Plate 15 



Figs. 1, 2. Steganoporella magnilabris Busk, 1854 (p. 144). 



1. Surface of a bilamellar example, X20. 



D. 5145. Jolo Light, Jolo. 



2. A specimen, X20, containing a large calcified cell. 



D. 5580. Darvel Bay, Borneo. 

 3, 4. Steganoporella mandibulata Harmer, 1926 (p. 145). 



3. Unilamellar specimen, X20, showing the ectocyst and avicularian 



mandibles. The thick ectocyst hides all the details of the frontal. 



4. The same specimen, X20, after boiling in Javelle water and deprived 



of the chitinous appendages. The polypidian tube is visible espe- 

 cially if the specimen is inclined 45 degrees. 

 D. 5174. Jolo Light, Jolo. 

 5-11. Cupularia umbellata Defrance, 1823 (p. 142). 



5. Central part of small colony, X20, where the zooecia are nol calcified. 



6. Center of large colony with calcified zooecia, X20. 



7. Marginal zooecia of a large colony, X20. 



8. Granulations of the inner side, X20. 



9. Inner side of a zoarimn, X20 showing three kinds of calcareous 



deposits. 



10. Tangential thin section through the inner side, X25. The pores 



serving for the passage of the hydrostatic muscles are visible. 



11. Tangential thin section through the outer side, > 25, showing the 



arrangement and structure of the spicules. 



D. 2826. Pacific, between California and Hawaii. 



(582) 



