Plate 141. 



Figs. 1^. Crisia hijrnesi Reuss, 1S47 (p. 704). 



1. 2. Dorsal and frontal, X 25, of two segments referred to this European species. 

 3, 4. Two ovicelled segments, X 2.5. 



Jacksonian (Jloodys marl) : Jackson, Jlississippi. 

 Cat. No. 65336, U.S.N.M. 

 Figs. 5-7. Crista edicardsi Reuss. 1847 (p. 705). 

 5, 7. Portions of two segments, X 25. 

 6. Dorsal of a segment, X 25. 



Middle Jacksonian: Near Lenuds Feny, South Carolina. 

 Cat. No. 65337, U.S.N.M. 

 Fig. S. Crisia luivei.' new si)ecies (p. 706). 

 A short ovicelled segment, X 25. 



Lower Jacksonian (Moodys marl) : Jackson, Jlississippi. 

 Cat. No. 65388, U.S.N.M. 

 Figs. 9-11. Crisia crihraria Stimpson, 1853 (p. 706). 



9, 10. Dorsal and frontal of two incomplete segments, X 25. 



11. A complete segment, X 25. 



Lower Jacksonian (Moodys marl) : Jackson, Mississippi. . 

 Cat. No. 6.5339, U.S.N.M. 

 Figs. 12-19. Plntonen liniicllifcrn. new species (p. 760 1. 



12. Fragments of the idmoneiform zoariuni, natural size. 



13. Large zoariuni, X 12. 



14. Fragment with margin of growth, X 12. 



15. Ovicelled zoarium, X 12. 



16. Young zoarium, X 12. 



17. An example with basal lamella altered chemically, X 12 ; the tubes are visible. 



18. Dorsal showing the radicular lamellae, X 12. 



19. The basal lamella is worn and the tubes are visible and free, X 12. 



Lower Jacksonian : Three and one-half miles southeast of Shell Bluff Post Office, 

 Georgia. 



Cat. No. 65340, U.S.N.M. 

 Figs. 20-27. Tretonea levis, new species (p. 769). 



20. Zoarial fragments, natural size. 



21, 22. Lateral view of a fragment, X 12 and X 25. 



23. Frontal view, X 12. 



24. Dorsal of the zoarium, X 12. 



25. Dorsal with pores in quincunx, X 12. 



26. Branch with ovicell occupying the upper portion, X 12. 



27. Triangular transverse section. X 2.5. 



Lower Jacksonian: Three and one-half miles southeast of Shell Bluff Post Office, 

 Georgia. 



Cat. No. 65341, U.S.N.M. 

 Figs. 28-33. Polyascosoeeia imbrirnta. new species (p. 840). 



28. Anterior face, X 12. 



29. Dorsal or posterior face, X 12. 



30. Lateral face, X 12. The proximal lip of the peristome is raised. 



31. Transverse section in the vicinity of a bifurcation, X 25. 



32. Longitudinal section, X 25. 



33. Fragments, natural size. 



Lower Jacksonian (Moodys marl) : Jackson, Mississippi. 

 Cat. No. 65342, U.S.N.M. 

 142 



