PLATE 4. 



Fig. 1. 18. 1. Retepoka incepta. (Pag- 15.) 



1 a. Specimen of the natural size. 1 b. An enlarged portion of the same. 



Fig. 2. 19. 2. Rktepora gracilis. (Fag- 15.) 



2 a. Natural size of the fragment. 2 b. Enlarged portion, showing the form of the fenestrules. 



Fig. 3. 20. 1. Gorgonia? A8PEEA. (Pag. 16.) 



3 a. Natural size of specimen. 



3 b. Portion enlarged, showing the rough surface of the coral, and the form of the fenestrules. 



Fig. 4. 21. 1. StICTOPOEA FENESTRATA. ( Pag. 16.) 



4 a. Natural size of the branches of this coral. 

 4 i. A portion magnified. 



4 e. A fragment of another specimen from a different locality. 

 4 d. Portion of the same magnified. 



4 e. A part of the axis of a specimen, denuded of the outer crust, and presenting a series of concentric lines 

 corresponding to the lines of progressive growth. 



Fig. 5. 22. 2. Stictopora glomerata. (Pag- 17.) 



Fig. 6 a, J. 23. 1. Streptelasma expansa. (Pag. 17.) 



Fig. 7. • 24. 1. Chjetetes . (Pag. 18.) 



7 a, b, e. The specimens considerably magnified. 7 d. The ends of the tubes magnified. 



Fig. 8, 9. 25. 1. AcTiNocRiNUs tenuiradiatus. (Pag. 18.) 



Fig. 10. 26. 2. AcTiNOCRiNus -. (Png. 18.) 



P'g- 11- 27. 1. AsTERUs? . . (Pag. 18.) 



U a. Natural size. 116. Magnified riew. 



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