's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 17 



? Scalisetosus ceramensis Mc Intosli l ). 



Siboga-expedition, Stat. 267, east off Great Kei-island. 



At the above-named Station, in a depth of 984 M., a worm was 

 dredged, that with regard to its bristles much agrees with Scalis. cera- 

 mensis; unfortunately Mc Intosh only had a single badly preserved spe- 

 cimen at his disposal, and our specimen also lacks the elytra and the 

 cirri. The neuropodial lobe has its anterior lip very much elongated, with a 

 filiform tip, extending beyond the point of the acicula, that lies enclosed 

 in its base; its long and slender bristles have the distal end dilated, 

 slightly falciform, obviously serrulated along both edges, with a small 

 tooth beneath the tip, but not separated from the shaft by a semilunar 

 cusp as in other species. The dorsal lobe is also pointed and elongated, 

 but hardly reaches to half the length of the ventral one; its bristles are 

 stout, half as long as the ventral ones, slightly curved and furnished 

 with three spines in stead of the usual fringes. 



Scalisetosus (Polynoë) crinoidicola Potts 2 ). 



Siboga-expedition, Stat. 164, south off Salawatti. 



At the above-named Station a small worm was caught, that most agrees 

 with Potts' description of Polynoë crinoidicola, found on crinoids from 

 the Maldives. Its dorsum is brownish black, somewhat paler in the 

 median line, with two narrow white, tranverse lines over each segment; 

 the parapodia and the ventral side of the body are yellowish buff. The 

 eyes are surrounded by a pale ring ; the anterior pair of them are the 

 largest, strongly protuberant. Of the fifteen pairs of elytra only a single 

 one was left; it is circular, except a small notch near the eccentrical 

 scar of attachment, from which several nerve-trunks are ramifying towards 

 the circumference. The surface of the elytra is smooth, its border without 

 fringes; at the inferior side it was partly covered with a layer of pig- 

 ment cells of the same colour as the dorsum. The parapodia are charac- 

 terized by the elongated, conical shape of the neuropodium; the notopo- 

 dium is much shorter, rudimentary, only its acicula is surrounded by a 

 short cylindrical process. 



Scalisetosus papilliferus n. sp. 



Siboga-expedition, Stat. 43, anchorage of Poeloe Sarassa, Postilion- 

 islands; Stat. 99, anchorage of North-Oebian ; Stat. 172, off Gisser. 



This species is characterized by the feature of its elytra; they are 



1) Challenger Annelida Polychaetae, p. 103, PL X A, figs. 13 and 14. 



2) Loc. cit. p. 337, PI. XVIII, fig. 10, PI. XX, fig. 30,' PI. XXI, figs. 39—41. 



(17— VII— 1915) 



