Plate 44. 



Fuis. 1-3. Lichenopora hispida Fleming, 1828. (p. 203.) 



1. Several zoaria, natural size. 



2. An example, X 12, illustrating that the fascicles do not reach the zoarial margin. 



3. An o^icelled example, X 12, -with the ovicell not entirely covered by the cancelli and show- 

 ing no oeciopore. 



Pleistocene: Santa Barbara, California. 

 Fic.s. 4-7. Lichenopora californiai Conrad, 1855. (p. 203.) 



4. Zoaria, natural size. 



5. An ovicelled example, X 12. The oeciostome is located between two fascicles. 



6. Another o\-icelled example, X 12. ^showing clearly the salient oeciostome and the ovicell 

 covered with cancelli. 



7. Inferior side of a discoid, free example, X 12. 

 Pleistocene: Santa Barbara, California. 



Figs. 8-9. Lichenopora verrucaria Fabricius, 1780. (p. 205.) 



Celluliferous surfaces of two ovicelled examples, X 12, referred to this recent species. 



Pleistocene: Rustic Canyon, Santa Monica, California. 

 Fk;. 10. Lichenopora radiala Sa\'i.gny-Andouin, 1826. (p. 204.) 



An incomplete although typical zoarium of this -wide spread recent species, X 12. The cancelli 

 are larger than the zooecial orifices. 



Pleistocene: Rustic Canyon, Santa Monica, California. 

 Figs. 11-21. Psilosolen capitiferar, Canu and Bassler, 1922. (p. 207.) 



11. A longitudinal thin section, X 25. 



12. A longitudinal section showing the ovicell at the end of the branch, X 12. 



13. Longitudinal thin section through a bifurcated branch, X 25. The tubes are cylindrical and 

 ramify at all heights. 



14, 15. Transverse thin sections, X 25. 



IG. An example, X 12, illustrating the irregular quincunx arrangement of the peristomes. 



17. An example, X 12, with the peristomes arranged in zones. 



18. A portion of the same zoarial surface, X 25, illustrating that the tubes are visible and the 

 peristome thin. 



19. An ordinary transverse section, X 25. 



20. 21. Ovicelled specimens, X 12, illustrating the position of the ovicell at the flattened end of 

 the branch. 



Pleistocene: Santa Barbara, California. 

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