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THE VOYAGE OF H.M.S. CHALLENGER. 
what flattened. The reproductive elements (male) are present in the bases of the 
feet. 
This form differs from any known genus. 
Polynoe magni'pal'pa, n. sp. (PL XIII. fig. 6 ; PL XIV. figs. 1,6; PL XYIII. fig. 5 ; 
PL Xa. figs. 5, 6). 
Habitat . — Trawled at Station 171 (a little north of the Kermadec Islands), July 15, 
1874; lat. 28° 33' S., long. 177° 50' W. ; depth, 600 fathoms; bottom temperature 
3 9° '5, surface temperature 6 6° '5 ; hard ground. 
The length of the male is 17 mm. and its breadth about 4*5 mm. The females 
measure about 8 mm., and have a breadth of 4 mm. 
In the female (PL XIV. fig. 6), which was that first noticed, the body is short 
(almost elongate ovoid in outline) and the palpi conspicuously large. 
The head in the same sex (PL XIII. fig. 6) is somewhat short in antero-posterior 
diameter, and wide transversely. Two large black eyes are jjlaced at the posterior 
border and wide apart, and two larger with pale centres occur on the prominent lateral 
region, and therefore little removed from the former. The tentacle is absent, but it 
arose from the anterior border of the head. The antennae are short and subulate, and 
are widely separated from the tentacle, springing just under the slight anterior peak of 
the head. The palpi are proportionally large, much dilated in the middle, but finely 
tapered at the tip. They appear to be nearly smooth, a few translucent and slender 
papillae only appearing along the edges. The dorsal cirri in several instances present 
remarkably tumid columns, the tijDS being finely tapered. Others are simple tapering 
organs like the tentacular cirri. They also show a very few short clavate papillae on 
their surface. The ventral cirrus is somewhat longer than in the male, and its filiform 
tip extends beyond the bases of the bristles. The enlargement from which the ventral 
papilla springs is much more conspicuous than in the other sex. 
The scales (PL XVIII. fig. 5) are thin, pale, and somewhat translucent, the anterior 
being minutely spinous over nearly the whole area, a few short clavate cilia appearmg 
along the posterior border. The posterior, again, are minutely granular, with a few 
short clavate papillae along the free border. Within the scale are a number of branched 
gland-like structures resembling fragments of granular vermicelli. These are especially 
conspicuous just inside the margin. Moreover, the surface of the scale has minute black 
grains. The scales almost entirely cover the dorsum. 
The feet of the female are smaller (for the entire animal is less) than those of the 
male, but their general configuration corresponds. The dorsal branch bears a tuft of pale 
bristles of two kinds, those next the ventral being rather attenuate and long, with weU- 
