Plate 22 



Page 

 Figs. 1-4. Hippoporidra edax Busk, 1859 139 



1. Zoarium, natural size, encrusting a gastropod. 



2. Portion of large zoarium, X 20, with large interzooecial 



avicularia. 



3. Ovicelled portion of a zoarium with marginal zooecia; 



X 20. 



4. Group of cells with very salient umbo; X 20. 

 Albatross Station D. 2363, east of Yucatan. 



5-6. Hippoporidra calcarea Smitt, 1873 140 



5. Two zoaria, natural size, incrusting gastropods. 



6. Zooecia, X 20, showing the large characteristic avicu- 



laria. 

 Albatross Station D. 2387, Gulf of Mexico. 

 7-9. Schizmopor a dichotoma Hincks, 1864 149 



7. View of colony, natural size. 



8. Group of ovicelled zooecia; X 20. 



9. Portion of the same zoarium; X 20. 

 Albatross Station D. 2405, Gulf of Mexico. 



10, 11. Holopo7-ella albirostris Smitt, 1873 142 



10. Unilamellar specimen, with large very salient super- 



ficial zooecia; X 20. 



11. Inferior face of the same specimen, X 20. 

 Albatross Stalion D. 2405, Gulf of Mexico. 



187, 



