Plate 43. 



Figs. 1-9. Idinonea aiUfornka D'Orbigny, 1S52. (p. 199.) 



1. Zoarial fragments, natural size. 



2. Colluliferous side, X 12, sliowing the axial zooecia isolated and closed by a diaphragm. 



3. Posterior side, X 12, illustrating the transverse striations. 



4. Another example, X 12, in which the axial zooecia are open. 



5. A portion of figure 2, X 25. 



6. An ovicelled specimen, X 6. 



7. Transverse thin section, X 12. The tubes are polygonal. 



8. Longitudinal thin section, X 12. . . 



9. Tangential thin section, X 100. The mural perforations are no larger than m smaller species 



of the genus. 



Pleistocene: Santa Barbara, California. 

 Figs. 10-17. Slathmepora fiahellalu, new species, (p. 201.) 



10 Zoarial fragments, natural size. , 



11. A rather complete flabellate specimen, X 12, with incomplete fascicles, 

 l*? A frao-ment X 12, showing bifurcated fascicles. 



i. ii:S:;Lt!;S::'Seii Xl^, iUustratlng that the peristomes are here adjacent in 



15. An ovicelled example, X 12, with a large basal lamella. 



Pleistocene; Santa Barbara, California. 



Ifi \ n-ibellate example, X 12, -ivith a tliick zone of growth. 



l': tStudtatsecTon, X 25. The tubes are cylindrical with triparietal gemmation. L. B.= 



basal lamella. 

 Pleistocene; Rustic Canyon, Santa Momca, California. 

 FiG'^ 18 19. Diaperoecia flabellala, new species, (p. 202.) 



18. The flabellate bilamellar zoarium, X 12, .vith an o^•lcell developed. 



19. Portion of the same, X 25. 



Plesitocene: Rustic Canyon, Santa Monica, Calilorma. ^^^ 



