Fig. 



4. 



Fig. 



5. 



Fig. 



6. 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10. 



86 N. ODHNER, NORTHERN AND ARCTIC INVERTEBRATES. VI. PROSOBRANCHIA. 2 SEMIPROBOSCIDIFERA. 



The same, Beeren Island — Norway (1898), 1. 13. X 1.6. 



The same, Bel Sound, Spitzbergen, 1. 23. 



The same, Smeerenburg Bay, Spitzbergen, I. 21.4. 



The same, Ice Fiord, off Tundra Bay (Sp. Exp. 1908, St. 21), forma typica = var. expansa G. O. Särs 



1878, 1. 18.3. 



The same. Cape Jakon (Vega Exp. No. 60), 1. 21.5. 



The same, Actinia Bay (Vega Exp. No. 29), 1. 14.7. 



The same, var. zonata Gould, Ice Fiord, Billen Bay (Sp. Exp. 1908, St. 87), shell from aperture and animal 



from dorsal side. X 1.6. 

 Fig. 11. Velutina insculpta n. sp., Ice Fiord, off Advent Bay (Sp. Exp. 1908, St. 104), shell from aperture and ani- 

 mal from dorsal side. X 1.6. 

 Fig. 12. The same, var. ampla n. var., Low Island, Spitzbergen, 1 sh., 1. 10. 6, nat. size and X 2.2. 

 Fig. 13. The same, Waygat Islands, Spitzbergen, 1. 18. 



Fig. 14. The same, N. of The Seven Islands (1898), 1 sh., 1. 13, with an Actinia. 

 Fig. 15. Velutina undata Brown, osphradium and ctenidium, seen from inside, X 5. Sp. from Beeren Island — 



Norway (1898; Fig. 4). 

 Fig. 16. Velutina insculpta n. sp., osphradium and ctenidum, seen from inside, X 5. Sp. from Ice Fiord (= Fig. 11). 

 Fig. 17. Onchidiojjsis glacialis (M. Särs), shell from above, East Greenland, Mackenzie Bay (= O. groenlandica of 



llägg 1905), 1. 27. 

 Fig. 18. The same, shell from above, Bel Sound, 1. 24. 



Fig. 19. Onchidiopsis groenlandica Bergh, shell from above. Dickson Bay, Ice Fiord, St. 122 (1908), 1. 24. 

 Fig. 20. Onchidiopsis latissima n. sp., shell fi'om above, Mossel Bay, 1. 26. 

 Fig. 21. The same, shell from above, off Treurenburg Bay, 1. 28. 

 Fig. 22. The same, animal from above and from below, Mossel Bay, 1. 35. 



Fig. 23. Onchidiopsis glacialis (M. Särs), E. Greenland, animal from above and from below, 1. 37. 

 Fig. 24. The same, Bel Sound, 1. 33. 

 Fig. 25. Onchidiopsis groenlandica Bergh, Ice Fiord 1908, St. 122, 1. 34. 



In the specimens of Onchidiopsis figiued, the exteriör mantle has been cut open and reflected, to show the 

 characteristics of the subijallial organs. 



Plate 3. 



Figs. 1—37. 



Natica clausa Broderip & Sowerby, Godhavn, Greenland, h. 30. 



The same. Proven, Greenland (Torell), h. 28. 



The same, Greenland, no definite locality (Torell), h. 25.5. 



Natica bathybii Friele var. oblonga, East Greenland (= N. clausa of Hägg 1905), h 16.4. X 1..6 



Natica clausa Broderip & Sowerby, Raufarhofn, Iceland (Torell), h. 19. 



The same, Ilofsos, Iceland (Torell), h. 6.2. 



The same, Ice Fiord, between Green Bay and Coles Bay (Sp. Exp. 1908, St. 127, 25 m), h. 12.5. X 1.6. 



The same, Ice Fiord, North Branch (Sp. Exp. 1908, St. 92, 85—45 m), h. 11.2. X 1.6. 



The same, Ice Fiord (Sp. Exp. 1908, St. 41, 234—254 m), h. 11. X 1.6. 



The same, Ice Fiord, Advent Bay (Sp. Exp. 1908, St. 45, 70—42 m), h. 25. 



The same. Maskenses, Finmark, max. h. 23. 



The same, Skagerrack, 336 fms (Lindahl), h. 9.6. X 1.6. 



The same, Koster, 10—15 fms (1863), h. 8.6. X 1.6. 



The same, Gullmarn, h. 9.2. X 1.6. 



Lunatia palhda (Broderip »& Sowerby), Sukkertoppen, Greenland (Amondsen), h. 15.2. 



Natica clausa Broderip & Sowerby, Vega St. 1042, h. 40 and 37.6. 



The same. Finmark (Sparre Schneider), h. 17.5. 



Natica bathybii Friele (original), Norw. North Atlant. Exp. St. 251, h. 8.2. X 2. 



Lunatia palhda (Broderip & Sowerby), Treurenburg Bay, Spitzbergen, 6 — 25 fms (1861), h. 37. 



The same, Hinlopen, Spitzbergen, seen from the spire, 10 — 25 fms (1861), h. 25.6. 



The same, the same specimen as in fig. 20, seen from aperture. 



The same, Shoal Point, Spitzbergen (1861), h. 20. 



The same, Ice Fiord (1864), h. 26 (det. as »Natica glacialis» by Loven). 



The same, Ice Fiord (1861), h. 22. 



Fig. 



1. 



Fig. 



2. 



Fig. 



3 



Fig. 



4 



Fig. 



5 



Fig. 



6 



Fig. 



7. 



Fig. 



8. 



Fig. 



9. 



Fig. 



10 



Fig. 



11. 



Fig. 



12 



Fig. 



13 



Fig. 



14 



Fig. 



15. 



Fig. 



16. 



Fig. 



17 



Fig. 



18. 



Fig. 



19. 



Fig. 



20 



Fig. 



21 



Fig. 



22 



Fig. 



23 



Fig. 



24 



