Plate 55 



Figs. 1-4. Hippaliosina acutirostris, new species (p. 391). 



1. Ovicelled portion of the incrusting zoarium, X20. 



D. 5147. Sulade Island. 



2. Ordinary zooecia, X20, showing the sharp-pointed avicularia. 



3. Transverse section of a trilamellar zoarium, X20. 



4. Microscopic structure of the frontal, XS5. The granulations of the 



pleurocyst are hollow and appear white in tangential section. 

 D. 5145. Jolo Light, Jolo. 



5. Lagenipora perforata, new species (p. 406). 

 Surface of unilamellar specimen, X20. 



D. 5579. Darvel Bay, Borneo. 

 6-10. Tetraplaria gryllus, new species (p. 395). 



6. Segments of the articulated zoarium, natural size. 



7. Small segment with very narrow base, X20. 

 S. Ovicelled segment, X20. 



9. An example, X20, showing the articulation of two segments covered 



by the ectocyst. 

 10. Microscopic structure of the frontal, X85. 

 D. 5478. Tacbuc Point, Leyte. 

 11, 12. Parmularia elongata, new species (p. 402). 



Two views of the surface, X20, of the irregularly lobed bilamellar 

 segment showing the elongate zooecia. 

 D. 5162. Tinagta Island. 

 13. Parmularia depressa, new species (p. 402). 



Axial portion of the bilamellar zoarial segment, X20. exhibiting the 

 depressed frontal. 



D. 5574. Simaluc Island. 



(622) 



