96 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



larger, subglobular, inflated chambers which tend to be roughly crescentic towards 

 the last whorl and which increase moderately in size ; the last whorl composed of 5 

 large, narrow, distinctly elongated chambers, roughly crescentic in the early part, 

 irregular, folded and undulate in the last two chambers, which increase moderately 

 in size although the last chamber is slightly smaller than the penultimate ; the 5 

 chambers on the ventral side are large, angular, roughly rectangular, strongly 

 elongated and increase moderately in size except for the last one ; sutures on the 

 dorsal side short, curved, beaded in the early part and distinctly elongated, curved, 

 undulated, raised, thickened and beaded later ; on the ventral side the sutures are 

 slightly curved in the early part, straight, radial and depressed in the later ; umbili- 

 cus roughly stellate in outline, relatively wide, deep, bordered by thick beaded 

 ridges which fade out gradually towards the last chamber ; it is covered by complex 

 tegilla of which remnants are still preserved ; primary apertures interiomarginal, 

 umbilical ; tegilla, with accessory apertures, only poorly preserved ; wall calcareous, 

 perforate except for the imperforate keels, peripheral band and tegilla ; surface 

 delicately papillose, especially in the early part and on the ventral side. 



Dimensions of holotype. 



Maximum diameter = 070 mm. 



Minimum diameter = 0-54 mm. 



Thickness = 0-31 mm. 



Remarks. This form represents the maximum development of a whole series of 

 transitional stages between G. fornicata fornicata Plummer and G. contusa contusa 

 (Cushman). It could neither be included in the former species, although it occurs 

 with it, nor in the latter as it is morphologically slightly different and stratigraphical- 

 ly older. It is more closely related to G. contusa contusa (Cushman) of which it is 

 therefore considered a subspecies. 



Pozaryski & Witwicka (1956) mentioned the occurrence of what they described as 

 G. fornicata var. contusa in the Upper Campanian of the Lublin Basin, central 

 Poland, but gave no figure or description. Their form may belong to the present 

 subspecies or it may be transitional to G. fornicata fornicata Plummer. However, as 

 all forms of G. fornicata which show transitional characters to G. contusa are included 

 in the present subspecies, Pozaryski & Witwicka's form is considered to belong here. 

 This subspecies is named after Dr. E. Witwicka of the Geological Institute, Rako- 

 wiecka, Poland. 



Holotype. P. 45524. 



Paratypes. P.45525. 



Horizon and locality. Holotype and paratypes, from sample No. 4, Abou 

 Saboun section. 



Stratigraphical range. The subspecies is restricted in the present sections to 

 the Lower Maestrichtian G. fornicata Zone, where it is common to abundant. The 

 form described by Pozariski & Witwicka (1956) as G. fornicata var. contusa which 



