EXPLANATION OF PLATE VIII. 

 Columnopora pauciseptata, Eth. Fil. 



Fig. 1. The corallum seen from above. 



,, 2. The same, from one side, showing superimposed colonies. 



„ 3. Three ealices exhibiting the septa. X 10. 



,, 4. A transvei-se section of several corallites, showing the thickened 

 walls, primary and secondary septa, and absence of pores of 

 communication. X 17. 



,, 5. A transverse section of a single corallite. X 30. 



„ 6. A transverse section of another corallite with the walls still more 

 thickened, and the septa club-shaped distally. X 30. 



„ 7. A vertical section of several corallites, exhibiting old visceral 

 chambers, thickened walls, and tabuljB. X 10. 



