190 E. r. TOMES 02f MADKEPOEAEIA EEOM THE GEEAT OOLITE. 



EXPLAJ^^ATION OF PLATE Y. 



Fig. 1. Barysmilia Etalloni : the corallum, natural size. 



2. : another specimen, natural size. 



3. ' — : some costse, magnified, showing their ramification. 



4. : a few costag, much magnified. 



5. Thamiwcoenia ooUtica -. the corallum, natural size. 



6. : a part of the corallum, magnified, showing its attachment 



to a foreign body. 



7. : some of the axillary costse, magnified. 



8. : a calice, greatly magnified, and one side cut away to show 



the septa. 

 9. Stylosmilia excelsa : part of a corallum, natural size. 



10. : a portion of the calicular surface, magnified about two 



diameters. 



11. : a worn calice, considerably magnified. 



12. : an unworn calice, considerably magnified. 



13. Enallohelia socialis : a portion of the overhanging consolidated upper 

 surface of the corallum, natural size. 



14. : part of a lateral coralLite, with a calice, much magnified. 



15. Helioccenia oolitica : the corallum, natural size. 



16. : a young calice before becoming prominent. 



17. : a worn calice, showing the lamellar columella. 



18. Stylosmilia reptans: a young corallum, natural size, attached to a 

 ThamnastrcBa. 



19. : a portion of another specimen, much magnified. 



20. : a worn calice, magnified. 



21. : another cahce on the same specimen, having very irre- 

 gularly developed septa. 

 22. Dimorphastrcsa fvAigiformis : the corallum, natural size. 

 23. : the calicular surface, natural size. 



24. Comoseris irradians : portion of a colline of a weathered specimen from 



Steeple Ashton, magnified, and showing the supposed wall. 



25. vermicularis : portion of a colline of a worn example from the 



Great Oolite of Farley Down, Bath, magnified. 



DlSCTJSSIOIf. 



Dr. HiNEE expressed Ms sense of the value of the researches of 

 Mr. Tomes on the distribution of corals in the Jurassic rocks ; but 

 expressed his regret that the specimens described were not laid on 

 tlie table for the inspection of the Fellows of the Society. 



