38 Prof. M'lntosh's Notes from the 



than in the middle of the series. From this bifid region the 

 tip is curved downward and inward. 



The bristles are in two groups, a longer and a shorter 

 series. The former are pale golden slender bristles with 

 shafts that are more slender than their pale bases and 

 taper distally to the curved wiugless tip. In the shorter 

 series only the curved tips, which are more slender than the 

 foregoing, project beyond the surface. The margin from 

 which the bristles issue slopes inward as it passes ventrally, 

 and the fascicle has a twist as in Grymaa. 



The first uucinigerous process occurs as a slightly elevated 

 ridge at the posterior part of the segment following the 

 last bristle-bundle, and the succeeding processes gradually 

 increase in prominence until they form bosses or papillae, 

 like the feet of caterpillars, along the ventro-lateral region 

 of the body to the tail, the terminal processes being small 

 and closely arranged. The single row of hooks lies on 

 the anterior face of the tip. The anterior hooks show a 

 considerably longer base than that in Malmgren^s figure, 

 the anterior outline, below the main fang, having a slight 

 convexity about its middle, whilst at its junction with the 

 posterior outline a distinct shoulder occurs. The main fang 

 is large and acute, and the tooth above it is of considerable 

 size, though not so large as in Malmgren^s figure. The 

 inferior outline of the base is slightly convex behind the 

 middle, but generally sIioavs an inflection in its progress 

 towards the jn'ow. The posterior hooks retain the main fea- 

 tures just mentioned, though the base is somewhat shorter 

 and a trace of another tooth occurs in some on the croAvn. 



The twenty-second species is Poly cirrus tribullata, M'Intosh, 

 dredged l)y J. G. Jefi^'reys, 90 fathoms off N. Unst. June and 

 July 1867. 



The cephalic region, lips, and tentacles are of the usual 

 Polycirrid character ; no ventral plates occur, only a 

 somewhat raised central line. This form has a very ex- 

 ceptional structure, even more so than LysiUa loveni, for 

 neither bristles nor hooks could be observed in the single 

 example. The skin has a minutely granular aspect under the 

 lens. Three very well-marked, circular, flattened processes 

 existed on each side on the sixth, seventh, and eighth seg- 

 ments, but no bristle or hook was present. Each consisted 

 of an elevated ring externally with a pa^nlla in the centre. 

 Two minute papillae Avere Adsible on the segments (one on 

 each) in front, but only a trace of an elevation on those 

 behind. Each segment anteriorly Avas two-ringed. 



