AND CAINOZOIC DINOFLAGELLATE CYSTS " n 



Gonyaulacysta pyra (Drugg) Sarjeant, comb, nov., =Gonyaulax pyra Drugg, 



1967 ; 14, pi. 1 fig. 17, pi. 9 figs. 6a-b. Upper Cretaceous-Paleocene, California, 



U.S.A. 

 Gonyaulacysta sarjeanti (Vozzhennikova) Sarjeant, comb, nov., =Gonyaulax 



sarjeanti Vozzhennikova, 1967 ; 87-8, pi. 31, figs. 1-3. Upper Jurassic, 



U.S.S.R. 

 Gonyaulacysta scarburghensis Sarjeant, 1964 ; 472-3 (=Gonyaulax areolata 



Sarjeant, 1961a ; 95-7, pi. 13 fig. 13, text-fig. 5, nom. nud.). Upper Jurassic, 



England. 

 Gonyaulacysta scotti (Cookson & Eisenack) Sarjeant, comb, nov., =Gonyaulax 



scotti Cookson & Eisenack, 1958 ; 30, pi. 2 figs. 5-6. Upper Jurassic, 



Australia. 

 Gonyaulacysta serrata (Cookson & Eisenack) Sarjeant, comb, nov., =Gonyaulax 



serrata Cookson & Eisenack, 1958 ; 34, pi. 3 fig. 2, text-figs. 12-14. Upper 



Jurassic-Lower Cretaceous, Papua. 

 ? Gonyaulacysta tenuiceras (Eisenack) Sarjeant, comb, nov., =Gonyaulax 



tenuiceras Eisenack, 1958 ; 389-91, pi. 21 figs. 14-15, pi. 22 figs. 1-3, pi. 24 



fig. 2, text-figs. 4-5. Lower Cretaceous, Germany. 

 Gonyaulacysta tenuicornuta (Cookson & Eisenack) Sarjeant, comb, nov., 



= ? Leptodinium tenuicornutum Cookson & Eisenack, 1962 ; 478, pi. 3 figs. 



12-13, text-fig. ia, b. PLower Cretaceous, Australia. 

 Gonyaulacysta tenuitabulata (Gerlach) Sarjeant, comb, nov., =Gonyaulax 



tenuitabulata Gerlach, 1961 ; 159-61, pi. 25 figs. 10-11, text-figs. 1-3. Oligo- 



cene-Miocene, Germany. 

 "i Gonyaulacysta transparens (Sarjeant) Sarjeant, comb, nov., =Gonyaulax 



transparent Sarjeant, 1959 ; 334-5, pi. 13 fig. 3, text-fig. 3. Middle Jurassic 



England. 

 Gonyaulacysta tvetzeli (Lejeune-Carpentier) Sarjeant, comb, nov., =Gonyaulax 



wetzeli Lejeune-Carpentier, 1939 ; 525-9, text-figs. 1-2. Upper Cretaceous, 



Germany. 

 Gonyaulacysta whitei Sarjeant, 1966b ; 126-8, pi. 14 fig. 2, text-fig. 32. Upper 



Cretaceous, England. 



Genus LEPTODINIUM Klement i960 

 emend. Wall 1967, emend. 

 i960 Leptodinium gen. nov. Klement : 45. 



1965 Leptodinium Klement ; Norris & Sarjeant : 37. 



1966 Leptodinium Klement ; Loeblich & Loeblich : 38. 

 1966b Leptodinium Klement ; emend. Sarjeant : 133-4. 



1967 Leptodinium Klement ; emend. Wall : 104. 



Emended diagnosis. Proximate dinoflagellate cysts, spheroidal, ovoidal, ellip- 

 soidal or polyhedral, with reflected tabulation 3-4', o-ia, 6", 6c, 5-6'", ip, 0-1 p. v., 

 1"", o-x s. Apical, median and antapical horns lacking. Cingulum strongly or 

 weakly helicoid, laevorotatory ; cingular plates well or poorly marked. Sulcus 

 generally but not constantly extending onto epitract, undivided or subdivided into 



