IO 



the dorsal ones a short, tliick, unpaired tentacle arises, furnished with 



rminal joint and measuring a fourth of the total length of the caruncle. TIn ventra] 



i smal! antenna. The palp-plates in front of the mouth are two oval lob< . 



the first and second segment; at iis posterior border the mouth is bounded bj 



plate, folded longitudinally and inclosed within the median field ol the third and 



. h p a r a p o d i u m carries a transverse group of e i g h t stout branchial arbuscli > 

 arranged in a single series, but some of them in front of the other on< 

 their short stem divides in numerous cylindrical processes, which are not dilated at the tip. The 

 lateral dorsal cirrus, situated opposite to tlic third gill, lias about the same length as this-. the 

 median cirrus is somewhat shorter. In front of the branchiae a doublé series of forked bristles 

 projects, the longesl of which extend somewhat beyond their tips, whereas the shortesl om 

 only reach half the length of the gills; the forks of those bristles are vitreous, impregnated 

 with calcium carbonate, and, in the longest of them (PI. III. fig. 3), the length of the short 

 limb measures about a fifth of the long one. There are numerous ringent chaetae of the type 

 of /:". foliosa (PI. VI, fig. 4». The neuropodium lias an ear-shaped anterior li]> and contains 

 a fascicle of bifid bristles (PI. III. fig. 4. <?, b, c) of different length, but not stretching far 

 beyond the gills; their longest limb is faintly curved, about four times as long as the short one. 



The anal cirri are two short, oval plates. 



Though already several /:'.v/>//,'v.q7/c'-species [E. aurantiaca, /:'. borealis^ E. superba and 

 /:". ceylonicd) are described with eight pairs of branchiae on each segment, the filaments of 

 which are not expanded at the tip, the Siboga-specimen however could not be identified with 

 one of these. In the three first-named species the lateral dorsal cirrus is situated betwecn the 

 third and fourth branchiae; moreover the ringent chaetae of /:. borcalis and /;'. superba have 

 an other shape, their longest limb being only faintly curved and the short one hardly enlargcd. 

 /:'. ceylonica also is distinguished by ringent chaetae of an other feature and by the manner 

 of their being gathered in a median group. 



6. Eitphrosyne superba Marenz. 



E. VON MARENZELLER, Südjapanischc Annelidcn, Dcnkschr. Math.-Xaturw. Cl. K. Akad. 

 Wisscnsch. Wien. Bd. XI. I. 1879. p. 2. Tl. I, figs. 1 and 1 .1. 



Stat. 12. ~ 15 Lat. S., 1 15° 15.6 Long. E. Bali Sca. Dcpth 289 M.; mud. 1 specimen. 



Au Annelid of squat shape, with on each segment sevcn to eight pairs of branchiae, 

 that are divided in numerous filaments, not dilated al the tip. The lateral dorsal cirrus situated 

 between the third and fourth branchiae. The transverse row of dorsal bristles in front of the 

 six median gills ; ringent chaetae of the type of/:', borcalis. Caruncle extending to segment VI. 



Though the Siboga-specimen is much smaller than the specimen, described by v< in 



Marenzeller, it agrees nearly in all other regards with his description, so I think it to be 



ntical with this species. The length of its body is about 34 mm., whereas the specimen of 



