204 



of spines, then 4 spines, and on the maxilla of the other side 5 somewhat shorter spines, then 

 two longer ones of the same size as those of the upper pair. The base of the middle-spines 

 slightly overlap each other, tliese spines giving, in consequence, the impression of standing 

 in two rows. The superior and inferior margins nearly parallel to each other. 



Ou ter maxi 11a e (PI. XX, fig. 5): the outer lobe of trapezoidal form, the triangular 



distal part being about the only one which is covered with hairs. Few hairs only form the 



longitudinal row which runs from the outer to the inner lobe. The latter has a rounded surface, 



and bears not very numerous feathered hairs along the inner and inferior margins. 



N o te. The description of the parts of the mouth given above is for the specimen from Station 204. 



In one of the specimens from Station 289 the difference between the distances of teeth 



1 and 2, and 2 and 3 of the mandibles is greater, and tooth 4 is not developed in the 



mandible of the right side. The maxillae have 3 and 4 middle-spines ; the outer maxillae 



have the outer lobe somewhat shorter and broader, and the hairs disposed towards the 



inner lobe are less numerous. 



Cirri. First pair. The cirrus of the one side has 7 ancl 11, that of the other 7 and 

 12 segments; the inner face of the segments is rounded, but cannot be said to be protuberant. 

 Second pair has nearly equal rami of 8 and 10 segments. 



Third pair has 10 and 11 segments in the two rami. Segments 2 — 9 (PI. XX, fig. 6) 

 of the longer ramus, and 3 — 8 of the shorter bear well-developed groups of small, straight, and 

 not recurved, triangular teeth along the inner face and between the spines on the distal half of 

 that face. The teeth are situated on the face of the segitients and at a little distance from 

 the margin. 



Fourth-sixth pairs. Number of segments slightly increases from the 4 th to the 6 th 

 pair; the greatest number is not much over 20. Pairs of spines disposed on the inner face of 

 the segments of the 4 th cirrus, four only; on some of the segments of the 5 tU cirrus and on 

 most of the 6 th (PI. XX, fig. 7) this number, however, is five. The middle segments are twice 

 as long as broad, the basal ones shorter, the distal ones longer; the very last one is, however, 

 short and slender. 



No te. The cirri of the specimen from Station 289 correspond in general with this description. 

 The number of segments, however, is smaller: the first cirrus has 5 to 6 and 10 seg- 

 ments, the second 7 and 8, the third 8 and 9, the fourth 16 and the sixth 19 segments. 

 The teeth on the protuberant parts of the middle segments of the longer ramus of the 

 3 ld cirrus are present — but they are very small. Three or four segments only of the 

 6 th cirrus have 5 pairs of spines on their inner faces, all the others have at the most 4 pairs. 

 Penis long, curled ; few hairs only scattered over the surface, a little tuft of hairs 

 situated at the extremity. 



This species was dredged by H. M. S. "Siboga" at two different Stations: 



Stat. 204. Sept. 20, 1899. Lat. 4°2o'S.,- Long. 1 22° 58' E. Between islands of Wowoni and 

 Buton ; Northern entrance of Buton-strait. Depth from 75 — 94 m. Bottom : sand 

 with dead shells. The Balanus is attached to the tube of au Annelid. 



Stat. 289. January 20, 1900. Lat. 9°o'.3 S., Long. I2Ó°24'.5 E. Depth 112 m. Bottom: mud, 

 sand and shells. Group of 3 to 4 small specimens. 



76 



