F. Chapman — Foraminiferal Limestones from Egypt. 65 



As remarked above, the larger proportion of the rock is composed 

 of foraminifera belonging to the genus Alveolina ; but there are several 

 other genera present, considerably smaller in size and much rarer. 

 The list is as follows : MilioUna inflata, Alveolina ellipsoidalis, 

 A. decipiens, A. decipiens var. dolioliformis, A.pasticillata, Placopsilina 

 cenomana, Valvidina Schwageri sp. nov., Bulimina elegantissima var. 

 seminuda, Discorbina parisiensis, Truncatulina candidtda, T. Ungeriana, 

 Heterostegina depressa, Nummulites Biarritzensis var. prcecursor. 



Eocene : Upper Libyan or Lower Mokattam Series. 

 Box M, No. 1,531/. "Nummulitic and Opercidina limestone, 

 8 kilometres north of Mandisha, Baharia Oasis" (H. J. L. 

 Beadnell). 



A shaly, ochreous-stained limestone. Nummulites and Operculinee 

 largely make up the mass of the rock. A few fragments of a vesicular 

 lamellibranch shell-structure (Ostrea?) occur in thin sections of this 

 limestone. 



The foraminifera yielded by this rock are : Glohigerina cretacea 

 (? derived), Opercidina complanata var. canalifera (=0. lihyca, 

 Sch wager), Nummulites Bamondi, and N. variolaria. 



Eocene : Upper Libyan or Lower Mokattam Series. 

 Box M, No. 3,348^. "Nummulites and Operculinee. Cliff 8 kilo- 

 metres N.N.W. of Bawitti, Baharia Oasis " (H. J. L. Beadnell). 

 (PI. IV, Fig. 6.) 



A pale ochre-yellow limestone with numerous cavities once 

 occupied by nummulites and Operculinee. The entire substance 

 of this rock has undergone chemical and molecular change. The 

 cementing material, as seen under the microscope, is recrystallized 

 and dolomitized, whilst the cavities representing the nummulites 

 and shells are either filled with calcite, or, as in the case of the 

 larger nummulites and Opercidines, represented only by hollow casts, 

 or skeleton whorls bordered by dolomite rhombs. The surfaces of 

 the cavities of the foraminiferal casts sometimes show a distinct 

 septation, so much so as to leave no doubt regarding the identity 

 of at least two species of the foraminifera. 



The foraminifera present in this rock appear to be Operculina 

 complanata var. canalifera, Nummidites ? Biarritzensis var. prcecursor, 

 and N. Guettardi var. antiqua. 



Eocene : Upper Libyan or Lower Mokattam Series. 

 Box M, No. 1516L "Nummulites, 17 kilometres N.N.E. of 

 Ain-el-Haiss, Baharia Oasis" (H. J. L. Beadnell). 



A series of nummulites comprising two species in about equal 

 proportion, namely, N. Beaumonti and N. suh-Beaiimonti. 



Eocene : Upper Libyan or Lower Mokattam Series. 



OSTEACODA. 



BAIEDIA, McCoy [1844]. 



Bairdia subdeltoid ea (Munster). 



Jones & Sherborn, 1889 : Monogr. Tert. Entom., Pal. Soc, p. 16, pi. i, figs. I5a, b. 

 Chapman, 1900 : Geol. Mag., Dec. IV, Vol. VII, p. 4. 



dbcahe IV. — VOL. IX. — no. ii. 5 



