Plate 139. 



Figs. 1-13. hlinoiieu petri D'Arehiuc, 1S16 (p. 7S1). 



1. Fragments of the zoarium, natural size. 



2. Branch seen In profile, X 12. At the top is au incomplete ovlcell. 



3. Fragment showing concave dorsal side, X 12. 



4. Portion of figure 2. X 2.3. 



5. Basal, claviform liranch, X 12. 



6. Portion of a branch at a bifurcation, X 12. 



7. A claviform branch witli fascicles arranged alternately, X 12. 

 Vicksburgian : West bank Conecuh River, Escambia County, Alabama. 



Cat. No. 6535.5, U.S.N.M. 

 S. A branch with 4 to 6 tubes to the fascicle, X 12. 

 9. A branch with 8 tubes to tlie fascicle. X 12. 

 10. Dorsal showing the concave basal lamella, X 12. 

 11, 12. Normal transverse sections, X 25. 



13. Vertical section, X 25. 



Middle Jacksonian : Eutaw Springs, South Carolina. 

 Cat. No. 65356, U.S.N.M. 

 Figs. 14-22. Erkosonca admoUi. new species (p. 764). (See also Plate 133, fig. 8.) 



14. Several fragments, natural size, sliowing bifurcation. 



15. Frontal of a bifurcated specimen, X 12. 



16. A narrow branch, X 12, sliowing convexity of the tubes. 



17. Dorsal of a branch with radicular lamellae, X 12. 



18. Normal transverse section, X 25. 



19. Dorsal exhibiting dactylethrae, X 12. 



20. Branch witli radicular lamella, X 12. 



Middle .Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina. 

 Cat. No. 65357, U.S.N.M. 



21. Dorsal, X 25, sliowing dactylethrae with .salient walls. 



22. Longitudinal section, X 25. 



Upper Jacksonian (Ocala limestone) : West bank Sepulga River, Escambia County, 

 Alabama. 

 140 



