136 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



different from the holotype of White and is not related to G. stuarti (de Lapparent) ; 

 it needs to be renamed and redescribed in more detail. 



Hofker (1956ft : 322-324) described as Marginotruncana stuarti (de Lapparent) 

 a form which is entirely different from Globotruncana stuarti as described and figured 

 by de Lapparent. He considered the holotype of G. stuarti (de Lapparent) as a 

 Marginotruncana (a junior synonym of Globotruncana Cushman as mentioned above), 

 and tried to distinguish between Marginotruncana stuarti (de Lapparent) and 

 Globotruncana stuarti of authors, stating that the form belonging to the genus 

 Globotruncana (in his sense) should not be called stuarti. He also added, without 

 any obvious reason, that the European specimens are Marginotruncana stuarti 

 (de Lapparent), while those from Palestine, Egypt, Trinidad and Texas belong to 

 a different genus (in his own sense, meaning the genus Globotruncana). However, 

 as can be seen from his figures, Hofker's Marginotruncana stuarti is probably G. 

 esnehensis Nakkady & Osman. 



Hypotypes. P.45556-57. 



Horizon and locality. Figured specimens PI. 8, figs /\a-d, PI. 9, figs. la-d, 

 from Sample No. 18, W. El-Sharawna section ; PI. 10, figs, za-c, which is a tran- 

 sitional form between G. stuarti subspinosa Pessagno and G. stuarti stuarti (de 

 Lapparent), is from Sample No. 16 of the same section. 



Stratigraphical range. G. stuarti stuarti was first described by de Lapparent 

 (1918) from the Maestrichtian rocks of the Hendaye region, southwestern France, 

 and was recorded from the same region by Reichel (1950). All later reliable 

 records are from rocks of Upper Campanian-Maestrichtian age. 



In the Esna-Idfu region, G. stuarti stuarti (de Lapparent) occurs as a common 

 form in the Lower Maestrichtian G. fornicata Zone and continues up to the lower part 

 of the G. gansseri Zone, where it is abundant, together with G. stuarti parva, G. 

 stuarti stuarti j or mis, and G. stuarti subspinosa. Only G. stuarti parva continues to 

 the Upper Maestrichtian, the other three subspecies having died out completely. 

 This may suggest that records of G. stuarti stuarti (de Lapparent) from the Upper 

 Maestrichtian are probably erroneous. However, Berggren (1962) stated that 

 " valid references to this species indicate its occurrence in the Upper Maestrichtian . " 

 and added " In Scandinavia G. stuarti s.s. appears for the first time in the Pseudo- 

 textularia elegans zone (= Praeglobotruncana mayaroensis zone ", but, Berggren's 

 G. stuarti (pi. 10, figs 2a-c), is not G. stuarti (de Lapparent), neither is Reyment's 

 (i960) G. cf. stuarti, nor Witwicka's (1958) G. stuarti, which he used as evidence. 

 Again, G. stuarti of Bolli (1951) is actually G. stuarti parva, and that of Pessagno (1962) 

 is transitional between G. stuarti stuarti and G. stuarti parva. 



Globotruncana stuarti stuartiformis Dalbiez 

 (PI. 9, figs. $a-d) 



? 1937a Globotruncana stuarti (de Lapparent) ; Glaessner : 39, pi. 1, figs. i$a-c. 

 ? 1953 Globotruncana rosetta (Carsey) ; Hagn : 98, pi. 8, figs. i6a-c, text-figs. 24, 25. 

 J 953 Globotruncana stuarti (de Lapparent) ; Subbotina : 201, pi. 15, figs. ^a-^c. 



