Plate 137. 



Figs. 1-13. Idmoiira iictri D'Arohiae, 1S46 (p. 781). 

 •1. Zoarial fragments, natural size. 



2. Branch witli tran.sverse fascicles, X 12. 



Middle Jacksonian : Three and one-quarter miles south of Perry, Georgia. 

 Cat. No. 65346, U.S.N.M. 



3. Lateral face of a branch, X 12, with 4 or 5 tubes to the fascicles. 



4. Branch of a reticulate zoarium, X 12, with fascicles joined. 



Jacksonian (Zeuglodon bed) : South side of Suck Creek, Clarke Count.v, Mississippi. 

 Cat. No. 65347, U.S.N.M. 

 5, 0. Branch with convex basal lamella. X 12 and X 25. 

 7. Specimen showing 4 or 5 tubes to the fascicle, X 12. 



5. Basal lamella of a branch, X 12. concave below and convex above. 

 Lower Jacksonian (Mood.vs marl) : Jaclsson, Mississippi. 



Cat. No. 6.5348, U.S.N.M. 

 9. An example with 7 or S tubes to the fascicle, X 12. 



10. Zoariura with concave basal lamella. Tlie thick zone of growth is visible. 



11. Longitudinal section, X 12. 



Jacksonian (Zeuglodon bed) : Shuljuta, ilississippi. 

 Cat. No. 65.349, U.S.N.M. 



12. Longitudinal thin section, X 12. 



13. Tangential section of the dorsal, X ItX). 



14. Tangential section of the dorsal, X 25, after the removal of the basal lamella. 



15. View of the interior obtained b.v the ablation of the basal lamella. X 12. 



16. Transverse .section through the fascicles, X 25. 



17. Transverse section between the fascicles, X 25. 



18. Cross section of a branch. X 12. 



Middle .Jacksonian : Rich Hill. 51 miles southeast of Knoxville, Georgia. 

 Cat. No. 6.5350, U.S.N.M. 

 138 



