R. F. TOMES OX THE GEEAT-OOLTIE MADKEPOEAKIA . 195 



Nattheim ; but the figure given of the first of these shows a greater 

 development of the septa than is seen either in Michelin's figure or 

 in any of the numerous specimens which have come under my ex- 

 amination. 



It is with very great doubt that I give this species a place in the 

 Zoantharia Tabulata, not having by any means satisfied myself as to 

 its real affinities. If I am correct in referring the present species 

 to the one on which Michelin established the genus Cyatliophora, 

 the genus Cryptocoenia will have to be retained for such species as 

 O. Pratti, and C. luciensis. But, on the other hand, if it should 

 eventually prove to differ from Cyatliophora generically, then the 

 genus Cryptocoenia must be dropped, and a new genus formed . to 

 receive the present species : for this, Depaphyllum would not be 

 an inappropriate name. 



EXPLANATION OF PLATE VII. 



Pig. 1. Bathy omnia Slatteri, the corallum, natural size. 



2. Cryptocoznia microphylla, two caliees, magnified. 



3. Cyatliophora Bourgueti, a young corallum, magnified, showing the 



position of the corallite3 in relation to each other. 



4. , a vertical section of a young corallum, showing the small 



quantity of dense coenenchyma and the tabulae inside the corallites. 

 The peculiarity in the septa is also shown in the figure. 



5. Oroseris Slatteri, a corallum, the natural size. 



6. Astroccenia Pkillipsi, the corallum, natural size. 

 7. , some caliees, magnified. 



8. Bathyccenia Slatteri, some caliees, magnified, showing the smooth cristi- 



forin septa and the mode of gemmation. 



9. Bathycoeniasolida, some caliees, magnified, showing the smooth cristiform 



septa. 

 10. , some caliees, seen from above, magnified. 



11. Montlivaltia caryopkyllafa, a septum, showing the lateral ornamenta- 



tion. 



12, 13. Enallohelia clavata, natural size. 

 14. , a calice, magnified. 



15. Conficsastrcea magnifica, the corallum, natural size. 



16. Favia pedunculata, the corallum, natural size. 



17. , two caliees, which have been recently formed by the fissi- 



parous division of a larger one, magnified. 

 18. 2'ricycloseris Umax, the corallum, natural size, seen from above. 

 19. , the corallum, natural size, seen from below. 



20. Montlivaltia Slatteri, a septum, showing the lateral ornamentation. 



21. Montlivaltia f airf or densis, a septum, showing the lateral ornamenta- 



tion. 



22. Confusastrcea magnifica, a septum, showing the lateral ornamentation. 



Discussion. 



The Chaikman (Dr. Gwyn Jeffreys) expressed his sense of the 

 value of the paper. He observed that most of these corals were com- 

 pound, and some of them especially peculiar to reefs, although 

 compound Madreporaria were found living as deep as 750 fathoms. 

 They, therefore, did not seem to very much elucidate the question 

 of the depth of the Mesozoic sea. Simple or solitary corals cer- 



Q.J.G.S. No. 154. p 



