F. Chapman — ForMiiimfeml Limestones from Egypt. 109 



Mokattam Series of Aradj and Turra near Cairo. The fact that 

 the shell-texture is distinctly porous, as is also stated by Schwager, 

 shows that the species properly belongs to Tnmcatulina and not to 

 Ptdvinulina. 



Nos. 3,3356 and c. Farafra Oasis : Libyan Series. 



Teunoatulina Ungeriana (d'Orbigny). 



Rotalla Unijericuia, d'Orbiguy, 1846 : Foram. Foss. Vienne, p. 157, pi. viii, 



figs. 16-18. 

 PulvinuUna mokattamensis, Schwager, 1883 : Pala3ontograpliica, vol. xxx, Pal. 



Theil, p. 134, pi. xxviii, figs. Wa-cl. 



This widely distributed species is quite common in the Alveolina- 

 limestone of Farafra. It is a well-known form in all Tertiary 

 deposits. 



Nos. 3,3356 and c. Farafra Oasis : Libyan Series. 



AMPHISTEGINA, d'Orbigny [1826], 



Amphistegina Lessonii, d'Orbigny. 



A. Lessonii, d'Orb., 1826 : Anu. Sci. Nat., vol. vii, p. 304, No. 3, pi. xvii, figs. 1-4 ; 

 Modeles, No. 98. 



The sample of limestone from Wadi Dara, east of the Eed Sea 

 Hills, contains many specimens of A. Lessonii associated with large 

 Heterostegince. The former are somewhat flat varieties of the species, 

 and but for their inequilateral shape when cut through the umbonal 

 axis, might almost be mistaken for small nummulites as N. variolaria. 



No. 2,195, Ih. Wadi Dara, east of Red Sea Hills : Miocene. 



OPERCULINA, d'Orbigny [1826]. 

 Operculina complanata (Defrance), var. oanalifera, d'Arohiac. 



0. libyca, Schwager, 1883 : Palseontographica, vol. xxx. Pal. Theil, p. 142, 



pi. xxix (vi), figs. 2a-g. 

 0. complanata (Defr.), var. cawa^i/era, d'Archiac, Chapman, 1900: Geol. Mag., 



p. 7, PL XIII, Figs. 3«, 4« ; Pi. XIV, Fig. 12. 



This variety is met with in two of the samples, which are both 

 from the Baharia Oasis. The length of the largest specimen is 9 '5 mm . 



No. 1,531/. North of Mendische, Baharia Oasis : very abundant ; 

 Lower Eocene : Libyan Series. Also No. 3,348^, N.N.W. of Bawitti, 

 Baharia Oasis ; a few scattered and broken specimens. Lower 

 Eocene : Libyan Series. 



Operoulina complanata (Defrance), var. disooidea, Schwager, 



0. discoidea, Schwager, 1883 : Palfeontographica, vol. xxx. Pal. Theil, p. 145, 



pi. xxix ("vi), figs. ba-d. 

 0. complanata (Defr.), var. discoidea, Schwager, Chapman, 1900 : Geol. Mag., 



p. 8, PL XIV, Fig. 13. 



In cross-section this variety is easily distinguished from the 

 preceding form by the very pronounced septal ridges which stand 

 out prominently from the lateral shell- surface. 



West of Bawitti, on plateau west of Baharia Oasis, No. l,480e. 

 Common. Middle Eocene : Lower Mokattam Series. 



