MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 



regulare sp. n. 

 Other Species 

 Genus Homotryblium nov. 



Homotvyblium tenuispinosum sp. n 

 pallidum sp. n. 

 Genus Callaiosphaeridium nov. . 



Callaiosphaeridium asymmetricum (Deflandre & Courteville) 

 Other Species hitherto placed in Hystrichosphaeridium 

 Conclusions ....... 



VI. DINOFLAGELLATE CYSTS WITH GONYAULAX TYPE TABULATION 



(W. A. S. Sarjeant) .... 

 Introduction ..... 



A. Genera with precingular archaeopyle 

 Genus Gonyaulacysta Deflandre . 



Gonyaulacysta gongylos sp. n. . 

 palla sp. n. 

 axicerastes sp. n. 

 helicoidea (Eisenack & Cookson) 

 episoma sp. n. . 

 hadra sp. n. 

 orthoceras (Eisenack) 

 aichmetes sp. n. 



cassidata (Eisenack & Cookson) 

 whitei sp. n. 

 fetchamensis sp. n. 

 Other Species 

 Genus Acanthogonyaulax nov. 

 Genus Heslertonia nov. 



Heslertonia heslertonensis (Neale & Sarjeant) 

 Genus Leptodinium Klement 



Leptodinium alectrolophum sp. n. 

 Other Species .... 



Genus Raphidodinium Deflandre 

 Genus Psaligonyaulux nov. 



Psaligonyaulax deflandrei sp. n. 

 Other Species .... 



Genus Hystrichosphaeropsis Deflandre 

 Genus Carpodinium Cookson & Eisenack 

 Genus Rhynchodiniopsis Deflandre 

 Genus Hystrichodinium Deflandre 

 Hystrickodinium pulchrum Deflandre 

 Other Species .... 



Genus Heliodinium Alberti 

 Heliodinium voigti Alberti 



patriciae Neale & Sarjeant 



B. Genera with apical archaeopyle 

 Genus Meiourogonyaulax nov. 



Meiourogonyaulax valensii sp. n. 



Other Species .... 



Genus Xiphophovidium nov. 



Xiphophoridium alatum (Cookson & Eisenack) 

 Genus Belodinium Cookson & Eisenack 



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