372 F. CJiapman- — Tertiary Foraminifera 



■ This species is named after Mr. T. Barron, F.G.S., who collected 

 the specimens during his work in Sinai, January to June, 1899. 



Coll. Geol. Surv. Egypt, No. 3,598, Box No. 13/. Mokattam 

 Series (Middle Eocene) : Wadi Khadahid, Sinai. Common. 

 ■ Orbitoides, d'Orbigny [1847]. 



Orhitoides (Discocyclina) dispansa (Sowerby) . (PI. XIII, Figs. 6c, 7c.) 



lycophris dispansus, Sowerby, 1837 [1840] : Trans. Geol. Soc. Lend., ser. ii, vol. v^ 



pp. 327, 718, pi. xxiv, figs. 16, 16«, b. 

 Orlitoides dilaUda, Schwager, 1883 : Palajontographica, vol. xxx. Pal. Theil, p. 140, 



pi. xxix, figs, la-e.' 



' Schwager records this species under the name of 0. dilabida from 

 both the Libyan and the Mokattam Series of Egypt ; Dr. Carter 

 found it in Scinde, Kutch, and Arabia. 



Nearly all our Sinaitic examples are slightly abraded, as if rolled 

 by current agency, and in one of the specimens, No. 4,112, of later 

 age, they are quite fragmentary. 



Coll. Geol. Surv. Egypt, No. 4,111, Box No. IL Mokattam Series 

 (Middle Eocene) : top of Jebel Abyad, south of Wadi Gharandel, 

 Sinai. Frequent. No. 4,112, Box No. 2Z. (Derived) ? Bartonian 

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

 beach deposit, Jebel Abj'ad, Sinai. Rare, broken. No. 3,902, Box, 

 No. 151. Libyan Series (Lower Eocene) : Jebel Krer, Sinai, 

 Common. 



Orbitoides (Discocyclina) papyracea (Boubee). 



Nummulites papyracea, Boubee, 1832 : Bull. Soc. geol. France, ser. ii, p. 445. 

 Orbitoides [Biscocyclina) papyracea (Boubee), Giimbel, 1868 [1870] : Abhandl. M. 



ph. CI. k. bayer. Ak. Wiss., vol. x, p. 690, pi. iii, figs. 3-12, 19-29. _ 

 0. papyracea (Boubee), Schwager, 1883: Palseontographica, vol. xxx. Pal. Theil, 



p. 139. 

 0. midimargo, Schwager, 1883 : op. cit., p. 139, pi. xxix, figs. %a-e. 



The specimens in the Sinaitic limestones show every deviation 

 between the forms figured by Schwager as 0. nudimnrgo and 

 ordinary specimens of 0. papyracea, which sometimes have a slightly 

 thicker test. Our examples are seen in section and are generally 

 more or less fragmentary. 



0. papyracea has been found in both the Libyan and Mokattam 

 Series in Egj'pt. 



Coll. Geol. Surv. Egypt, No. 4,111, Box No. 11. Mokattam Series 

 (Middle Eocene) : top of Jebel Abyad, south of Wadi Gharandel, 

 Sinai. Frequent. No. 3,902, Box No. 151. Libyan Series (Lower- 

 Eocene) : Jebel Krer, Sinai. Eare. 



Orbitoides (Discocyclina) epliippium (Schlotheim). 



Lenticulites epliippium, Schlotheim, 1820 : Die Petrefactenkunde, p. 89. 



Orbitoides [Discocyclina) ephippium (Schlotheim), Giimbel, 1868 [1870]: Abhandl. 



m. ph. CI. k. bayer. Ak. Wiss., vol. x, p. 696, pi. iii, figs. 15, 16. 38, 39. 

 Orbitoides ephippium (Schlotheim), Schwager, 1883 : Palajontographica, vol. xxx. 



Pal. Theil, p. 139. 



A few characteristic examples of the above species occur in our 

 sections. It was recorded by Schwager from the Mokattam Series 

 of Egypt. 



