2ÓI 



Ou ter maxilla distinctly bilobed ; upper lobe broad, almost quadrate, outer margin 

 rounded, inner margin straight; hairs situated near the extremity and over the inner half of 

 the surface; inner lobe short, with not very numerous hairs over the inner half of its surface; 

 opening of the segmental-organ not at the end of a projection, but at the surface of the 

 basal part of the maxilla. 



Cirri. Cirrus of first pair situated near the mouth and having the longer ratnus 

 twice as long as the shorter; the latter has 6, the former 11 segments. The form of the 

 segments is nearly quadrate, with the inner margin rounded. The relatively long spines are 

 arranged on the longer ramus in two transverse rows, near the extremity of each segment; 

 they are distributed on the shorter ramus in more irregular groups over the whole surface of 

 each segment. 



Cirrus of second pair with slightly unequal rami of 7 and 8 segments ; all the segments 

 distinctly protuberant at the inner side. The whole surface of the segments is covered with 

 rather long and thin straight spines, those at the outer side near the extremity of the distal 

 segments and at the tip of the last segments of both rami being somewhat stronger. 



Cirri of third pair of the same type as those of the first and second pairs. Number 

 of segments- in the two rami 8 and 9. Inner side of segments less protuberant than in the 

 cirrus of the second pair. Hairs on the surface of most segments numerous and thin, forming 

 a more dense central tuft, and radiating from there in all directions. 



Cirri of fourth-sixth pairs not very elongate and composed of 

 ió — 17 segments in the fourth cirrus, 

 18 — 19 segments in the fifth cirrus, and 

 20 — 2 1 segments in the sixth cirrus. 



Most segments bear, on their inner face, three pairs of spines, the lowest of which is 

 much smaller, and as a rule a fourth pair of quite rudimentary spines. The segments grow 

 longer and narrower towards the distal extremity of the ramus, the longest being about two 

 and a half times as long as broad. 



Penis remarkably long, more than three times as long as the sixth cirrus, tapering 

 towards the extremity, with short hairs here and there, and a circle of such hairs round 

 the extremity. 



The small and straight projecting point at the dorsal basis of the penis, known 

 to Darwtn already as occurring in the species of this genus, is well-developed also in the present 

 species. lts apex is sharply pointed. 



Two specimens of this species were found attached to a coral [Caryophyllia sp.) 



which was collected at : 



Stat. 251. December 8, 1S99. Lat. 5 28'-4 S., Long. i32°o'.2E. Depth 204 m. Bottom : hard 

 coral-sand. 



General Remarks. Although it has not been possible, from want of material, 

 to give the description of this species so detailed and so accurate, as might be desired, 

 especially as regards the structure of the shell, the sheath, the basis etc, there can be 

 hardly any doubt as to its being different from any of the species described by Darwix. 



