Plate 86 



Figs. 1-10. Hornera pinnata, new species (p. 550). 



1. Zoarial fragments, natural size and branch, X12, with equally 



spaced pinnules. 



2. Portion of the same, X25. 



3. Extremity of a branch, X12, with pinnules unequally spaced. 



D. 5151. Sirun Island. 



4. View of the dorsal of young branch of a large colony, X25. Longi- 



tudinal ridges limit the sulci. 



D. 5579. Sibutu Island, Darvel Bay, Borneo. 



5. Base of a colony, X6, showing mode of attachment to the sub- 



stratum. 

 6-9. Different views of the ovicell, X 12. In Figure 8, the ovicell is 

 carinated and the vacuoles are separated by strong ridges. 



10. Portion of the base, X25, showing its epithecal structure with sulci 



and nervules. 



D. 5151. Sirun Island. 

 11-13. Mesonea simplex, new species (p. 549). 



11. Anterior side of the bifurcated zoarium, X12, showing the fascicles 



formed by a single tube. 



12. Zoarial fragment natural size and an adventitious branch, X25, 



reinforced exteriority. 



13. Dorsal, X12, showing the oblique arrangement of the sulci and the 



small vacuoles. 



D 5151. Sirun Island. 



(653) 



