MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 211 



The archaeopyle is situated on the upper flanks of the epitract, in a position 

 corresponding to the intercalary archaeopyle described by Evitt (1961c, text-fig. 7). 

 The tabulation pattern was not sufficiently clear, however, to permit certainty as to 

 whether the archaeopyle corresponded in position to an intercalary plate ; it is 

 equally possible to visualize formation by loss of the equivalent of the anterior part 

 only of a precingular plate. 



Remarks. Alberti (1961) recorded this form from the Lower Cretaceous (Upper 

 Barremian) of Germany and commented that it probably constituted a new species. 

 It occurs in the Lower Barremian horizons of the Speeton Clay (at 39 metres and 42- 5 

 metres depth), but has not to date been encountered in the Upper Barremian. 



The generic allocation is made, following Alberti, on the basis of the tuberculate 

 structure of the inner body ; however, a tabulation is typically absent in Dingo- 

 dinium. It was not possible to determine the plate pattern in detail, but there 

 proved to be some similarity to the pattern exhibited in Scriniodinium subgenus 

 Endoscrinium Klement 1960c, to which the species is thus possibly referable. 



In the relative shapes of outer shell and inner body and in the ornamentation of the 

 inner body ? Dingodinium albertii sp. nov. differs from all other described species. 



Genus PAREODINIA Deflandre 1947 : 4 



Type species. Pareodinia ceratophora Deflandre 1947. Middle Jurassic ; 

 France. 



Pareodinia ceratophora Deflandre 



PI. 23, fig. 2 



1947. Pareodinia ceratophora Deflandre : 4, text-figs. 1-3. 

 1958. Pareodinia aphelia (para) Cookson & Eisenack : 60, pi. 12, fig. 9. 



1958. Cryptomeriapollenites coralliensis Lantz (nom. nud.) : 927, pi. 5, figs. 55-56, pi. 6, fig. 7. 

 1958. Incertae sedis, Lantz : 927, pi. 6, figs. 58-59. 

 19606. Pareodinia ceratophora Deflandre ; Sarjeant, pi. 12, fig. 11. 

 1961a. Pareodinia ceratophora Deflandre ; Sarjeant : 99, pi. 13, fig. 16. 

 1 961. Pareodinia ceratophora Deflandre ; Alberti : 23, pi. 12, fig. 14. 

 1961. Peridinea (?) Maliavkina, Samoilovitch et al., pi. 16, figs, i, ?2. 

 1961. Pareodinia sp., Evitt, pi. 8, fig. 19. 



1962a. Pareodinia ceratophora Deflandre ; Sarjeant : 263, pi. 1, fig. 13. 

 19626. Pareodinia certophora Deflandre ; Sarjeant : 483, pi. 69, fig. 8 ; text-fig. 5. 

 1963. Pareodinia ceratophora Deflandre ; Baltes : 584, pi. 4, fig. 7 (mis-spelt P. cerathophora 

 in text). 



Remarks. This species, first described from the Middle Jurassic, is known to occur 

 also in the Upper Jurassic. Cookson & Eisenack (1958) embraced within their 

 species Pareodinia aphelia, from the Upper Jurassic to Lower Cretaceous of Australia, 

 what they recognized as two distinct morphological entities ; one of these (type 2) 

 corresponds exactly with Pareodinia ceratophora. In the Speeton Clay, this species 

 is represented by a handful of specimens in the Hauterivian and Barremian horizons ; 

 in the absence of any other evidence of reworking these must be presumed to be 



