64 ZOOLOGISCHE MEDEDEELTNGEN — DEEL IL 



Halogenia conchifera n. sp. 



Siboga-expedition, Stat. 260, "west off Great Kei-island; depth 



of 90 M. 



At the above-named station a small worm was caught, measur- 

 ing 9 mm. in length, and consisting of 27 segments. Its body 

 is oblong ellipsoidal, flat; the ventral side is rough, beset with 

 globular papillae, whereas the dorsum is covered with sand- 

 grains and shells of Mollusca and Foraminifera, adhering to the 

 scales and the bristles of the cirriphore-segments. The elytra are 

 thin, translucent; presumably there are 13 pairs of them, but 

 their number can hardly be stated without doing too much 

 damage to the unique specimen. The parapodia are long and 

 slender, measuring about two thirds of the breadth of the body. 

 The dorsal cirri are enormously long, with clavate tip, but without 

 distinct terminal joint; the ventral cirri are slender, conical, not 

 extending beyond the extremity of the foot. Instead of the glo- 

 chideal setae there is a fascicle of slender, yellow bristles, not 

 very long, terminating in a large, brown-coloured, curved 

 hook (fig. 2) ; their shaft is longitudinally striated and the hook 

 is somewhat enlarged in the middle. The ventral bristles are 

 slender, provided with 4 teeth, that decrease in size distally. 

 The head is oval, nearly as broad as long, with two short eye- 

 " peduncles, with pigment spots. Between them the tentacle arises 

 Fig. 2. w ith a stout, cylindrical, basal part; its distal joint is long and 



slender, four to five times longer than the head, with a clavate tip. The 



palps are rather long, smooth, tapering distally. 



Leiden, March 1916. 



