132 DISCOVERY REPORTS 



dorsal cirrus. The branchiae begin as a single filament on the 6th foot, are bifilamentous 

 at the 7th and have three filaments at the 30th. The latter is the maximum number for 

 these specimens. 



The first five chaetigers have capillary bristles and pseudo-compound bristles: of 

 these there are a few smaller and apparently unused examples which are hooded and 

 clearly tridentate (Fig. 49, «), but the great majority are absolutely smooth and apparently 

 without hoods (Fig. 49, b) : a few have a single tooth below the apex (Fig. 49, c). These 

 bristles are puzzling : I am inclined to regard them as old and worn examples of what 

 were once hooded tridentate bristles. The comb chaetae have about 12 rather long 

 narrow teeth. At about the 15th chaetiger a pair of bidentate hooded subacicular hooks 

 appears. The feet are supported by three rather slender yellow pointed acicula. 



The dental formula is as follows: 8 — 8 : 8+ 5 — 9: Fauvel's figure of the jaws 

 (Fig. 165 g) differs in a number of details from that of Mcintosh (1908, PI. Ixiv, fig. 2). 

 The jaws of the present specimens correspond closely to Mcintosh's figure. 



Except in regard to certain of the anterior pseudo-compound bristles, already men- 

 tioned, these specimens correspond to the descriptions of this deep-water European 

 species. Fauvel, however, states that it has no transverse colour bands : these are present 

 in my specimens. It is noteworthy that Mcintosh (1924, p. 36) has recorded the presence 

 of this species at a depth of 47 fathoms off" the Cape of Good Hope. 



Onuphis iridescens (Johnson). 



Northia iridescens, Johnson, 1901, p. 408, pi. viii, figs. 86-87; pi. ix, figs. 88-92. 

 Moore, 191 1, p. 255. 



St. 228. 2. V. 27. 53° 33' 00" S, 61° 49' 30" W. 650 m. Gear N 70 V. ? Net touched bottom. 

 Bottom: diatomic ooze. Two specimens. 



Remarks. One complete specimen and a second incomplete posteriorly. The com- 

 plete specimen measures 72 mm. by i mm. without the feet. The colour in spirit is a 

 pearly iridescent white. There are no eyes. There is a pair of globular frontal tentacles, 

 and the occipital tentacles have long ringed tentaculophores. The inner pair is the 

 longest, reaching to the 8th chaetiger, and the outer are about half their length. The 

 median reaches to the 4th chaetiger. The tentacular cirri are long and filiform. 



Johnson's figure of the 2nd foot of O. elegans (Johnson, loc. cit. PI. viii, fig. 80) is 

 exactly similar to that of this species. The long postchaetal processes are reduced to 

 small papillae by the 12th foot. The ventral cirrus begins to be absorbed by the 6th 

 foot. From about the 15th to the 25th foot the cirriform gill and dorsal cirrus are of 

 approximately the same length. Further back the cirrus becomes increasingly shorter 

 than the gill. 



In the complete specimen the gills begin on the ist chaetiger and are continued to 

 about the 40th segment from the end of the body. The gills are slender, cirriform and 

 unifilamentous throughout. 



The pygidium carries two pairs of styles, one about half the length of the other. A 

 pair of hooded bidentate subchaetal spines appear at about the 15th foot. 



