PLATE 18 

 Pseudoepimastopora 



Figs, i, 2. Pseudoepimastopora ampullacea sp. nov. 1. Holotype, longitudinal section of 

 " waxing-and-waning " example, X30. V. 52089. 2. Paratype, random section of long 

 curved piece of thallus, X30. V. 52090. Permian, Zinnar Formation ; Ora, Mosul Liwa, 

 Iraq. 



Figs. 3, 4. Pseudoepimastopora cf. likana Kochansky and Herak. Fragments of wall- 

 material showing large distinctive pores, thin-sections, X30. Permian ; Jebel Qamar, 

 Peninsular Oman, Arabia. V. 52091, 52092. 



Figs. 5-7. P. ampullacea. 5, 6. Thin-sections of wall-fragments showing clearly the form 

 of the pores, x6o. V. 52093. 7. Transverse section, x6o. V. 52094. Permian, Zinnar 

 Formation ; Ora, Mosul Liwa, Iraq. 



