12 GUSTAF LINDSTRÖM. 



Fig. 3. Calice from above, magnified. 



» 4. Two specimens coalesced and provided with large calicular expansions. 



» 5. Calice of a small specimen magnified. 



Coenostrorna discoideum Lonsdale. 



Fig. 6. Specimen nat. size from Östergarn. 



» 7. Part of same magnified. 



» 8. Polyparium from below, showing the epitheca. 



» 9. Variety from Wisby. 



» 10. Variety from Klinteberg. 

 » 11 & 12. Transverse sections. 



13. Longitndinal section. 



» 14. Longitudinal section of an unknown coral. 



» 15. Upper surface of Stromatopora striatella D'Okbigny ; from Wisby. 



