PLATE III. 



Fig- 



1. Calophyllum Donatianum, King. Twice the natural size. Humbleton Hill. 



2. Petraia profunda, Germar. Thrice the natural size. The dotted line gives a 



restored outline of the lower half. Humbleton Hill. 



3. Calamopora Mackrothii, Geinitz. Thrice the natural size. Tunstall Hill. 



'4. — — Highly-magnified figure of the tube-apertures, and the 



denticulated dissepiments. 



5. — — Longitudinal section,- twice the natural size, showing casts 



of the tubes. Humbleton Hill. 



6. — — Highly-magnified view of a section of the tubes, showing 



transverse plates {a), and mural foramina {b). Tunstall 

 Hill. 



7. Stenopora columnaris, SMotkeim. Figure (thrice the natural size) of a specimen 



incrusting some encrinal intemodes. The tubes are 

 in the state of casts. Tunstall Hill. 



8. — — Magnified view of a specimen, showing mature tubes (a), 



and new tubes {b) originating from the sides of the 

 former. Humbleton Hill. 



9. — — Specimen (natural size) incrusting some encrinal internodes. 



Humbleton Hill. 



10. Alveolites Buchiana, Kinc/. Nearly twice the natural size. Humbleton Hill. 



11. — — Highly-magnified figure showing the tube-apertures {a), and 



tuberculated dissepiments {b). 



12. — — Diagram showing tubes. 



13. Aulopora Voigtiana, King. Thrice the natural size. Humbleton Hill. 



14. Synocladia virgulacea, Phillips. Natural size. Humbleton Hill. 



