MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS 209 



Fromea amphora Cookson & Eisenack 

 PL 22, fig. 4 ; PL 23, fig. 3 



1958. Fromea amphora Cookson & Eisenack : 56, pi. 5, figs. 10, 11. 

 1961. Fromea amphora Cookson & Eisenack ; Alberti : 23, pi. 12, fig. 13. 

 ?ig6i. Chrysomonadiniae? Maliavkina et al., pi. 52, figs. 1-5. 



Remarks. This species, originally described from somewhat higher horizons in 

 Australia, has been recorded by Alberti from the Upper Barremian of Germany and 

 occurs at this level in the Shell West Heslerton Borehole (at 19-25 metres depth). 

 The figured specimens, B.M.(N.H.) slide ¥.51732(1, 2), are of closely similar size, 

 respectively measuring 84 x 49fx and 84 x 50[x, the apex being lacking ; this is 

 within the range quoted for the Australian specimens (62-95^ x 47-81^) and larger 

 than that quoted for the German specimens (58-66(1, x 49-52(1) . 



The shell surface is minutely granular in these specimens ; there is little indication 

 of a cingulum. 



The specimens figured by Maliavkina et al. (1961, pi. 52, figs. 1-5), from the 

 Maestrichtian of Siberia, may be examples of Fromea amphora, but are rather small. 



Genus SYSTEMATOPHORA Element i960 : 61 



Type species. S. areolata Klement i960. Upper Jurassic (Kimmeridgian) ; 

 Germany. 



Systematophora schindewolfi (Alberti) 

 PL 22, fig. 5 



1 961. Hystrichosphaerina schindewolfi Alberti : 38, pi. 10, figs. 1-3, 6, 7. 



1962. Systematophora schindewolfi (Alberti) Neale & Sarjeant : 455 (by implication). 



Remarks. This species, originally described from the Cretaceous (Upper Bar- 

 remian to PSenonian) of Germany, has been encountered only in the horizon from 

 42-5 metres depth in the Shell West Heslerton Borehole (Middle Barremian). The 

 majority of examples are too obscured or badly positioned for study, but one 

 specimen, B.M.(N.H.) slide V. 517121(1), was excellently preserved and favourably 

 orientated. Its dimensions (overall length 1200., breadth ii2fji ; shell length 65jx, 

 breadth 6o[j.) accord with those quoted by Alberti (shell length 58-70(1 ; length of 

 appendages 22-39(1). 



Study showed that the distribution of the annular process complexes on epitract 

 and hypotract, and the linear equatorial complexes, was precisely that specified for 

 the genus by Klement. 



Genus GARDODINIUM Alberti 1961 : 18 



Type species. Gardodinium eisenacki Alberti 1961. Lower Cretaceous (L. 

 Hauterivian to Aptian) ; Germany. 



