10 ZOOLOGISCHE MEDEDEELTNGEN — DEEL I. 



verse white band occurs on the middle of each segment, preceded and 

 succeeded by a white dotted line. The head, more broad as long, shows 

 on each side two large eyes, situated laterally ; its posterior margin lies 

 hidden under a large semilunar nuchal collar. There are 15 to 17 pairs 

 of elytra, not overlapping each other in the median dorsal line; each 

 elytron is translucent, rounded quadrangular, with its scar of attachment 

 somewhat eccentrical and the exterior area of its surface covered with 

 small three-spined papillae. In the parapodia both lobes are provided 

 with a filiform prolongation, enclosing the acicula; the ventral bristles 

 are slender, with the distal part lanceolate, faintly serrated, the superior 

 ones indistinctly bifid, the inferior with a distinct spur beneath the tip. 



Halosydna Kinberg '). 



Elongated body with 18 — 21 pairs of elytra, situated on segment 2, 

 4, 5, 7, 9 23, 25, 27, 29, 31 33 and 35; notopodial fascicle rudi- 

 mentary. 



Halosydna fulvovittata (Grube) 2 ). 



(Polynoë platycirrus Mc Intosh) 3 ). 



Siboga-expedition, Stat. 51, Madoera-bay, Molo-strait; Stat. 164, South 

 off Salawatti; Stat. 273, anchorage off Poeloe Jedan, east-coast of Aroe-islands. 



This species strikes the eye by the striped appearance of its oblong 

 elytra, that are furnished with 4 or 5 longitudinal dark stripes, that 

 pass in a somewhat oblique direction from the inner to the outer mar- 

 gin; moreover they show in their posterior half, in the vicinity of the 

 scar of attachment, a couple of keels, having the same direction as the 

 above-named stripes. Along the anterior and interior margin of each 

 elytron there occurs a band of small réfringent bodies, also figured by 

 Mc Intosh and Potts, though not mentioned by them ; Marenzeller calls 

 them "sehr niedere Papillen", what however appears not very correct, 

 because they do not extend above the surface of the elytron, but lie 

 embedded in a dish-like cavity of the cuticula. I quite agree with Ma- 

 renzeller in considering Polynoë platycirrus Mc Intosh to be identical 

 with Polynoë fulvovittata Grube. 



Parahalosydna n. g. 



Characterized by the presence of only 15 pairs of elytra, on segment 

 2, 4, 5, 7, 9.... 23, 26, 28 and 30, covering the whole dorsum; noto- 

 podial fascicle rudimentary. 



1) Annulata, p 15. 2) Loc. cit. p. 33, PI. Ill, 



3) Challenger-Annelida, p. Ill, PI. III. fig. ê etc. 



