110 F. Chapman — For aminiferal Limestones from Egypt. 



Opbrculina oomplanata (Defr.), var. pyramidum, Ehrenberg, var. 



Planiilina pyramidum, Ehrenberg, 1838 : Abhandl. k. Wiss. Berlin, p. 93, pi. iv, 



fig. 7. 

 OpercuUna pyramidum (Ehr.), Schwager, 1883 : False ontographica, vol. xxx, Pal. 



Theil, p. 143, pi. xxix (vi). 



From a zoological standpoint this variety is fairly comparable with 

 granulosa of Leymerie, but since it shows some little differences from 

 the strongly beaded form just named, in having a somewhat neater 

 test, we may perhaps retain for the Egyptian specimens the name 

 which Ehrenberg gave. It is easily separated from the two 

 preceding in thin sections of the rock, by its having a thicker test, 

 and the secondary bead ornamentation along the septal ridges. 



No. 3,535, 52^. North of Salamuni, between Assiut and Qena, 

 «ast side of Nile. Common. Lower Eocene : Upper Libyan Series. 



HETEEOSTEQINA, d'Orbigny [1826]. 



Heterostegina depressa, d'Orbigny. 



E. depressa, d'Orbigny, 1826: Ann. Sci. ISTat., vol. vii, p. 305, No. 2, pi. xvii, 

 figs. 5-7 ; Modeles, No. 99. Chapman, 1900 : Geol. Mag., p. 8, 

 PL XIII, Fig. 7«. 



This is an extremely abundant form in one of the limestones, 

 where it is represented by some thin, large, flexuose tests (2,195, 1^), 

 frequently measuring 7 mm. in diameter. The second occurrence 

 is in the Alveolina-lmiQ^ione (3,335& and c), and there we have 

 met with only one example, probably a young individual, closely 

 resembling d'Orbigny 's Heterostegina simplex of the Vienna Tertiaries. 



Specimen 2,195, IJi. Two kilometres north-west of Camp 49, 

 Wadi Dara, east of Eed Sea Hills. Miocene. 



Specimens 3,3356 and c. Western wall of depression, Farafra 

 Oasis. Lower Eocene : Libyan Series. 



NUMMULITES, Lamarck [1801]. 

 NuMMULiTEs BiARRiTZENSis, d'Archiac, var. PRiEOURSOR, De la Harpe. 



De la Harpe, 1883: Palaeontographica, vol. xxx. Pal. Theil, p. 170, pi. xxx (i), 

 figs. 21-28. 



The variety is more compressed than the type, and has generally 

 a sharper edge. The central chamber is almost invisible. De la Harpe 

 described this variety from the grey marl of the lower Libyan 

 Series east and west of Farafra. 



Nos. 3,335& and c. Alveolina-livaesiorie, from western wall of 

 depression, Farafra Oasis. Rather rare. Lower Eocene : Libyan 

 Series. 



Also doubtfully from specimen 3,348^'. Eight kilometres N.N.W. 

 of Bawitti, Baharia Oasis. Lower Eocene : Libyan Series. 



Ntjmmulites Guettardi, d'Archiac & Haime, var. antiqua, 

 De la Harpe. 



De la Harpe, 1883 : Palseontographica, vol. xxx, Pal. Theil, p. 172, pi. xxx (i), 

 figs. 37-42. Chapman, 1900: Geol. Mag., p. 10, Fl. XIII, Fig. &b. 



The only occurrence for this variety in the present series is in the 

 much altered and recrystallized limestone from the Baharia Oasis. 



