Plate 26 



Page 

 Figs. 1,2. Callopora tenuissima, new species 34 



1. Surface of the incrusting zoarium, X 20, showing ovi- 



celled zooecia. 



2. Ovicelled and ordinary zooecia, X 20. The avicularia 



are developed in the interior of the zooecia with 

 aborted polypide. 

 Albatross Station D. 2387, between Florida and New 

 Orleans. 

 3-13. Mamillopora cupula Smitt, 1873 153 



3. The small discoid zoaria, natural size. 



4. Zooecia with noncarinated ovicells, X 20. 



5. Surface, X 20, showing the thick peristome cover Al 



with small mammillosities. 



6. Inner side, X 20, showing radial ribs. 



7. Inner side, X 20, illustrating the helicoidal arrange- 



ment of the avicularia. 



8. Median section, X 20. There is no substratum for 



the larva. 



9. Lateral view, X 20, of the marginal ovicelled zooecia 



of Figure 10. 



10. Marginal ovicelled zooecia, X 20. 



11. Zooecia with carinated ovicells, X 20. 



12. Ancestrular part of colony, X 20. 



13. Interior of zooecia, X 20. The avicularia are peii- 



stomial and not visible. 

 Albatross Station D. 2411. Gulf of Mexico and Fowey 

 Light, 15 miles south of Miami, Fla. 



191 



