MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 175 



B. saturnium (Maier 1959) Downie & Sarjeant 1963. Miocene ; Germany. 



B. seminudum (W. Wetzel 1952) Downie & Sarjeant 1963. Paleocene (Danian) ; 

 Baltic. 



B. spiculatum (White 1844) Downie & Sarjeant 1963. Upper Cretaceous ; 

 England. 



B. stimuliferum (Deflandre 1938) Sarjeant 1960c. Upper Jurassic ; France. 



B. sylheti (Baksi 1963) Downie & Sarjeant 1964. Eocene ; Assam, India. 



B. telmaticum Churchill & Sarjeant 1963. Quaternary ; Australia. 



B. tinglewoodense Churchill & Sarjeant 1963. Quaternary, Australia. 



B. varispinosurn Sarjeant 1959. Middle Jurassic ; England. 



B. whitei (Deflandre & Courteville 1939) Downie & Sarjeant 1963. Upper Creta- 

 ceous ; France. 



It is apparent, from illustrations and descriptions, that the bulk of these species 

 will be demonstrated in the future also to be the cysts of dinoflagellates ; acritarchs 

 appear relatively infrequent after the Palaeozoic. Five of the species listed are 

 freshwater forms from the Australian Quaternary ; a restudy of their taxonomy is in 

 progress. 



