I'l.ATK 28. 



Fliis. 1-7. \l( iiihidiiiiinridrd siiissiiiii(i<ili'<. new siiccics (p. i:i(!). (See also Jil. 27.) 



1. 'J^iiiiieiiti.-il thin section, X 2(t. 



2. A |ii)rtion of the same. X 100, sliowinsr Ihe niur:il rim and cryptocyst foi-med of an 



oloeyst with elements gronpeil in rafli.-il lines. 



3. Tangential thin section of the dorsal wall, X KlO, formed of an oloeyst with scat- 



tered elements. 



4. Tangential thin section. X 20. exhibiting the thin zooecial wall. 



5. Sketch of tangential section, X 20. through thick zooecial walls, showing lateral and 



distal septnlae. 

 (1. Sketch of vertical section. X 2(1. tlirougli an ovicelled zooecinni. ol, ohx-yst ; or, 

 ovieell : .s. se|ptula ; c. zooeciiim. 



7. Fragments of the Ijifoliate zoariuni. natural size. 



Vicksbnrgiau (Marianna limestone) : Salt Xlonntain. five miles soiitli of .Tackson, 

 Alabama. 



Cat. Xo. 63011. r.S.N.M. 

 Fin.s. .S-10. Mciiibraiiiiioridra f:iiiiHifi. new species (p. 137). 



8. Surface of the incrnstiiig zoarinni, X 20, showing the finely granular ninr.il lim and 



the crennlated opesinm. 

 ITi)per .Tacksonian (OeaUi limestone) ; old Factory, near P.ainbridge, (ieorgia. 

 Cat. Xo. 63012, F.S.X.M. 



9. Anotlier exiunple. X 20. with several zooccia preserving ovicells. 



Vicksburgian ("Cliimney rock" of JInriamia limestone) : One mile north of Moiiroe- 

 ville, Alabama. 

 Cat. Xo. 63913. U.S.X.M. 



10. Surface of a small fragment, X 20. An interzooecial avicnlariuni is shown and the 



crenulatious of the opesium are well marked. 

 Jliddle .Tacksonian: Xear Lenuds Ferry, South Carolina. 

 Cat. Xo. 63914, U.S.X.M. 

 Figs. 11-13. Mciiihriiiiiporidrd piiriforniis, new species (p. 13s). 



11. A small fragment of the incrusting zoarium, X 20. The ]iyriform shape of the 



opesium and the small ovicell are to be obsen'ed. 



12. Another small fragment, X 20, exhibiting the thick walls of the nuiral rim. 

 T'pper Jacksonian (Ocala limestone) : Chipola River, east of Marianna. Florida. 



Cat. Xo. 0.3915. T^.S.X.M. 



13. Surface, X 20. slightly altered by fossilization. 



Fpper Jacksonian (Ocala limestone) : Kainbridge, C.eorgia. 

 Cat. Xo. 6.3910, U.S.X.M. 

 Fuis. 14-17. Mcmhrniiiporiilni iKirhaimirulis, new species (p. 134). 



14. The type-siiecimen. natural size, incrusting a Pecten. 



15. A portion of the type, X 20, with several ovicelled zooecia. The two component 



layers of the ovicell are visible. 



16. Jlore regular zooecia of the same zoarium. X 20. The very wi<le mural rim with 



radially arranged granules may be noted. 



17. Another portion of the type, X 20. with zooecia irregularly arranged. 

 Middle Jacksonian (Csistle Hayne limestone) : Wilmington, Xorth Carolina. 



Cat. No. 6.3017, U.S.X.M. 



29 



