AND CAINOZOIC DINOFLAGELLATE CYSTS " 5 



Cymatiosphaera membranacea (Philippot) Davey & Williams, comb, nov., 



= Hystrichosphaeridium membranaceum Philippot, 1949 ; 57-8, text-fig. 3. 



Upper Cretaceous, France. (Acritarch). 

 }Hystrichokolpoma xiphea (Maier) Davey & Williams, comb, nov., =Galea 



xiphea Maier 1959 ; 309, pi. 30 fig. 5 (transferred to Hystrichosphaeridium by 



Sarjeant, 1964 ; 176). Oligocene, Germany. 

 Hystrichosphaera leptoderma (Maier) Davey & Williams, comb, nov., = Hystri- 

 chosphaeridium leptodermum Maier, 1959 ; 321-2, pi. 33 figs. 5-6. Oligocene, 



Germany. 

 Oligosphaeridium albertense (Pocock) Davey & Williams, comb, nov., =Hystri- 



chosphaeridium albertense Pocock, 1962 ; 82, pi. 15 figs. 226-7. Lower 



Cretaceous, Alberta, Canada. 

 ? Oligosphaeridium asterigerum (Gocht) Davey & Williams, comb, nov., 



= Hystrichosphaeridium asterigerum Gocht, 1959 ; 67-8, pis. 3 fig. 1, 7 figs. 1-3. 



Lower Cretaceous, Germany. 

 ? Oligosphaeridium coelenteratum (Tasch) Davey & Williams, comb, nov., 



= Hystrichosphaeridium coelenteratum Tasch in Tasch, McClure & Oftedahl, 



1964 ; 195, pi. 2 fig. 11. Lower Cretaceous, Kansas, U.S.A. 

 Oligosphaeridium dictyophorum (Cookson and Eisenack) Davey & Williams, 



comb. nov.. = Hystrichosphaeridium dictyophorum Cookson & Eisenack, 1958 ; 



44, pi. 11 fig. 14. Upper Jurassic, Papua. 

 ^Oligosphaeridium dispare (Tasch) Davey & Williams, comb, nov., =Hystri- 



chosphaeridium dispare Tasch in Tasch, McClure & Oftedahl, 1964 ; 195, pi. 2 



fig. 8. Lower Cretaceous, Kansas, U.S.A. 



^Oligosphaeridium irregular e (Pocock) Davey & Williams, comb, nov., = Hystri- 

 chosphaeridium irregulare Pocock, 1962 ; 82-3, pi. 15 figs. 228-9, non Hystri- 

 chosphaeridium irregular e (Merrill) Sarjeant, 1964. [The holotype of this 

 latter species, originally described (as ?Geodia irregularis) from the Middle 

 Cretaceous of Texas, U.S.A., is lost ; it is considered to be a junior synonym 

 of Hystrichosphaeridium complex (White, 1842) Deflandre, 1946b, by Sarjeant, 

 1966a ; 8]. Lower Cretaceous, Alberta, Canada. 



? Oligosphaeridium paradoxum (Brosius) Davey & Williams, comb, nov., 



= Hystrichosphaeridium paradoxum Brosius, 1963 ; 41-2, pi. 4 fig. 6, text-fig. 



2, nos. ia-c. Oligocene, Germany. 

 Oligosphaeridium perforatum (Gocht) Davey & Williams, comb, nov., =Hystri- 



chosphaeridium perforatum Gocht, 1959 ; 68-9, pis. 3 fig. 7 ; 7 figs. 13-16. 



Lower Cretaceous, Germany. 

 }Litosphaeridium crassipes (Reade) Davey & Williams, comb, nov., —Xanthi- 



dium crassipes Reade, 1839 '< pi- 9 fig s - 2 ~5- (Transferred to Hystrichos- 



phaeridium by Lejeune-Carpentier, 1941 ; 79-80). Upper Cretaceous, England. 

 }Litosphaeridium flosculus (Deflandre) Davey & Williams, comb, nov., =Hystri- 



chosphaeridium flosculus Deflandre, 1937 ; 75-6, pi. 15 figs. 5-6. Upper 



Cretaceous, France. 



