from the North Sea and adjacent parts. 255 



The fragments are very much lacerated, but tlie feet, 

 whicli are close together, are not damaged, and agree with 

 those on the type-slides. One of the fragments coTitains feet 

 which must come before the filtieth foot, because the ventral 

 division shows no long winged hooks, which only appear about 

 the liftietli. However, there is some uncertainty where the 

 hooks commence, for according to De St, Joseph they appear 

 between the thirtieth and the fifty-second, while another 

 investigator, Mesnil, records their appearance from the thirty- 

 fifth to the tiiirty-seventh. The hooks are very powerful, 

 having strong stout shafts which are curved and prominently 

 striated, the hooks themselves facing upwards. The wings 

 are large and extend to the surface of the lamella. Accom- 

 panying the hooks are slender, finely pointed, smooth bristles 

 whose tips reach upwards beyond the hooks, while ventrally 

 beyond the last hook there is a cluster of six or seven — three, 

 according to Prof. M'Intosh, — which are minutely striated. 

 In all the slender bristles tlie tips are curved and face down- 

 wards. The dorsal bristles are long, slender, and finely 

 pointed, the length extending beyond the lamella being only 

 about one-fourth the total length. The bristles arise close 

 together and spread out fan-wise as they extend outwards. 

 The bases are sheathed in muscles, which move them. The 

 branchiae which are present on all the feet of the fragments 

 are large, bluntly conical, and present edges having a frilled 

 appearance. Prof. M'Intosh remarks that in life the lameliaj 

 of the feet as well as the branciiia?, which meet those of the 

 opposite side in the front, are muscular and perform various 

 movements. 



The body-wall of this species is very thick and muscular, 

 and thus presents a condition totally difl'erent from that of 

 many of the Eunicidse, which have body-walls so thin that 

 the fseces in the gut appear as green masses. I was unable 

 to obtain any nephridia, but one fragment contained ova 

 which were fairly large in size and opaque in colour. Tlie 

 gut, which was exposed in parts, is fairly wide and is covered 

 by a white-coloured tissue which has been probably discoloured 

 by the preserving fluid. The contents of the gut were sand, 

 debris, and brown masses which appeared like pieces of tissue. 

 It is doubtful whether the animals are carnivorous or not. 



The fragments were taken along with several Polynoidae 

 which were worked out by Mr. W. Small. 



Bibliography. 



IzuKA. 1912. ' The Errantiate Polychseta of Japan.' 

 Malmgren. 1865. * Nordiska Hafs-Annulater.' Stockliolm. 



