PLATE 4. 

 Fig. 1. 18. 1. Retepora incepta. (Pag. 15.) 



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



Fig. 2. 19. 2. Retepora gracilis. (Pag. 15.) 



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



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



3 a. Natural size of specimen. 



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



Fig. 4. 21. 1. Stictopoea fenestrata. (P^g- 16-) 



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

 4 ft. A portion magnified. 



4 c. 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 giowth. 



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



Fig. 6 a, i. 23. 1. Steeptelasma expansa. (Pag. 17.) 



Fig. 7. 24. 1. Chjetetes . (Pag. IS.) 



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



Fig. 8, 9. 25. 1. AcTiNocRiNus tenuiradiatus. (Pag. IS.) 



Fig. 10. -2^. 2. AcTiNocRiNTTs . (Pag. IS-) 



F'£r- 11- 27. 1. Asterias? . (Pag. 18.) 



U (I Natural size. 1 1 J. IWaffnified view 



