230 MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 



Areoligera cf. senonensis Lejeune-Carpentier 

 PL 25, fig. 6 ; Text-fig. 64 



Description. One beautifully preserved individual from the London Clay of 

 Sheppey, whilst having the distinctive processes of A. senonensis, also possesses 

 process complexes on the ventral surface. The excellent preservation enabled the 

 tabulation of 6", 5'", ip, 1"" to be determined. The six precingulars bear soleate 

 process complexes, four of the postcingulars, 1'", 2'", 4'" and 5'" bear annular 

 complexes. The single antapical protuberance lies immediately beneath the sulcal 

 notch. 



A single archaeopyle operculum possessing four annular complexes can also be 

 attributed to A. cf. senonensis. This has an elongate plate 1', with plates 2' and 3' 

 considerably larger than the other two plates. 



Fig. 64. Areoligera cf. senonensis Lejeune-Carpentier. a, Tabulation of upper (ventral) 

 surface with processes omitted, b, Tabulation of lower (dorsal) surface seen through the 

 upper, c, An isolated operculum showing its tabulation. 



