PLATE 6 

 Cylindroporella 



Figs, i, 2. Cylindroporella arabica Elliott, longitudinal and transverse thin-sections, X58. 

 Upper Jurassic, " Arab Zone " ; subsurface, Dukhan No. 28 Well, Qatar, Arabia. V. 41629. 



Figs. 3,4. Cylindroporella barnesi Johnson. 3. Random oblique section, X30. Cretaceous, 

 Valanginian-Hauterivian, Garagu Formation ; subsurface, Makhul No. 2 Well, Mosul Liwa, 

 Iraq. V. 52051. 4. Random tangential section, x6o. Cretaceous, about Aptian level, 

 Sarmord Formation ; Sekhaniyan, Surdash, Sulemania Liwa, Iraq. V. 52052. 



Figs. 5-7. Cylindroporella sugdeni Elliott. 5. Longitudinal section, X35. V. 52053. 

 6. Transverse section, X28. V. 41623. 7. Tangential section, X28. V. 41620. Lower 

 Cretaceous ; subsurface, Fahud No. 1 Well, Oman, Arabia. 



