PLATE 3 

 Broeckella, Clypeina 



Fig. i. Broeckella belgica Morellet, transverse thin-section, X50. Palaeocene ; Sahil 

 Maleh, Batinah Coast, Oman, Arabia. 



Figs. 2, 3. Clypeina jurassica Favre, thin-sections, X30. 2. Associated fragments ; above, 

 transverse (horizontal) section of broken verticil, showing radial tubules with example of 

 communicatory pore to stem-cell on right and distinctive thin-section appearance of adjacent 

 tubules in this species at top centre ; below, tangential-vertical cut of thick-walled tubules at 

 about mid-tubule zone radially. V. 52038. 3. Oblique-vertical cut of plant with successive 

 verticils in position ; the plane of section passes from central (below) to obliquely through 

 stem-cell wall and inner tubule-junction (middle) to outer tubules of third verticil. V. 52039. 

 Upper Jurassic, Najmah Formation ; subsurface, Kirkuk Well No. 117, Iraq. 



Fig. 4. C. jurassica, slightly oblique transverse cut through one verticil, x 30. Upper 

 Jurassic, Arab Zone ; subsurface, Dukhan No. 28 Well, Qatar, Arabia. V. 52040. 



Fig. 5. C. jurassica, transverse cut through one worn verticil, showing the resistant nature 

 of the calcification at the fusion between adjacent tubules, X30. Upper Jurassic, Najmah 

 Formation ; subsurface, Kirkuk Well No. 117, Iraq. V. 52041. 



