Plate 11. 



Figs. 1-C. Tioc/ioiiora truncata DeGregorio, 1890 di. 101). 



1. Four zoaria. natural size. 



2. Couvex celluliferous .side of an e.xaiuple. X 20, sliowing growth on a quartz graiu. 

 3,4. Views of the inner side of two zoaria. X 20. The radial rows are flat and smooth 



at the center and porous toward the circumference. 



5. A flat inner side of a zoarium. X 20, in which the pores are well developed. 



6. Inner side, X 20, showing the dislvs of which the zoarium is composed. 

 Chiiboruian (Gosport sand) : Claiborne, Alabama. 



Cat. No. 63S3S, U.S.X.M. 

 Figs. 7-10. OtioneUa perfo/'ata Canu and B:issler, 1917 (p. 106). 



7. Two fragments and two complete zoaria. natural size. 



S. Celluliferous surface, X 20, exhibiting the usual characters of the species. 

 9. Another zoarium, X 20. in which the anriculated vibracuUim and the oiiesial collar 

 are well developed. 



10. An entire discoidal zoarium, X 20. 



11. The inner face of a fragmentary flabelliform zoarium, X 20. 



12. Another fragment. X 20, showing centers of origin of new lines. 



13. An incomplete zoarium. X 20. The growth was flabelliform at first and then became 



discoidal. 

 14. 1.5. Inner face of two zoaria, X 20. Tlie rilis are broken at their extremit.y and the 

 pores of this face are well developed. 



16. Edge of the lines of zooecia, X 20. with minutely furrowed surface. 



17. Tangential thin section. X 100. illustrating the olocystal structure of the walls. 

 IS. Thin section. X 20, showing the structure of the cryptocyst. 



19. Transverse section, X 20, showing the tubules (t\ and the zooecia communicating 

 by a distal pore (sd). 

 Lower Jacksonian (Jloodys marl) : Jackson, Mississippi. 

 Cat. Xo. 02.571. U.S.X.M. 

 12 



