collected in the Sea of Spitzbergen. 55 



liar coloration of the Baltic form, it seems probable that this 

 has retained, since the glacial period, the original coloration, 

 from which the two races of the Spitzbergen Sea have sub- 

 sequently been developed by differentiation. 



I may remark, further, that I found in the intestine of one of 

 the largest greyish -green animals a perfectly preserved bivalve 

 shell {Nucula, sp.) 8 millims. in length, 4 millims. in thick- 

 ness, and 6 millims. in depth, an evidence of the large size of 

 the animals which these worms are able to seize upon for 

 their nourishment. 



3Ielcem's Loveni (Malmg.). Advent Bay, Zweigletscher- 

 bucht. 



Nephthys longisetosa ((Erst., Malmg.). Storfjord. 

 Phyllodoce gronlandica (CErst., Malmg.). Storfjord. 

 Mysta harhata (Malmg.). Storfjord. 



New to the arctic fauna. Malmgren knew the animal only 

 from the shore of Bohuslan. 



Eteone arctica (Malmg.). Advent Bay. 

 uNereis zonata (Malmg.). Zweigletscherbucht. 

 Lumhriconereis fragiUs (O. F. Mlill.). Storfjord, Zweiglet- 

 scherbucht. 



Scoloplos armiger (Miill.). Storfjord. 

 : C^ravisia Forhesi (Johnst.). Storfjord. 

 Brada mhahilis (H. R.). Storfjord. 

 Brada granulata (Malmg.) . Zweigletscherbucht. 

 Amphitrite cirrata (Miill.). Storfjord. 

 Scione lohata (Malmg.). Storfjord. 



Of this species I found a large specimen, which agreed in 

 all points, except a peculiarity which will be mentioned im- 

 mediately, with the description given by Malmgren. The 

 worm was enclosed in its tube, which consists of a fine smooth 

 membrane, the, outer surface of which was coated by a dense 

 mass of mud, to which various kinds of foreign matters ad- 

 hered. It was very remarkable that a little way behind the 

 orifice of the anterior, wider portion of the tube, the wide en- 

 trance into it was closed by a transversely placed plate, as if 

 by an operculum ; for a closure of this kind, such as occurs in 

 the tubes of Serpulacese, has not, so far as I know, been hitherto 

 •observed in a tube which evidently belonged to a Terebel- 

 lacean. I therefore split up the tube longitudinally with care, 

 exposing its inmate, the Scione lohata^ and ascertained that 

 in reality the closure of the tube was effected by an oper- 

 culum which was formed by a tentacle of the worm. Imme- 

 diately behind the operculum was the worm, and nearest to it 

 the closely compressed circlet of tentacles. On examining the 

 worm after its removal, I was able to ascertain with certainty 



