Gatly Marine Laboratory, St. Andrews. 9 
were shorter, with broader bases and more rapidly tapered 
tips (Pl. III. fig. 4d). 
The second kind of bristles are long, straight, and more 
slender (Pl. III. figs. 5 & 6), more needle-like in shape, 
and minutely serrated throughout the distal half, the 
basal region being smooth and translucent, the tip finely 
tapered and devoid of spikes. The latter are apparently 
whorled, and thus slightly oblique lines cross the bristle. 
This marked differentiation of the tip is rare in the Poly- 
chets, the serrations, as a rule, gradually becoming less and 
less and finally disappearing. Here the transition is abrupt. 
The third kind of bristles are remarkable in a Chlorcemid, 
for they are large, translucent, thin-walled bristles, quite 
visible to the naked eye, curved at the tip and ending in a 
blunt hook with a secondary process beneath, as in certain 
Polynoide, Sigalionidz, and Macrocheta, whilst the convex 
outline is double (showing that the tissue is here thicker) 
and very minutely serrated (PI. III. figs.7 & 8). The double 
contour of the serrated or convex edge indicates a thicker wall. 
A developing tip or two generally occur in the tuft, the bifid 
tip and a short portion of the shaft being present. 
The separated proboscis is a cup-shaped muscular organ, 
and like the gut was filled with whitish ooze crowded with 
tests of Diatoms, spicules of sponges, and a few Radiolarians. 
Melinna buskii*, sp. n. 
A pulpy and fragmentary Melinna was dredged by the 
‘Chailenger’ at Station 157, on March 8rd, 1874, in 
1950 fathoms, in the midst of the Diatom ooze, considerably 
south of Australia—a region, indeed, conspicuous for its 
novelties. Unfortunately, its condition was so unpromising 
that it was put aside during the pressure of the ‘ Challenger’ 
work. 
The anterior region in the softened example had lost its 
branchiz, and only shreds of the tentacles remained. It is 
uncertain whether the free dorsal rim of the fourth segment 
had other than the smooth edge it now shows. The number 
of the bristle-tufts is probably seventeen, though only 
fourteen or fifteen could be seen, as the body was in two 
pieces and part absent. The bristles are powerful golden 
structures, tapering distally, with narrow wings and standing 
prominently on setigerous processes. 
Posteriorly the body tapers a little and ends in an anus 
* Named after the late distinguished zoologist, Prof. G. Busk. 
