Plate 54 



Fin. 1. Cheiloporina irregularis, new species (p. 389). 



The unilamellar zoarium, X20, illustrating the irregularly arranged 

 zooecia. 



D. 514;'). Jolo Light, Jolo. 

 2-4. Cheiloporina caerulea, new species (p. 388). 



2. The incrusting zoarium, 20. The ovicell has the same structure as the 



frontal. 



D. 5102. Tinagta Island. 



3. Zooecia, > 20. in which the ovicell bears a frontal area.. 



D. 5147. Sulade Island. 



4. Nonovicelled zooecia, ■ 20, with finely granulose frontal and minute 



tremopores. 



D. 5151. Sirun Island. 

 5-7. Hippaliosina triforma, new species (p. 392). 



5. Incrusting zooecia, X20, showing the small ovicells. The special zooecia 



are regenerated in ordinary zooecia. 

 (I. An example, X20, showing the ordinary, ovicelled, and special zooecia. 

 7. Microscopic structure of the frontal, XS5. 

 D. 5147. Sulade Island. 

 8-11. Tremoschizodina crassa, new species (p. 389). 



S. Unilamellar ovicelled specimen, 20. The zooecia have very small 

 avicularia. 



D. 5579. Sibutu Island. 

 9. Group of small zooecia, X20, ornamented with avicularia. 



10. Interior of zooecia, X20. 



11. Marginal zooecia, and view of the zoarial border, X20. 



D. 5151. Sirun Island. 



(621) 



