EXPLANATION OF PLATES 

 Plate 1 



Figs. 1, 2. A plousina filum J nWien 1903 (p. 5). 



1. Portion of the incrusting zoarium, X 20, showing the small 



zooecia with ectocyst and the endozooecial ovicell. 



2. Surface of zoarium, X 20, with large zooecia covered by the 



ectocyst. The opercular valve is wide but very short. 

 Albatross Station D. 2813. 

 3-7. Membrendoecium claustracrassum, new species (p. 7). 



3. The incrusting zoarium, X 20, with little calcified zooecia 



in immediate contact with the substratum. 



4. Zooecia with ectocyst, X 20, showing the endozooecial 



structure of the ovicells. The zooecium without ectocyst 

 is regenerated. 



5. Ancestrular region, X 20. 



6. Ectocysted zooecia, X 20, showing the large operculum of 



the ovicelled zooecia and the small opercular valve of the 

 ordinary zooecia. 



7. Calcified zooecia, X 20, of the external lamella of an incrust- 



ing multilamellar colony. 



Albatross Station D. 2813. 

 8. Callopora verrucosa, new species (p. 9). 



Portion of the incrusting colony, X 20. The normal zooecia 

 are at the base. The marginal zooecia have zooeciules on 

 their mural rim. The marginal zooeciules have stopped 

 the growth of the colony. 



Albatross Station D. 2813. 

 9, 10. Cauloramphus brunea, new species (p. 10). 



9. Incrusting specimen, X 20, preserving the spines which are 



brown in the original. The pedunculated avicularia are 

 white. 



10. Ancestrular portion of a colony which has lost its spines, 



X 20. 



Albatrost^ Station D. 2815. 



62 



