Plate 91. 



Figs. 1-11. Eiioiiloxtninclla crussiinuralU-, new species (p. ^35). 



1. Three frairiiieuts of the hollow, cylindrical zoariuru, natural size. 



2. Surface of zoarium, X 20, with the zooecia separated bj- thick, smooth walls. 



3. Zooecia of another zoarium, X 20, Illustrating the irregularity of the tremopores. 



4. Zooecia, X 20, with prominent avicularia. 



5. Zooecia, of young portion of zoarium, X 20. The tremoiwres are here smaller and 



more regular in size, and the rimule-spiramen and avicularium are quite apparent. 



6. Interior of frontal of zooecia, X 25. showing regular arrangement of the zooecia., 



tlie avicularian cavity and the oloeyst with minute pores 



7. Another interior, X 20, in which the avicularian cavities are not seen. 



8. Tangential thin section through the frontal, showing the obscure remains of the 



tremopores and the fusion of the zooecial walls. 



9. Transverse fracture of a zoarium, X 20. showing no special zooecial walls. 



10. Transverse thin section of a branch, X 20. The tubules are scarcely visible in the 



dense structure. 



11. Tangential thin section, X 20, below the frontal. 



A'icksburgian (Mariauna limestone) : Salt Mountain, 5 miles south of Jackson, 

 Alabama. 



Cat. Xo. 64293, U.S.N.M. 

 Figs. 12-21. EnuiilostniiiflUi (Irfi-ia Canu and Bassler, l'.>17 (p. 436). 



12. Group of the small, free cylindrical zoaria. natural size. 



13. A zoarium, X 20, exhibiting short avicularia. 



14. Zooecia, X 20, with small numerous tremopores and well developed avicularia. 



15. Ovicelled zooecia, X 20, with salient avicularia. 



16. Another zoarium, X 20, in which the avicularium is long and salient. The zooecia 



are bordered by a salient thread. 



17. Portion of a thick zoarium, X 20, with worn avicularia. 



IS. Another zoarium with worn avicularia and attenuated tremopores, X 20. 



19. Transverse fracture of a branch, X 20. 



20. Interior of frontal of zooecia, X 20. 



21. Tangential thin section tlirough the frontal, X 100. The lateral tremopores only are 



seen, while between them the section cuts the olocyst. 

 Vicksburgian ("Chimney rock" of Mariauna limestone) : One mile north of Monroe- 

 ville, Alabama. 



Cat. No. 62594, IT.S.X.M. 

 Figs. 22, 23. LrioselUi orhicuhiria. new species (p. 4.j0). 



22. Fragment of the free, cylindrical bifoliate zoarium. natural size. 



23. Surface of the same .specimen, X 20. The frontal is a smooth, thick olocyst, the 



pores exhibited being small frontal avicularia. 

 Vicksburgian (Red Bluff member) : Red Bluff, Wayne County, Mississippi. 

 Cat. No. 64294, U.S.N.M. 



92 



