368 F. Chapman — Tertiary Foraminifera 



four to six whorls, which increase rapidly in breadth (in median 

 section), especially towards the last. 



The specimens here dealt with are very typical when compared 

 with d'Archiac's figures. Those forms of the same group or type 

 recorded by De la Harpe from Egypt ^ differ chiefly in their umbonate 

 centre and comparatively sharp peripheral edge. 



N. planulnta appears to be distributed chiefly through the Lower 

 and Middle Eocene beds of Europe, but it is occasionally found with 

 a higher range. This species has been recorded by Dr. Fraas from 

 Egypt. 



Coll. Geol. Surv. Egypt, No. 4,112, Box No. 2Z. ? Bartonian 

 (Upper Eocene) or ? top of Mokattam Series (Middle Eocene) : Jebel 

 Abyad, beach deposit (later). Common. 



Nummulites Guettardi, d'Archiac & Haime, var. antiqua, De la Harpe. 

 (PI. XIII, Fig. 66.) 



Nummulites Guettardi, d'Archiac, var. antiqua, De la Harpe, 1883: Palseonto- 

 graphica, toI. xxx, Pal. Theil, p. 172, pi. xxx (i), figs. 37-42. 



The central chamber in our specimens from Sinai is fairly large, 

 agreeing in this particular with the typical examples of the species 

 figured by d'Archiac.^ De la Harpe, however, states that his speci- 

 mens have a small central chamber, so that it is possible that we 

 have here the two forms A and B confused by the above-named 

 authors. 



The variety antiqua difi'ers from the typical N. Guettardi in having 

 a lenticular and more compressed shell. The type form was found 

 by De la Harpe only in the Upper Eocene beds of Egypt. 



The above variety was found by De la Harpe in rocks of the 

 Libyan Series (liower Eocene) of Nekeb, east of Farafrah, and of 

 El-Guss-Abu-Said. 



Coll. Geol. Surv. Egypt, No. 3,902, Box No. 15/. Libyan Series 

 (Lower Eocene) : Jebel Krer, Sinai (same range as Jebel Abyad). 

 Common. 



Nummulites Ramondi, Defrance. (PI. XIII, Figs. 3&, 46.) 



N. Ramondi, Defrance, 1825 : Diet. Sci. Nat., vol. xxxv, p. 224. D'Archiac & 

 Haime, 1853 : Descr. Anim. groupe nummulitique Inde, vol. i, p. 128, 

 pi. vii, figs. 13«-(f, 14«, \ba, 16a, 17ff, b. 



This is a small species, but has no large central chamber. The 

 peripheral edge is sharper than that of N. Guettardi, and the test is- 

 much thinner. 



N. Ramondi is one of the most widely distributed of the nummu- 

 lites ; amongst many localities it has been found in France, the 

 Alps, the Pyrenees, Egypt, the Crimea, and India. From Egypt 

 De la Harpe obtained it in the Lower Libyan Series of Jebel Ter. 



Coll. Geol. Surv. Egypt, Nos. 4,113 and 4,135, Box Nos. 4Z and SI 

 respectively. Libyan Series (Lower Eocene) : junction of Wadi 



1 Palseontographica, vol. xxx (1883), Pal. Theil, pp. 161-4, pi. xxx, figs. 1-18 : 

 iV. Fraasi, N. Riitimeijeri, and iV. Chavannesi. 



- Descr. Anim, groupe nummulitique Inde, vol. i (1853), tT. 130, pi. vii,. 

 figs. I8a-c, 19«, b. 



