Plate 38. 
Figs. 1-7. Smitlina discoidea, new species, (p. 145.) 
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 avicularium replaced by two small ones. Ovicelled 
zooecia are present. 
4. Lower side, X 20. 
5. Another surface, X 20, in which the large avicularium is unguiculate. 
6. 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. 
Fig. 8. Cystisella aviculifera, new species, (p. 152.) 
Portion of the incrusting zoarium, X 20, showing the small ancestrular zooecia and the large 
marginal ones. 
Pleistocene: Santa Barbara, California. 
Fig. 9. Smittina pori/era Hincks, 1884. (p. 147.) 
Zooecia of the incrusting zoarium, X 20, showing the convex frontal perforated by pores. 
Pleistocene: Santa Monica, California. 
Figs. 10-15. Porella colli/era 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 Barbara, California. 
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