III 



these spirally-whorled setae are to be found only iii the segments without elytra. The dorsal 

 part of this fascicle consists of stout bristles with a simple appendix, while their shaft is smooth 

 or only provided with a few ridges at the extremity ; among these there occurs a couple of 

 setae with an eight-jointed appendix. The ventral part of the fascicle consists of a dense tuft 

 of slender brisdes, with a multi-articulate appendix and a smooth shaft, not thicker than the 

 appendix itself; among them there occur one or two stout bristles with a simple appendix. 



In Sig. poiirtalesü as well as in Sig. arenicola the shaft of some of the stout bristles 

 appears to bear many more ridges than in our species. The Siboga-specimens could not be 

 identified with Sig. amboinensis^), for according to Grube this species does not possess any 

 ctenidia ("lobuli ciliati nulii") and the branches of the elytra-papillae appear to be more nume- 

 rous and slender. 



2. Sigalion sp. 



Stat. 133. Anchorage oft" Lirung, Salibabu Island (Talaut isles). Depth up to 36 M. i specimen. 



At the above-named Station an anterior fragment of a species of Sigalion was collected, 

 that differs in some characters from the foregoing species. The number of papillae on the border 

 of the elytra amounts to 19, bearing each 8 to 9 branches. In the neuropodial fascicle all 

 compound bristles have a multi-articulate, cheliform appendix ; there are no setae with simple 

 appendix as in Sig. bandaënsis. 



Genus Sthenclais Kinberg ^). 



Prostomium with a single median antenna (tentacle), usually with ctenidia at its basal 

 joint ; lateral antennae fused with the first parapodia. Parapodial and buccal ctenidia and also 

 stylodes present. No dorsal cirrus on the third segment. Dorsal bristles simple, slender, with 

 spirally arranged, denticulated whorls ; setae of the ventral fascicle compound with a simple or 

 multi-articulate, cheliform appendix, however in its upper part usually some simple bristles, with 

 spinous whorls below the tip. Papillae of the proboscis "/^j. 



I. Sthenelais variabilis Potts. PI. XXII, fig. 6. 



POTTS, loc. cit. p. 349, PI. XIX, figs. 22 and 23; PI. XXI, fig. 63. 



Stat. 51. Molo Strait. Depth 69 — 91 M. i incomplete specimen. 



Stat. 114. 0° 58.5 Lat. N., 122° 55' Long. E. Kwandang Bay entrance. Depth 75 M. i incom- 

 plete specimen. 



Stat. 164. i°42'.5 Lat. S., i30°47'.5 Long. E., Depth 32 M. 2 incomplete specimens. 



Stat. 240. Banda Anchorage. Depth 9 — 45 M. i incomplete specimen. 



Stat. 260. 5°36'.5 Lat. S., 132° 55.2 Long. E. Off Great Kei Island. Depth 90 M. 2 incomplete 

 specimens. 



Taking into account the appearance of the elytra and the composition of the neuro- 



i) Anneliden-Ausbeute von S. M. S. Gazelle, p. 520. 



2) In the synopsis of the species of Sthenelais^ published by Potts, undotibtedly a lapsus calami has crept in; in stead of 

 notopodium ought to be read n e u r o p o d i u m. 



67 



