PLATE 15 



Gonaylacysta fetchamense sp. nov. 

 Fig. 1. Ventral surface of holotype, PF.3046(i). X500. 

 Fig. 2. Dorsal surface of same, viewed by transparency. X500. 

 Leptodinium alectrolophum sp. nov. 

 Fig. 3. Ventral surface of paratype, V. 51725(1). X500. 

 Fig. 4. Dorsal surface of same, viewed by transparency. X500. 

 Fig. 5. Oblique view of dorsal surface of holotype, V. 51735(1). x 500. 

 Fig. 6. Oblique view by transparency of the ventral surface of same. X500. 



Meiourogonyaulax valensii gen. et sp. nov. 

 Fig. 7. Ventral surface of holotype. B.S.60 (Laboratoire de Micropaleontologie, Ecole 

 Pratique des Hautes Etudes, Paris) . Photo, by Prof. G. Deflandre, reproduced by his permission. 

 Xc.700. 



Gonyaulacysta helicoidea (Eisenack & Cookson) 

 Fig. 8. Specimen, V.5i728(i), in oblique ventral view. X 500. 

 Fig. 9. The same specimen, in oblique dorsal view, by transparency. X 500. 



