collected in the Sea of Spitzhergen. 55 



liar coloration of the Baltic tonn, it seein.s probable that this 

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

 from which the two races of tne Spitzbcrgen Sea have sub- 

 sequently been develo])ed bv differentiation. 



1 may remark, further, that 1 found in the intestine of one of 

 the largest greyish-green animals a perfectly jireserved bivalve 

 shell {Xurtila, sj).) 8 millinis, in length, 4 millims. in thick- 

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

 the animals which these worms arc able to seize upon for 

 their nourishment. 



^^ef(rnis Loveni (Malmg.). Advent Bay, Zweigletscher- 

 bueht. 



Nephthjfs lonfjisetosa (Qi^rst., Malmg.). Storfjord. 



Phyllodoce <jr'6nIamUca (Q^rst., Malmg.). Stortjord. 



Mysta barhata (Malmg.). Storljord. 



New to the arctic fauna, Malmgrcn knew the animal only 

 from the shore of Bohusljin. 



Eteone arctica (Malmg.). Advent Bay. 



Nereis zonata (Malm^.). Zweigletscherbucht. 



Lumbriconereis fragUis (0. F. Miill.). Storfjord, Zweiglet- 

 scherbucht. 



Scolophs armiger (Miill.). Storfjord. 



Travisia Forbesi (Jolinst.). Storfjord. 



Brada inhabilis (H. B.). Storfjord. 



Brada granulata (Malmg.). Zweigletscherbucht. 



Amphitrite cirrata (Miill.). Storfjord. 



Sci'one lobata (Malmg.). Storfjord. 



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

 all ])oints, 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 line 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 Serpulaceai, 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 lobata^ 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 

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



