34 0- Nordgaard. [No. 2 



Explanation of the plates. 

 pi. i. 



Fig. 1. Microporella impressa; Audouin. On a stone from Ham- 

 merfest. 



Fig. 2. Smittia arctica, Norman. An old specimen from Hammer- 

 fest. 



Fig. 3. Umbonula verrucosa, Esper. Tåken on a laminaria root 

 from Hjeltefjord (Bergen). 



Fig. 4. Porella proboscidea, Hincks. On a hydroid from Mehavn 

 in East Finmark. 



Fig. 5. Muccronella peachti, Johnston. Old specimen on cyprina 

 (Mehavn). 



Fig. 6. Muccronella (lepralia) sincera, Smitt (Nordkap). 



pl il 



Fig. 1. Smittia porifera, Smitt. On a shell from Mehavn. 



Fig. 2. Smittia lineata, n. sp. On a worm tube from Nordkyn. 

 a. The avicularium, o the ooecium. 



Fig. 3. Cribrillina nitido-punctata, Smitt. n. sp. On a stone from 

 Hammerfest. 



Fig. 4. Smittia landsborovii, Johnston. On an ascidian from 

 Byfjorden (Bergen). 



Fig. 5. Menipea jeffreysii, Norman. (Bergen), p. The contracted 

 polypide of the atten ding hydroid. 



Fig. 6. Porina tubidosa, Norman. On ptilota plumosa at Ham- 

 merfest. 



Fig. 7. Is showing the porus-building in the same specimen. 



