1903] On the Nemerteans of Norway. 19 



on the dorsal surface of the snout on either side. They extend 

 from the tip of the head as far back as the level where the 

 brain commences. It is interesting to note their presence in 

 a form which dwells at a depth of 250 fathoms. This is the 

 more remarkable as eyes were not present in any of the 

 Heteronemerteans dredged at a depth of more than 100 

 fathoms. Among the Challenger Nemerteans were three spe- 

 cies of Eupolia (E. australis, E. giardii, and E. nipponensis) 

 from depths of over 300 fathoms. With very few exceptions 

 the many species of this genus are provided with numerous 

 eyes. The uniform absence of such structures in these deep 

 water species makes their presence the more remarkable in 

 L. einerens. It is not unlikely that this last species is a 

 recent immigrant from shallower Arctic Seas into deep er 

 fjord water and that the eyes are undergoing a process of 

 reduction. 1 ) 



9. Lineus longissimus (Gunnerus, 1700(. 



A specimen from Alverstrøm (near Bergen) in a depth of 7 — 

 10 metres (litoral zone). 



10. Lineus bilineatus (Mc Intosh, 1873). 



A specimen dredged in the Byfjord off Ask, from a depth of 

 100 metres on a rocky bottom. Length about 10 cm. when alive. 

 Colour yellowish chocolate with the characteristic yellow dorsal lines. 



11. Micrura varicolor n. lp. 



Localities. Bergen; dredged in the Byfjord off Ask, in about 100 

 metres on rocky and also on pebbly bottom.. zVlso one spe- 

 cimen from Larsnes in Lyngenfjord dredged in about 50 metres. 



Occurrence; fairly common. 



External features: small and somewhat thick species measuring 

 from 10 — 20 mm. in life. Colour variable. In some the co- 

 lour was reddish purple on the dorsal surface and pale brown 



!) cf. P. 5. 



