in Limestones from Sinai. -369 



Baba and Wadi Shellal, Sinai. Common. ? No. 3,598, Box No. 13?. 

 jMokattam Series (Middle Eocene) : Wadi Khadabid. Rare. 



Nummulites Heherti, d'Arcbiac & Haime. 

 ■.Nummulites Hebcrti, d'Archiac & Haime, 1853 : Descr. groupe nummulitique Inde, 

 vol. i, p. 147, pi. ix, figs, \ia-g, Ida. De la Harpe, 1883 : PahBonto- 

 graphica, vol. xxx, Pal. Theil, p. 178, pi. xxxi (ii), figs. 26, 27. 



Tbis is a very minute nuramulite, baving an umbonate centre and 

 a sbarp peripberal edge. Tbe central cbaraber is almost invisible. 

 Tlie specimens from Sinai measure about 2 mm. in diameter and 

 *85 mm. in thickness. N. Heherti was found by Scbwager in both 

 the Libyan and Bartonian Series of Egypt- 

 Coll. Geol. Surv. Egypt, No. 4,112, Box No. 21. ? Bartonian 

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

 Jebel Abyad, Sinai, beach deposit (later). Frequent. Also No. 3,902, 

 Box No. 15/. Libyan Series (Lower Eocene; : Jebel Krer (same 

 range as Jebel Abyad), Sinai. Rare. 



Nummulites variolaria (Lamarck). (PL XIII, Fig. 26.) 

 LenticuUtes viriohrin, Lamarck, 1804 : Ann. du Museum, vol. v, p. 187, No. 2. 

 Nummularia variolaria (I,am.), Sowerby, 1829 : Mineral Concliology, voL vi, p. -76, 



pi. Dxxxviii, fig. 3. 

 Nummulites variolaria (Sow.), d'Archiac «& Haime, 1853 : Descr. Anim. groupe 



nummulitique Inde, vol. i, p. 146, pi. ix, figs. 13a-^. 

 N. variolaria (Lam.), De la Harpe, 1883 : Palseoutographica, vol. xxx. Pal. Theil, 

 p. 179, pi. xxxi (ii), figs. 28-36. 



Tliis is one of tbe most widely distributed nummulites. It occurs 

 in Hampshire, near Brussels, Biarritz, in Hungary, Asia Minor, 

 Kurdistan, etc. It is usually characteristic of tbe Middle and Upper 

 Eocene. In Egypt it has been found in the Lower and Upper 

 Eocene (De la Harpe). 



It is fairly common in the specimen from Sinai, No. 4,112, and is 

 associated with iV. pJanulata. The characters by which one recog- 

 nizes it in section are tlie lenticular outline and sharp peripheral 

 edges. In the tangential aspect the sections exhibit the regularly 

 striated shell surface. The central chamber is moderately large. 



Coll. Geol. Surv. Egypt, No. 4,112, Box No. 21. ? Bartonian 

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

 beach deposit, Jebel Abyad, Sinai. Frequent. 



Nummulites subdiscorbina, De la Harpe. (PI. XIII, Fig. 1.) 

 Nummulites subdiscorbina, De la Harpe, 1883: Pahcontographica, vol. xxx. Pal. 

 Theil, p. 185, pi. xxxii (iii), figs. 8-15. 



This species is not unlike N. Guettardi, var. antiqua, but differs in 

 tbe greater proportionate breadth of tbe test; it also exhibits 

 Strongly developed double cones of tubuli at the umbilical axis. 

 This species is relatively larger than N. Guettardi, var. antiqua. 



De la Harpe states that N. subdiscorbina usually accompanies the 

 larger species iV. discorbina, but this is not the case with those of the 

 Sinaitic limestones. The Egyptian specimens were found near Cairo, 

 at Beni Hassan and Minieh. 



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

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

 Sinai. Abundant. 



DECADE IV. VOL. VII. — NO. VIII. 



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