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as long as broad and with the inner and outer faces rounded; lower segments of longer ramus 
broader than long. 
Second pair: rami slightly unequal, of 7 and 8 to 9 segments in the one, and 6 and 
8 in the other specimen. Stronger, distinctly feathered spines disposed on the extremity of the 
last segment. 
Third pair: rami with 7 and 9 in the one, 7 and 8 segments in the other specimen. 
Segments of the pedicel very elongate; the first bears a tuft of long hairs directed backwards 
and quite a row of short, delicate, spine-like points along its posterior face. The anterior face 
of the segments 2 to 7 of the anterior ramus is furnished near its upper extremity with a 
row of extremely minute teeth-like spines. 
Fourth pair: rami unequal, of 12, and 15 to 16 segments. Middle segments about 
two and a half times as long as broad. Segments bear on anterior face only one pair of well- 
developed hairs or spines, and either one or two pairs of much more delicate ones. Anterior 
face of last segment of pedicel with a row of four curved teeth near distal extremity (Pl. XXII, 
fig. 1). The first and second segments of the shorter ramus show one distinct tooth and a 
minute one, and the third to fifth segments have two well-developed teeth and a small one, 
the 62 segment, however, has again one distinct tooth and a small one. Longer ramus without 
teeth along anterior face of lower segments. 
The other specimen has 14 and 18 segments in the two rami. The same cirrus has again 
4 teeth on the anterior face of the last segment of the pedicel, and the five inferior segments 
of the shorter ramus are armed with 1 or 2 teeth respectively on the anterior face of each. 
Fifth pair: the 14 lower segments of one of the rami are furnished on the anterior 
face, near the distal extremity, with a curved tooth. This tooth stands either alone, or it is 
accompanied by a small secondary tooth. 
Sixth pair: rami equal, of about 20 segments; the distal segments more elongate 
than the lower ones. As a rule three pairs of hairs on the anterior face of each segment 
(Pl. XXII, fig. 2); only one of these pairs is longer: the second pair is already short, and the 
third not or hardly visible. The number of segments in the 6 cirrus of the other specimen 
is 26, and the third pair of hairs on the anterior face, as a rule, is only to be made out 
with difficulty in this specimen. 
Penis broken off in the one specimen, and very long and tapering towards the extre- 
mity in the other specimen. 
The specimens of this species collected by H. M. S. “Siboga” came from two Stations: 
Stat. 164. August 20, 1899. Lat. 1°42'.5S., Long. 130°47'.5 E. Depth 32 m. Bottom: sand, 
small stones and shells. 
Stat. 299. January 27/29, 1900. Lat. 10°52'.4S., Long. 123° 1.1 E. Rocks- or Cyrus-bay, South 
coast of Rotti-island. Depth 34 m. Bottom: mud, coral and Lithothamnium. 
General Remarks. This is the first time that the species described by Darwin in 
1854 has been re-examined. Darwix knew it from the East Indian Archipelago and from 
the Philippine Archipelago. Although Darwiy’s specimens were longer than mine (?/, of an 
inch = 6.3 mm.), it is one of the smaller species, and as the specimens are, moreover, often 
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