Plate 150. 



Figs. 1-6. Hrtcmtiora Oi«//.v. new specie.? (p. 082). 



1. Fragments of the branoliing- zoariuni, natural size. 



2. A brancii, X 12, sliowing tlie oval al^ertures and tlie numerous mesopores. 



3. Portion of figure 2, X 2.5. 



4. Another branch, X 12. 



5. Longitudinal thin section, X 25. The mesoiwres are very short. 



6. Transverse thin section, X 25. 



Lower Jacksonian (Mood.vs marl) ; .Tackson, JILssissippi. 

 Cat. No. 65371, U.S.N.M. 

 Figs. 7-10. Tretocijcloecia graniiis, new species (p. 827). 



7. Fragment of the c.vlindrical branched zoarium, natural size. 

 S. Surface, X 12. 



9. Surface, X 2.5, showing the liroken ovicell. 



10. Transverse section, X 20. 



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

 Cat. No. 65372, U.S.N.M. 

 Figs. 11-14. Partretnrycloecia rcptnns, new species (p. S."l). 



11. The iucrusting zoarium, natural size. 



12. Surface, X 12. 



13. A portion of figure 12, X 2.5. 



14. Ovicelled portion of the same specimen, X 12. 



Middle Jacksonian : Near Lenuds Ferry, South Carolina. 

 Cat. No. 65.373, U.S.N.^r. 



151 



