Gatty Marine Laboratory^ St. Andrews. 9 



were shorter, with broader bases and more rapidly tapered 

 tips (PI. III. lij?. 4.Z/). 



The second kind of bristles are long, straight, and more 

 slender (Pi. III. figs. 5 & 6), more needle-like in shajjc, 

 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 a[)[)arently 

 whorled, and thus slightly oblicpie lines cross the bristle. 

 This marked diflcrentiation of the tip is rare in the Puly- 

 ehjets, the serrations, as a rule, gradually becoming less and 

 less and finally disappearing. Plere the transition is abrupt. 

 The third kind of bristles are remarkable in a Chloroemid, 

 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 

 Folynoidffi, Sigalionida?, and MacrocJueta, Avhilst 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 Kadiolarians, 



Melinna busjiii"^, sp. n. 



A pulpy and fragmentary Melinna was dredged by the 

 'Challenger' at Station 157, on INIareh 3rd, 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 

 branehise, 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 Tvings 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. 



