348 
THE VOYAGE OF H.M.S. CHALLENGER. 
spinous. The presence of the normal serratures along these adventitious processes, how- 
ever, shows their real nature. 
The inferior bristles have long, tapering, serrated tips, and a peculiar articulation with 
the shaft (PL XXIIa. fig. 11), which presents a slight constriction, and then a curvature 
below the extremity. In the ordinary position under examination (as in the figure), the 
opacity at the base of the terminal whip is caused by its overlapping the long process 
at the end of the shaft. 
The small form accompanying the preceding, while, agreeing in general appearance, 
differs in having branchiae, which are rather long, simple processes, commencing on the 
thirty-second foot, and continuing to the sixtieth. The structure of the feet is otherwise 
similar. The inferior bristles, however, differ slightly at the articulation between the 
shaft and tip, but probably this is due to the age of the example. 
The section of the body-wall of the large specimen presents certain resemblances to 
Glycera capitata, the nerve-area in both passing from the hypoderm to the inner border 
of the ventral longitudinal muscles. The oblique fibres bounding the inner border of the 
latter decussate over its summit. The shape of the area above the transverse inferior 
region, however, is more distinctly ovoid, and within the pale outer investment of the area 
is a well-marked granular ring split into two divisions by a central streak. Two neural 
(ianals exist superiorly. A feature very slightly indicated in Glycera capitata is here very 
evident, viz., the demarcation of an inner division of the longitudinal ventral muscles on 
each side of the nerve-area, by a triangular granular region on the internal border 
opposite the commencement of the external circular coat. The latter is strongly 
developed. The extruded proboscis agrees in structure with the British species just 
mentioned, and the papillae are proportionally about the same size. The smaller example 
does not show the internal division of the ventral longitudinal muscles so distinctly, but 
otherwise is identical in structure. 
A species of Glycera dredged at Station 174c (south of the Fiji Islands), August 3, 
1874, seems to be very closely allied to the foregoing. The Station indicated is in lat. 
19° 7' S., long. 178° 19' E.; depth, 610 fathoms; bottom temperature 39°'0, surface 
temperature 78°‘0 ; sea-bottom, coral mud. 
The specimen is both injured and incomplete. The total length (exclusive of the 
exserted proboscis) is about 45 mm., with a breadth of 3'5 mm. across the feet at the 
widest part anteriorly. Its condition is such that a minute description would mislead. 
It appears, however, to be very near the foregoing, the chief distinctions being the 
deeper yellowish hue of the bristles, the somewhat longer snout, and the earlier 
commencement of the branchiae on the anterior segments. The papillae of the proboscis 
are very similar. 
In section this softened specimen differs from the former species [Glycera lamelli- 
formis) in tlie more evident differentiation of the internal part of the ventral longitudinal 
