Plate 55. 



Figs. 1-5. HniizcdiiiiuiTihrata. new species (p. 42.31. (See also plate 52, figs. 17, IS.) 



1. Fragment of tlie bilamellai- zoariuni, natural size. 



2. Surface of a zoarium, X 20. witli the median avicularium developed and the areolae 



widely spaced. 



3. Another zoarium, X 20, exhibiting two monstrous zooecia. 



4. An example, X 20, with the two lower areolae much developed and as usual in such 



eases, the avicularia wanting. 



5. Interior of zooecia, X 20, with the triangular avicularium visible. 



Middle Jaeksonian (Castle Hayue limestone) : Wilmington, North Carolina. 

 Cat. No. 64097, U.S.N.M. 

 Fig. 6. CycUcopora latirclUi, new species (p. 427). 



The incrustiug type-specimen. X 20. The zooecia are wide and the frontal is 



adorned with large tremopores. 

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

 Cat. No. 04112, U.S.N.M. 

 Fig. 7. Cyclicopora fissuraia, new species (p. 425). 



Surface of the unilamellar zoarium, X 20, showing the elongated zooecia with large 



tremopores and elongated thin avicularia. 

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

 Cat. No. 64113, U.S.N.M. 

 Figs. 8-11. Mctnidoliiiiii Uihratuhim, new species (p. 441). 



8. Two examples of the narrow bilamellar zoariuni, natural size. 



9. Zooec^ia, X 20, with the enormous muoro bearing at its base a spiramen. Several 



zooecia have an avicularium and then the spiramen is replaced by a rimule. 



10. Another zoarium, X 20, having some zooecia with lateral rimule and avicularium 



and others with spiramen. 

 Middle Jaeksonian: One-half mile southeast of Georgia Kaolin Company's mine, 

 Twiggs County, Georgia. 

 ■ Cat. No. 04114, U.S.N.M. 



11. A fragment. X 20, in which most of the zooecia have the spiramen placed below 



a large lamellate mucro. 

 Middle Jaeksonian: Eighteen miles west of Wrightsville, Georgia. 

 Cat. No. 64115, U.S.N.M. 

 Figs. 12-14. Metradoliiim grande, new species (p. 445). 



12. The narrow, bilamellar zoarium, natural size. 



13. Zooecia with the avicularia exterior, X 20. The rimule-spiramen is well formed. 

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



Cat. No. 64116, U.S.N.M. 



14. An old zoarium. X 20, in which the avicularium is within the peristomie. The rimule 



spiramen is deep and irregular. 

 Middle Jaeksonian : Eutaw Springs, South Carolina. 

 Cat. No. 64117, U.S.N.M. 

 Figs. 15-20. MctrudoUuin parvirimulatnm, new species (p. 443). 



15. Three fragments, natural size. 



16. An example, X 20, with zooecia having a very small rimule spiramen and normal 



avicularium. 



17. Another specimen, X 20, exhibiting mainly zooecia with spiramen only. A few 



of the zooecia have a small avicularium. 



18. Zooecia with spiramen and no avicularia. X 20, illustrating their arrangement in 



groups. 



19. A zoarium, X 20, in which the principal avicularium is very large. 



20. A specimen, X 6, having ordinary zooecia with rimule spiramen at the base and 



zooecia with spiramen in the upper part. 

 Middle Jaeksonian: Near Lenuds Ferry, South Carolina. 

 Cat. No. 64118, U.S.N.M. 

 56 



