Plate 25 



Page 

 Figs. 1-6. Holoporella subalba, new species 146 



1. Two examples of the unilamellar zoarium, natural size. 



2. Surface, X 20, showing large interopesial avicularia. 



3. Portion of a colony, X 20, with giant zooecia and also 



buried zooecia. 



4. Surface, X 20, with erect zooecia and small denticulated 



interzooecial avicularia. 



5. Surface with ectocyst, X 20, preserving an ovicelled 



zooecium. 



6. Cumulate zooecia, X 20, illustrating formation of the 



ovicell. 

 Albatross Station D. 2362, east of Yucatan. 

 7-14. Holoporella vagans Busk, 1885 __ 148 



7. Surface, X 20, with large avicularia. 



8. Group of little erect superficial zooecia, X 20. 



9. Inferior side of the unilamellar colony, X 20. 



10. Young colony showing the ancestrula, X 20. 

 Albatross Station D. 2639. 



11. A group of large superficial zooecia, X 20. 



12. Surface with small zooecia and interzooecial avicu- 



laria, X 20. 



13. Cential part of discoid zoarium, X 20. 



14. Interior of zooecia, X 20, illustrating form of the 



aperture. 

 Fowey Light, 15 miles south of Miami, Fla. 



190 



