38 Prof. :M'Intosli's Notes from the 



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

 tip is curved downward and in^ya^d. 



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

 series. The former arc pale golden slender bristles with 

 shafts tliat are more slender than their pale bases and 

 taper distally to the curved wingless 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 vcntrally, 

 and the fascicle has a twist as in Gnjmaa. 



The first nncinigerous 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 cater[)illars, 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 INlalmgren'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 al)Ove it is of consideraljle 

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

 inferior outline of the base is slightly convex behind the 

 middle, but generally shows an* inflection in its progress 

 towards the prow. 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 crown. 



The twenty-second species is Pohjcirrns tribullata, jNPIntosh, 

 dredged bv J. G. JcfiVeys, 90 fathoms off N. Unst, June and 

 July 18G7'. 



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

 Polycirrid character ; no ventral plates occur, only a 

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

 ceptional structure, even more so than Lysilla 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 w^as present. Each consisted 

 of an elevated ring externally with a papilla in the centre. 

 Two minute papillte were visible on the segments (one on 

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

 behind. Each segment anteriorly was two-ringed. 



