Plate 94. 



Figs. 1-11. Sniilliiin tiihiihiln r.uhU fiiiii Horn. lsfi2 (p. 470). 



1. Five of the liollinv, cyliudrical zoaria, narurnl siz<-. showinir vnri;iti(ins in form 



2. Porlion of another zo:\rium. X 20, with the mcrtinn avioularia visililo. 



3. Usual aspect of the zooecia, X 20, with scattered areolar pores. 



4. Surface of a young; zoarium. X 20. The areolae about each zooecinui are distinctly 



developed. 



5. A Ijranch, X 20. showing median avicularia, one zooecium with ovicell and the granu- 



lations of the pleurocyst. 



6. Strongly calcified specimen. X 20, showing zooecia separated by a salient ridge. 



7. Surface of a pluril.-mipllar zoarium. X 20. The zooecia are wide and arranged 



irregularly. 



8. Interior of frontal, X 20, with areolar pores and median avicularia visible. 



0. Transverse thin section of a plurilaniellar zo.-irium, X 20. Tliis and figure s show 

 the thickness of the zooecial frontal. 



10. Interior of frontal. X 20, where the lyrule is scarcely visible. 



11. Transverse section of a plurilainellar zoarium, X 10. 



Vicksburgian ("Chimney rock" of JIarianna limestone) : One mile north of Monroe- 

 ville, Alabama. 



Cat. No. G4302, U.S.X.M. 

 Figs. 12. 13. Rorella compacta, new species (p. 492). 



12. Fragment of the bllamellar zoarium. natural size. 



13. Surface of the same. X 20. The short, broad umbo is characteristic. 

 Vicksburgian (Byrani marl) : Byram. Jlississippi. 



Cat. No. 64.303, F.S.N.M. 

 Figs. 14-17. Porclhi cyHnfJricn. new species (p. 401). 



14. Fragments of the free, cylindrical zoarium, natural size. 



15, 16. Two fragments, X 20, with the structure of the tremocyst plainly visible. The front 

 view is shown in figure l.o and the profile view in figure 16. 

 17. Surface of a bifurcating zoarium. X 20. showing the large, median avicularium and 

 one zooeciuin with broken ovicell. 

 Vicksburgian ("Chimney rock" of Mariauna limestone) : One mile north of Mouroe- 

 ville, Alabama. 



Cat. No. 64304, U.S.X.M. 

 Fig. 18. Vmhoviila ceratomoiiilm Uims.s. 1S47 (p. 49.5). 

 Surface of the bllamellar zoarium. X 20. 



Vicksburgian (Glendon member of Mariauna limestone) : West bapk of Conecuh 

 River, Escambia County. Alabama. 

 Cat. No. 64305, U.S.N.JI. 

 Fig. 19. rnil>nnula miser, new species (p. 494). 

 Portion of the type-specimen, X 20. 



Vick.sburgian (Marianna limestone) : Salt .Mountain, five miles south of Jackson, 

 Alabama. 



Cat. No. 04306. T'.S.X.M. 



9.5 



