Plate I. 



Page 

 Fig. i. Tcdania suctoria O. Schmidt. The large papilla is an oscular papilla. t / 1 i 



— 2. Tedania suctoria O. Schmidt. A branched specimen, partly incrusting a Ptilota. 1 j 1 — 



— 3. Tedania suctoria O. Schmidt. Incrusting specimen on an Altopora. I / I ■ — 



— 4. Tedania suctoria O. Schmidt. Pore-papilla in longitudinal Section, x about 30 — 



— 5. Tedania suctoria O. Schmidt. Oscular papilla in longitudinal section, viewed from inwards, 



x about 30 — 



— 6. Histoderma appendiculatum Cart. Most fistulas broken off, one ending in the way mentioned 



in the text. 1 / I 7 



7. Histoderma appendiculatum Cart. Small specimen. I / 1 — 



— 8. Histoderma appendiculatum Cart. Section showing the small incurrent canals radiating 



inwards from the space below the dermal layer, and some larger, excurrent canals. I / 1 — 



9. Histoderma appendiculatum Cart. The inner body, removed from the dermal layer, 



showing the openings of the incurrent canals, seen translucently as dark points. 2 / I . — 



— 10. Histoderma appendiculatum Cart. A piece of the surface of the inner body at the base 



of a fistula, showing the fibres at the surface, running together towards the base of 

 the fistula, x 32 — 



• 



— n. Histoderma appendiculatum Cart. End of a pore-fistula, x about 20 — 



— 12. Histoderma physa O.Schmidt, groving 011 a stone; the specimen has two oscular tubes. 1 / 1 11 



— 13. Histoderma physa O. Schmidt. Oscular tube with pore-sieve on the side, x about 3.... — 



