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Upper pair of longer spines about as long as lower pair. Behind the upper pair, there is a 

 distinct notch, which in one specimen is smaller than in the other. The inferior pair cannot 

 be said to be placed on a special projection — yet it is situated somewhat above the 

 level of the other spines, and a small notch, in some specimens, also separates these two 

 spines from the middle ones. Betvveen the upper and inferior pairs 5 to 6, spines are 

 disposed along the edge. These are much shorter and thinner than those of the upper and 

 inferior pairs. 



Ou ter maxillae (PI. XVII, fig. 12) with the outer lobe rather broad, certainly not 

 much longer than it is broad, the extremity towards the interior side bluntly pointed. Hairs 

 cover densely a large part of the inner surface towards the extremity and along the distal 

 margin. A longitudinal group of hairs can be seen to extend over the middle of the said 

 surface to the inner lobe. The latter bears several rows of hairs, of which those disposed along 

 the inner margin are, as usual, directed towards the basis of the maxilla. 



Cirri. First pair has unequal rami of 9 and 15 — 17 segments. The 7 — 8 lower 

 segments of the longer ramus form a broader basal part, the 8 to 9 remaining segments are of 

 a more elongate shape. The 3 rd to 7 th middle segments of the shorter ramus have the inner 

 face distinctly protuberant, and dense tufts of hairs are disposed on these protuberances. 



Second pair has 9 to 10, and 10 to 12 segments in the two rami, the lowest segment 

 of each ramus being indistinctly composed of three segments. The segments are very protuberant 

 on their inner faces, and the hairs disposed on these protuberances are long and form very 

 dense tufts. 



Third pair has the rami slightly more unequal of 11 (12) and 13 — 15 segments. The 

 segments have the inner or anterior face rounded, but not distinctly protuberant; the tufts of 

 hairs disposed on the anterior face less dense than on the 2 nd cirrus. No teeth are observable 

 on the surface of the rounded anterior face. 



Fourth pair: number of segments 26 to 27. Three pairs of spines along inner face 

 of middle segments. 



Sixth pair: number of segments 27 to 29 — in several specimens, however, the cirri 

 of the last pairs are broken off. The middle segments (PI. XVII, fig. 13) are slightly longer 

 than broad, with the inner face somewhat rounded and bearing four pairs of spines, the third 

 of which is considerably shorter than the i st (the most distal one) and the 2 nd , the fourth (the 

 basal one) being quite rudimentary. The hairs disposed on the dorsal face, close to the upper 

 margin of each segment, form a group of two or three, one of which is longer and somewhat 

 thicker than the others. 



Penis has several hairs scattered over distal part, and a rather dense tuft at the 

 extremity; near its basis the dorsal side bears a short blunt tooth. 



This species was taken by the Siboga at two Stations, which are not very distant from 

 one another: 



Stat. 49 1 . April 14, 1S99. Lat. 8° 23'. 5 S., Long. 1 19 4'. 6 E. Depth 69 m. Sapeh-strait. Bottom : 

 coral and shells. Numerous specimens, attached to pieces of wood that are 

 much perforated by Teredo. 



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