Plate 3G. , 



Figs. 1-C. Floriiliiia hiniinciilii. now spocios (ji. 22;'. I. 



1. Portion of the free, uiiilaniellar zoariimi, X 25, sliowiug various coiulitious of the 



hiteral processes and the oi>esiules. 



2. Zooecia of another surface, X 25. 



3. Basal side of zoariuni, X 20, with the hydrostatic tuberosities quite visible. 



4. A small fragment, X 20, with the lateral process so reduced that the opesiules are 



quite visible. 



5. Tangential thin section, X 20, e.xhibiting the very thin zooecial walls. 



6. View of the interior of the frontal, X 20, showing the trifoliate opesiuni. 

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



Cat. No. C39S5, U.S.N.M. 

 Flos. 7. S. Duel i/oiicU<( minor, new species (p. 2.S2). 



7. A portion of the small, bifurcated, bifoliate zoarium, X 20, with some of the zooecia 



showing the polypidian convexity. 

 S. Another small zoarium, X 20, in which the avicularia are fairly well developed. 



Upper Jacksonian (Ocala limestone) : Chiiwla River, east of Marianna, Jaclison 

 County, Florida. 

 Cat. No. 639S6, U.S.N.M. 

 Fics. f)-20. Uacrijoiiclhi nctanaiUt Canu and Rassler, 1017 (p. 231). 



9. An example of the incrusting zoarium, formed of numerous layers piled ou top of each 



other, natural size. 



10. Edge of zoarium, X 20, sliowing broad zooecia. 



11. Transversal thin section of a large expanded frond, X 20. 



12. Normally developed zooecia, X 20. 



13. Another zoarium, X 25, in which a number of the zooecia exhibit ovicells. 



14. Transversal section of a zoarium with narrow fronds. 



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

 Cat. No. G25S4, TT.S.N.M. 



15. Zoarial lamella, sliowing the progrissive increase of the zooecial size in tlie direction 



of the exterior margins. 

 Upiier Jacksonian (Ocala limestone) : lied liUift' on Flint Kiver, 7 miles above Bain- 

 bridge, Georgia. 



Cat. No. 639S7, U.S.N.M. 



16. Exterior lamella with reduced zooecia, X 20. 



Upper Jacksonian (Ocala limestone) : Chipola Rivei-, east of Marianna, Jackson 

 County, Florida. 



Cat. No. 63988, U.S.N.M. 



17. Exterior lamella with deformed zooecia, X 20. 



18. View of zoarium, X 20, showing distorted zooecia. 

 Middle Jacksonian: 3i miles north of Grovania, Georgia. 



Cat. No. 63989, U.S.N.M. 



19. Tangential thin section, X 20, exhibiting the rounded avicularian cavities and the 



olocystal structure of the wall. 



20. Basal side of zoarium, X 20, with the hydrostatic porous tuberosities quite visible. 

 Middle Jacksonian i Castle Hayne limestone): Wilmington, North Carolina. 



Cat. No. 63900, U.S.N.M. 



37 



