Plate 72 



Figs. 1—11. Flabellopora irregularis, new species (p. 502). 



1. Two examples, natural size, of the irregular zoaria. 



2. Surface, X20, of a regular amygdaloidal specimen. 



3. Inferior angle of initial base of the same zoarium, X20. 



4. Terminal angle of the same zoarium, X20. 



5. Interior of zooecia, X20. The exterior pores penetrate obliquely in 



the thick calcareous frontal and are always interzooecial. At the 

 base the aperture is visible at the bottom of the cells and there 

 are no interzooecial pores; the latter are visible only at the top 

 where the section is made in the vicinity of the aperture. These 

 exterior pores have then little depth. 

 D. 5144. Jolo Light, Jolo. 



6. Surface of an irregular zoarium, X20. Some zooecia are covered by 



their ectocysl . 



7. Zooecia of another zoarium, X 20. The apertures and the avicularia 



are placed in a hexagon. There is a large special aperture. 

 D. 5311. China Sea, vicinity of Hong Kong. 



8. Portion of a small narrow lamellar colony, X20. The avicularia 



have lost their pivots. 



9. An irregular small zoarial lamella, X 20, showing the arrangement of 



pores between the zooecia. 



D. 5579. Darvel Bay, Borneo. 



10. Portion of a large, irregular, much-calcified frond, X20, showing 



the immersed apertures. 



D. 5311. China Sea, vicinity of Hong Kong. 



11. Lateral view of an irregular lamellar specimen, X20. 



D. 5144. Jolo Light, Jolo. 



12. Flabellopora arculifera, new species (p. 501). 

 The free lamellar zoarium, natural size and X20. 



D. 5579. Darvel Bay, Borneo. 

 (639) 



