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Outer 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 ramus 
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 g. 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 
16—17 segments in the fourth cirrus, 
18—19 segments in the fifth cirrus, and 
20—21 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 Darwin already as occurring in the species of this genus, is well-developed also in the present 
species. Its 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, 1899. Lat. 5°28'.4S., Long. 132 
coral-sand. 
o.2 E. Depth 204 m. Bottom: hard 
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 Darwiy. 
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