Plate 145. 



Figs. 1-3. IJonicni luhcrom, new species (p. 800). 



1. Fragment of the erect branching zoariuni. natnral .size. 



2. Frontal of tlie .same specimen, X 2,5. 



3. Dorsal, X 2.5, exhibiting the numerous tuberosities. 



Upper Jaclvsonlan (Ocala lime.stone) : Chipola River, east of JIarianna, Jackson 

 Count.v, Florida. 



Cat. No. 65331, U.S.N.M. 

 Figs. 4-19. Homcra porosa Stoliczka, 18G2 (p. 800 i. 



4. Zoarial fragments, natural size. 



5. Frontal of young branch, X 12. 



6. Dorsal of adult branch, X 12. 



7. Very young branch, X 12. 



8. A branch with salient peristomes, X 25. 



9. Another branch, X 25, showing large, salient peristomes. 



10. Well preserved specimen, X 25, with little salient peristomes. 



11. Aspect of a worn branch, X 25. 



12. Dorsal showing small sulci, X 25. 



13. Normal aspect of dorsal, X 25. 



14. Specimen with wide nervl and very small sulci, X 25. 



15. Dorsal with small vacuoles, X 25. 



16. Transverse section of a branch, X 25, illustrating disposition of tubes and vacuoles on 



the frontal and vacuoles only on the dorsal. 



17. Tangential section through the dorsal, X 25. cutting the vacuoles. 

 IS. Thin section, X 100, showing scaly structure of the zoarial walls. 

 19. Tangential thin section of the dorsal, X 100. 



Vicksburglan (Marianna limestone) : One mile north of JloiiroeviUe, Alabama. 



Cat. No. 65332, U.S.N.M. 

 Middle .Tacksonian : Wilmington, North Carolina (figs 12, 14), and Rich Hill, Craw- 

 ford County, Georgia (fig. 8). 

 Cat Nos. 65478, 05479, U.S.N.M. 



146 



