Plate 7S. 

 FIGS 1-17 KlrulhncUa mnnli.. r.nu and Bnsslev, WIT (p. GIT). (See also plate 79, fig. 1.) 



1-G. Various forms of the large bifurcated fronds, natural size. .,,ip„Hria and 



7 Surface of zoarium, X 20. iu whicb mnuy of the large mterzooecial aMCulaua and 



the small frontal avicularia have undergone regeneration. 

 S Portion of zoarium, X 20, illustrating both deep and superficial zooecia. 



9. In example X 20, with several incomplete zooecia, and illustrating a group of large 



10. A.rher'portion of the same specin.en shown in figure 0, X 20, but exlulnting r 

 group of small zooecia. 

 Jacksonian (Zeuglodon zone) : Cocoa Post Office, Choctaw County, Alabama. 



Cat. No. 62013, TI.S.N.M. 

 11 A zoarium, X 10, showing groups of large and of small zooecia. _ 

 Middle Jacksonian: Three and one-half miles soutli of Perry, Georgia. 

 O'lt No 64^*^5 U S N M 

 12 13 Views of the zoarial siu-face, X 20, shewing two aspects of the zooecia and avicularia^ 

 14. LoTgitudinal section, X 20, exhibiting the two inner rows of oriented zooecia and the 



many rows of cumulate zooecia. 

 15 TransC-erse section of a frond, X 20. The oriented zooecia are seen on each side 

 of the middle line, followed by numerous rows of cumulate zooeeia. 



10. A deep tangential thin section, X 20. . 



17 Interior of orieuted zooecia, X 20. The oval form of the apertu.a is visible. 



Lower Jacksonian (Jloodys marl) : Jackson. Mississippi. 



Cat. No. 64226, U.S.N.M. 



79 . 



