24 R. C. Punnett. [No. 2 



14. Micrura purpurea (Dalyell. 1853), 



Single specimen from Osterfjord in depth of about 100 metres 

 on rockv bottom. 



15. Micrura fasciolata (Ehrexberg, 1831). 



Alverstrøm (near Bergen) from 30 metres on rocky bottom. 

 Two specimens together on an empty Cyprina shell, and shewing 

 the two colour varieties. One was of a dull green hue whilst the 

 otlier was bright crimson. The transverse bands were very indistinct 

 in both specimens. 



16. Cerebratulus norvegicus n. sp. 



Loccdities. Bergen, Hjeltefjord from 50 metres on hard bottom with 

 pieces of mussel shells. 



Alverstrøm (near Bergen) from 80 metres on shell sand. 



Radøsund (near Bergen) from 70 — 80 metres on bottom 

 of mud and small stones. 



Mo fjord (near Bergen), from 18—20 metres on bottom of 

 mud and shell. 

 Occiirrence. Several cpmplete specimens and numerous fragments 

 obtained. This is perhaps the most common of the Nemer- 

 teans found near Bergen. 

 Extemol appearance. This species is a typical Cerebratulus with 

 pointed head, dorso-ventrally flattened body, well marked side 

 folds and caudicle. Colour light gray brown above, much 

 paler below. Two small black spots are sometimes found 

 at the tip of the head. Brain, nerve cords and head slits 

 bright crimson. Colour after preservation pale dirty green. 

 wall. The epithelium is not thick and contains numerous 

 large unicellular glands. It rests on a well marked base- 

 ment membrane (Pl. I, fig. 6). Beneath this is a delicate 

 layer of circular muscle fibrils. The cutis glands are poorly 

 developed. The outer longitudinal muscle laver is 2 — 3 times 

 as thick as the circular layer. The inner longitudinal and the 

 circular layers are of about the same thickness. 



