215 



as long as broad and with the inner and outer faces rounded ; lower segments of longer ramus 

 broader than lono-. 



o 



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 (PI. 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 6 th 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 ao-ain 

 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 

 (PI. 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 th 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. i°42'.s S., Long. i30°47'.sE. Depth 32 m. Bottom: sand, 



small stones and shells. 

 Stat. 299. January 27/29, 1900. Lat. io°S2'.4S., Long. 123° i'.i 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 Dakwix in 

 1854 has been re-examined. Darwin knew it from the East Indian Archipelago and from 

 the Philippine Archipelago. Although Darwin's specimens were longer than mine (Y t of an 

 inch = 6.3 mm.), it is one of the smaller species, and as the specimens are, moreover, often 



87 



