Plate 27. 



Figs. 1-10. ifeniiianiitoridni xiii.tsiiiiiiroli.'i, new species (p. ]:{ti). (Si^e also pi. 28, figs. 1-7.) 



1.2. Surface of the bifoliate zoariuiu, X 20, showing the most perfect, but less common 

 form of the .species. 

 Middle Jacksoniau (Castle Ha.vue liiiu-stone) : Wilmington, North Carolina. 

 Cat. No. 0300.5, U.S.N.M. 



3. Zooecia, X 20, one with smooth ovicell. 



Middle Jacksoniau : Rich Hill, Crawford County, Georgia. 

 Cat. No. 03906, U.S.N.M. 



4. Zooecia, X 20, with the cryptocyst lacking the lateral groove. 



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

 Cat. No. 0300.5. U.S.N.M. 



5. Zooecia, X 20, exhibiting a concave cryptocyst. 



Vicksburgiaii ("Chimney rock" of Marianna limestone): 1 mile north of Monroe- 

 ville, Alabama. 



Cat. No. ()3907, U.S.N.M. 



6. Zooecia, X 20, with convex cryptocyst. 



7. The same variation as figure 6, X 20, with ovicells. 

 Middle .lacksonian : 3i miles south of Perry, Georgia. 



Cat. No. 6390S, U.S.N.M. 



8. Surface of a zoarium, X 2(i. in whicli the cryptocyst is wanting and the lateral 



denticles are developed. 

 Vicksburgian (" Chinniey rock" of Marianna limestone): 1 mile north of Monroe- 

 ville, Alabama. 



Cat. No. 63007, U.S.N.M. 



9. A fragment, X 20, with most of the zooecia supplied with ovicells. 



10. Aspect of a weathered zoarium, X 20. 



Middle Jacksoniau : Rich Hill, Crawford County, (Jeorgia. 

 Cat. No. (53900. U.S.N.M. 



11. An example. X 20. showing zooecia with tliiu mural rim. 



12. Fragment, X 20, with the ovicells exhibiting the callosity developed in the Vicks- 



burgian specimens. 



13. Young zooecia, X 20. with denticles developed. 



■Vick.sburgian (Gleudon member of Marianna limestone) : West bank Conecuh River, 

 Kscambia County, Alabama. 

 Cat. No. 03909, U.S.N.M. 



14. An example, X 20, with monstrous zooecia and a regenerated zooecium. 

 Vicksburgian ('•Chiuuiey rock" of Mariauiui limestone): 1 mile north of Monroe- 



ville, Alabama. 



Cat. No. 63907, U.S.N.M. 

 1.5. A fragment. X 20, with a zooecium giving ri.se to five primoserial zooecia. 

 Middle Jacksoniau : Rich Hill, Crawford County, Georgia. 

 Cat. No. (53906, U.S.N.M. 



16. Surface, X 20, with the granulations of the mural rim enlarged by chemical action. 



The ovicell is oruamented with a frontal callosity. 

 Viclcsburgiau (Marianna limestone) : near Claiborne, Monroe County, Alabama. 

 Cat. No. (j.3910, U.S.N.M. 



17. A variation of the Vicksburgian variety, X 20, showing the frontal callosity of the 



ovicell. 



15. Another aspect of tlie zoarium, X 20, with very large lateral opesial denticles. 

 Vicksburgian (JIarianna limestone): Salt Mountain, five miles .south of Jackson 



Alabama. 



Cat. No. 63911, U.S.N.M. 

 19. Dorsal side of a unilamellar zoarium, X 20. 



Vicksburgian (("Jleudon member of Mariaima limestone) : West bank, Conecuh River. 

 Escambia Count.v, Alabama. 

 Cat. No. 63909, U.S.N.M. 

 28 



/"^^ 



