Plate 109. 



Figs. 1-9. Tretoci/clocciu ? uttenuata Ulrich, 1882 (p. 826). 



1. Examples of the solid, cylindrical zoarium, natural size. 



2. Specimen, X 12, exliibiting a brol^en ovicell. 



3, 4. Rounded extremity of a branch, X 12 and X 25. There is no zone of growth. 



5. Branched zoarium, X 12. Tliere are a few mesopores. 



6. Portion of fig. 5, X 25. 



7. Longitudinal thin section, X 20. The mesopores are short and few. 



8. Transverse thin section, X 20. Tlie walls of the mesopores are vesicular. 



9. Tangential thin section, X 20. The mesopores are few. 



Midwayan (Clayton limestone) : Jlabelvale, near Little Rock, Arkansas. 

 Cat. No. 652.56, U.S.N.M. 

 Figs. 10-12. Mecynoecia luvernensis, new species (p. 727). 

 10. Two fragments, natural size. 

 11, 12. Celluliferous sides of the same specimens, X 12. 



Midwayan (Clayton limestone) : Luverne, Crenshaw County, Alabama. 

 Cat. No. 6.5257, U.S.N.M. 

 Figs. 13. 14. PUifiioccin hniiididgeiisis, new species (p. 711). 



13. The incrusting zoarium, X 12, showing the very convex short ovicell at the upper left 



corner. 



14. Portion, X 2.5. The tubes are small and distinct. 

 Midwayan (Clayton limestone) : Well at Brundidge, Alabama. 



Cat. No. 65258, U.S.N.M. 

 110 



