Plate 3S. 

 Fi<;s. ]-7. f^m ill ina discoi'ka, new species, (p. lir>.) 



1. Fragments of the unilamellar zoarium. natural size. 



2. Surface, X 20, showing the large interzooecial avicularium. 



3. Zooecial surface, X 20, with the large aA-icularium replaced by two small ones. Ovicelled 

 zooecia are present. 



4. Lower side, X 20. 



5. Another surface, X 20, in which the huge avicularium is unguiculate. 

 fi. Zooecia, X 20, with the large avicularia turned in different directions. 



7. Interior of zooecia, X 20, showing that the lyrula is accompanied by two cardelles. 



Pleistocene: Rustic Canyon, Santa Monica, California. 

 Fid. 8. Cystisella aviciilifcra, new species, (p. 1.52.) 



Portion of the incrusting zoarium, X 20, showing the small ancestrular zooecia and the large 

 marginal ones. 



Pleistocene: Santa Barbara, California. 

 Fig. i). Sinittina pori/eraB.inc'ka, ISSi. (p. 147.) 



Zooecia of the incrusting zoarium, X 20, showing the convex frontal perforateil by pores. 



Pleistocene: Santa Monica, California. 

 Fics. 10-15. Porella collifcra Robertson, 1908. (p. 148.) 



10. Zoaria, natural size. 



11. Ovicelled zooecia, X 20. 



12. Surface, X 20, with one zooecium bearing a small ovicell. 



13. Zooecia, X 20, with a very salient peristome. 

 Pleistocene: Santa Monica, California. 



14. Zooecia, X 20, with large tremopores. 



15. Interior of zooecia, X 20. The oral avicularium is supported by a denticulated lyrula. 

 Pleistocene: Santa P.arbara, California. 



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