Plate 39. 



Figs. 1-7. Phi-hlopora pncifica Robertson 1908. (p. Ibi.) 



1. Zoarial fragments, natural size. 



2. Cellulit'erous side of fragment, X 20, with the frontal aviciilarium well developed. 



3. Another fragment, X 20, in which the frontal avicularium is absent or worn away. 



4. Tangential thin section of the dorsal, X 25, illustrating the special calcification of the vibices. 



5. View of the interior of the zooecia, X 20. ap, apertura; pic, peristomie; rf, dietelJae. 



6. Dorsal side of zoarium, X 20, showing some radicular pores and an avicularium. 



7. Transverse thin section, X 25. 



Pleistocene: Rustic Canyon, Santa Monica, ('alifornia. 

 Figs. S, 9. Phi/IacteUa spinosissima, var. major Hincks, 1884. (p. 170.) 



8. Zooecia of the incrustiug zoarium, X 20, showing the recumbent ovicell. 



9. A specimen, X 20, ^^^th zooecia exhibiting the spines, oral mucro, and the tremopores. 

 Pleistocene: Long Wharf Canyon, Santa Monica, California. 



Figs. 10-12. Costa^zia rohertsonuie, new species, (p. 181.) 



10. Zoaria, natural size. 



11. Surface of the globular zoarium, X 20, with ovicelled zooecia and interzooecial avicularia. 



12. Another surface, X 20, showing incomplgte zooecia. 

 Pleistocene: Rustic Canyon, Santa Monica, California. 



Figs. 13-17. Phidolopora labiata Gabb and Horn, 18G2. (p. 154.) 



13. The reticulated zoarium, natural size. 



14. Cellulit'erous surface, X20, showing zooecia with large salient avicularia. 



15. A fragment, X 20, with ovicelled zooecia. 



16. Dorsal side of a fragment, X 20, illustrating the irregular vilnces. 



17. Another fragment, X 20, with the zooecia distinctly outlined by a salient thread. 

 Pleistocene: Santa Barbara, California. 



283 



