4 o 



adth being m mm., whereas the number of segments amounts to 53. The bodj 

 lias .1 quadrangular :ction, tapering only a little towards the anterior and th< posterior 



I, tli.it both are rounded; it is colourless, only the branchiae appear as a row of black spots 

 . h side of the dorsum. The skin is wrinkled, showing polygonal areas; moreover there 

 runs a transverse groove over the dorsum ol each segment, separating from its anterioi. half a 

 narrow elliptical field, that lias the appearana ol an intercalated segment, like in Notopyg 



The prostomium (PI. X. fig. 171 has its anterior border nearly straight, whereas its 



iterior margin is rather deeply emarginated; it bears four indistinct eyes, differing not much 

 in sixr. In front "f it the anterior pair of antennae arise, that are rather long; the posterior 

 pair. situated laterally from the anterior corner of the ccphalic lobe, are smaller. The unpaired 

 antenna, arising from the cephalic notch, is very tapering towards its distal end and does not 

 reach half the length of the caruncle. The latter organ is narrow, ridge-shaped and does not 

 \on.l the posterior border of the buccal segment. The mouth is Iimited anteriorly by 

 a vaulted palpar area with a longitudinal groove in the middle, posteriorly by the 4 lh segment. 

 The palpar area as well as the frontal side of the prostomium are covered with small black dots. 

 The parapodia are faintly developed, separated from each other by a great distance, 

 that measnres about half the breadth of the body; the neuropodial bristle-fascicles are much 

 longer than the notopodial ones. In the anterior segments the neuropodial fascicle besides some 

 hastate spines contains in its upper half some slender bifurcated bristles (PI. X, fig. 19), consisting 

 of a short limb and a much longer one, that appears to bc faintly serrated; its inferior half 

 has only simple bristles. about half as long as the preceding, faintly curved, with some denticles 

 u the tip (PI. X, hg. 18). In the segments that are situated more posteriorly, only the 

 last kind of bristles is represented (PI. X. fig, 20), but they are stronger, with a slightly curved 

 tip, remembering those of Pherecardia\ the distal part of these setae has a yellowish hue. Such 

 bifurcated brisdes, as mentioned by Pons in A. maldivensis (PI. XLVI, figs. 15 and 16), could 

 not be observed. The notopodial fascicle contains simple, capillary bristles, glossy as silk. they 

 are serrated, but the denticles could only be detected with high powers. The branchiae commence 

 on the inent: they consist of a compact fascicle of dark brown filaments, that are hardly 



branched and situated behind the bristle-fascicle, not in front of it, as observed by Gkayii r 

 and Pons in the species they examined. The dorsal cirrus is about as long as the branchial 

 filaments (in contracted state); however the ventral one hardly extends to half the length of 

 the neuropodial bristle-fascicle. The anal lissure lies dorsally, Iimited by the four posterior 

 segments; there is an unpaired anal cirrus. This species is closely allied to A. maldivensis Potts 

 and A. djiboutensis Perr.; they belong to a group of Amphinomidae, ranged by i>i Quatrefages 

 in the genus Luioplicrus, characterized by a squat form, by a small caruncle not extending 

 beyond the buccal segment, and by slightly branched gills. 



2. Amphinome pulchra n. sp. PI. X, figs. 21 — 23. 



Stat. 230. 3° 58' Lat. S., i28°2o' Long. E. Banda-sea. Among floating Sargassum. 1 specimen. 



.\ nice small Amphinomid, somewhat resembling a nudibranchiate mollusc; its body 



4° 



