Plate 3 



Figs. 1, 2. Micropnrella gibbosula, new species (p. 20). 



1. Incrusting specimen, X 20, showing the micrometric varia- 



tions from the ancestrula to the marginal zooecia. 



2. Ovicelled specimen much calcified, X 20. The form of the 



avicularia is altered by the intensity of calcification. 

 Albatross Station D. 2813. 

 3-5. Microporella tradabilis, new species (p. 22). 



3. Incrusting zoarium with ovicelled zooecia, X 20. The ovicells 



have the same structure as the frontal. 



4. An example with setiform avicularian mandibles, X 20. The 



point of the latter touches the pivot of the avicularium of 

 the adjacent superior zooecium. 



5. Structure of the frontal, shown by transparency, X 85. The 



ascopore is large and triangular. 

 Albatross Station D. 2815. 

 6-11. Enantiosula manica, new species (p. 23). 



6,6.^ Two colonies, natural size, shov/ing their real position. 



7. Surface, X 20, showing young zooecia with tubular tremo- 

 pores. 



8. Fragment of a lamella, X 20, on which the tremocyst is 



much calcified and the frontal tubules are adjacent. 



9. Portion of a transverse section of a colony, X 10, showing 

 the superposed concentric lamellae. 



10. Margin of a lamella, X 20, illustrating the parietal dietellae 



formed before the frontal and the aperture. The avicularia 

 are visible among the dietellae. 



11. End of a branch, X 20. The cells are much calcified and 



unadorned. The tremopores are closed by costules. 

 Albatross Station D. 2815. 



64 



