Pr-ATE 111. 



Figs. 1-4. Hctcroiiora (ijreolata, new siiecies (p. 6S2). 



1. Tlie massive zoarium with cylinclrieal branches, natural size. 



2. A fjiindrical brancli, X 12. / 



3. Longitudinal tliin section, X 25. 



4. Portion of a transverse tliin section, X 25. 



Michva.van (Cla.vton limestone) : Mabelvale, near Little Rock, Arkansas. 

 Cat. No. 652.54, U.S.N.M. 

 Figs. 5-10. Ceiiopora rcsiculnsn, new species (p. 071)). 



5. The massive zoarium, natural size. 



6. Surface, X 25. 



7. Tangential thin section, X 25. 



S. Portion of a transverse thin section, X 2.5. Tlie walls of the tubes are vesicular. 

 9. Portion of another transverse section, X 2.5. 



10. Lougituilinal thin section, X 25, of tlie t.vpe specimen composed of many superposed 

 layers altliough not separated. 

 Midwayan (Clayton limestone) : JIaljelvale. near Little Rock, Arkansas. 

 Cat. Xo. 65255, U.S.N.M. 

 112 



