digitate processes. The median dorsal cirrus is short, conical, not so long as 

 the branchiae ; the lateral one, situated in the interval between the second and third branchiae, 

 is more slender, especially in its terminal portion and projects a little beyond the branchiae. 

 In front of the branchiae a doublé row of bifid bristles projects ; the posterior of these are 

 the longest (PI. III, fig. 6«), stretching a good deal beyond the branchiae, and have a short 

 limb, that measures about a fourth of the long one. The bristles of the anterior series (PI. III, 

 fig. 6ff) are not much longer than the branchiae and have a blunt, short limb, measuring only 

 a fifth of the long one. In the median portion of this dorsal row some rlngent bristles of the 

 type of E. borcalis (PI. VI, fig. 5) are present; their longest limb is about twice as long as 

 the short one and only grooved in its inferior half. 



The neuropodium possesses rounded lips and is furnished with a rather long, slender 

 ventral cirrus ; its fascicle shows three kinds of bristles, differring not only in their length, but 

 also in the shape of their bifurcated end. The shortest of them (PI. III, fig. ja), of about the 

 same length as the ventral cirrus, have a short limb like a spur, whereas the longer one is 

 nearly straight, conical ; the second kind of bristles (PI. III, fig. fff) are about twice as long 

 as the preceding ones, with the longest limb faintly bent, serrated at the tip, and the short 

 one measuring about a fourth of the long limb; the bristles of the third kind (PI. III, fig. je) 

 have about doublé the length of the preceding ones, but are more slender and terminate in 

 a fork, the longest limb of which is faintly serrated and nearly six times as long as the short one. 



The anal cirri are two small, oval appendages. 



9. Euphrosyne sibogae Horst. PI. III, fig. 1 ; PI. IV, figs. 1, 2, 30, 3^, y,- PI. VI, fig. 6. 



Horst, loc. cit. p. 216. 



Stat. 40. Paternoster-islands. 50 specimens. 



A small pelagic Annelid, measuring at the most 10 mm. in length, and 3 mm. in breadth 

 (the bristles not included) ; each segment with seven to e i g h t pairs of highly branched gills, 

 the terminal processes of which are elliptically expanded at the tip. The lateral dorsal cirrus, 

 situated between the second and third branchiae, longer than these ; the median one somewhat 

 shorter. The dorsal row of bristles in front of the five median branchial arbuscles ; ringent 

 setae of the type of E. foliosa. Ventral bristles partly slender and elongated. Caruncle narrow, 

 extending till segment VI. 



In the vicinity of the Paternoster-islands, numerous specimens of a pelagic Euphrosyne 

 were collected with the townet. They could not be identified with one of the known species. 

 The largest of them have a length of about 10 mm., and a breadth of 3 mm. (the bristles not 



