Plate 51 



Figs. 1-13. Adeonella minutipora, new species (p. 379). 



1. The free bilamellar fronds, natural size. 



2. Terminal zooecia of a young frond, X20, showing the union of the 



aperture and the spiramen. 



3. Branching part of frond, X20, showing the large zoarial avicularia. 



4. Interior of a very young frond, X20, showing the union of the aper- 



ture and the spiramen. 



5. Superior portion of a frond, X20, exhibiting both descending and 



ascending frontal avicularia. 



6. Marginal zooecia, X20. 



7. Zooecia at a bifurcation, X20, illustrating similarity to the marginal 



zooecia. 



8. Frond, X20, bearing much calcified zooecia without salient avicularia. 



9. Zooecia, X20, bearing three or four irregularly placed avicularia. 



10. Zooecia, X20 with two oral subsymmetrical avicularia. 



11. Longitudinal section, X20, showing the position of the spiramen and 



the great thickness of the frontal. 



12. Transverse section, X20. 



13. Tangential thin section, X85. 



D. 5151. Sirun Island (fig. 1); D. 5579. Darvel Bay, Borneo 

 (figs. 6, 8); D. 5137. Join Light, Jolo (figs. 2-5, 7, 9, 13). 



(618) 



