KONGL. SV. VET. AKADEMIENS HANDLING AK. BAND 20. N:0 5. 333 



Explanation of tlie figures. 



PLATE 1. 

 Lithotliamnion soriferum. 



Fig. 1. Young speciraen. '/j. 



» 2. Somewhat older specimen, seen from above. Vi- 



» 3. The same specimen, seen from below. '/j. 



» 4. Full-grown specimen. Vi- 



» 5. Half of a younger specimen, seen from the cleaving-surface. '/j. 



» 6 — 10. Brancli-systems of different development. '/j. 



» 11. Branch with conceptacles of sporangia. Vi- 



» 12. Part of transversal thin section') of a branch. *"/!. 



« 13. Part of median thin sectiou of a branch. **/j. 



» lå. Part of one of the outer concentrio layers of a transversal thin sectiou. ^""Z,. 



» 15. Part of the central layer of a transversal thin section. '""'/i. 



» 16. Part of a superficial tangential thin section. *""/!- 



" 18. Part of the roof of a conceptacle of sporangia, delivered from lime. '"%• 



» 19. Sporangiura. 3»%. 



PLATE 2. 

 Lithothamnion glaciale. 



Fig. 1. Older, full-grown specimen, seen from above. Vi- 

 » 2. The same, seen from below. Vi- 



PLATE 3. 



Lithotliamnion glaciale. 



Fig. 1. Young specimen, surroundiug part of a stone. Vi- 

 » 2. Somewhat older specimen, completely inclosing a stone. Vi- 



') Thiu section = slice made thin by grinding. 



