REPORT ON THE ANNELIDA. 
81 
tip has a peculiar knife-edge appearance on the anterior or spinous margin. Parasitic 
Loxosomce are frequently attached to them. 
The ventral bristles (PI. VIa. fig. 11) are long and slender, but the tips conform to 
the structure in Lagisca, the weak secondary process being diagnostic. The pigment 
alluded to in the dorsal division is continued to the spinigerous process of the ventral, 
and nearly forms a ring round it. An Exogone with its buds occurred amongst the 
debris on these bristles. 
The scales (PI. XVIII. fig. 1) are fifteen pairs, their most prominent feature being a 
series of characteristic rotate (almost globular) papillae along the posterior border. 
The first scale as usual is rounded, and besides the conspicuous papillae along its posterior 
border, a group of smaller processes occurs in its centre, and a few larger appear 
over the central region of most posteriorly. The scales are mottled with brownish 
pigment, which is situated under the spinose dorsal cuticle, and often show a dark brown 
patch in the centre. Besides the numerous conical papillae, a fringe of cilia occurs along 
their outer border. The latter are longest on the posterior scales, which also have a few 
elongated papillae instead of the globular processes on the posterior border. The surface 
of the scale is minutely spinous ; and most present a curiously thickened and elevated 
area toward the posterior part of the inner border. 
The cuticle on the under surface of the scale is continuous with that of the scale- 
papilla, the thickest part of the organ occurring just over this region, the hypoderm 
dipping downward at the point of attachment, while the roof of the scar forms an arch, 
so that the area is thinnest in the middle. In the hypoderm of the dorsal process for 
the scale are a series of muscular fibres, vertical, circular, and oblique, so that considerable 
motion is provided for. In one of the sections, moreover, a rounded cellulo -granular 
body like a ganglion with a branch or two was situated just below the muscular fibres, 
beneath the scale. A thin stratum or layer, apparently continuous with the hypoderm, 
bridges over the summit of the scale-pillar. The fibres of the hypoderm of the scale 
are directed in a radiate manner from the fold of attachment to the scar, sloping 
inward and upward to the arch, to the central line of which many go, and interlace 
with others in a very complex manner. 
The alimentary canal contained elongated masses, amongst which fragments of sessile- 
eyed Crustacea, soft odontophorus Mollusca, probably Pteropods, and quantities of 
Diatoms, which seem to have been in the stomachs of their prey. 
This species approaches Grube’s Polynoe vesiculosa,^ procured during the expedition 
in the German ship “ Gazelle,” from the Strait of Magellan. Both have slightly bidentate 
tips to the inferior bristles, and the structure of the scales is closely allied. It diverges 
in the colour of the dorsal cirri, and in the structure of their cilia, which are stated to 
be setiform in Polynoe vesiculosa. Grube’s example was only 21 mm. in length, and 
^ Monatsber. d. h. preuss. Akad. d, Wiss. Berlin, August 1877, p. 514. 
(ZOOL. CHALL. EXP. — PART XXXIV. — 1885.) 
LI 11 
