in Limestones from Sinai. 371 



This variety is large, or moderatelj' large compared with others 

 of the same type ; discoid, compressed, and with rounded, blunt, or 

 sharp edges. The cross section shows the sides to be parallel. 



De la Harpe has recorded this variet}' from the Pyramids of 

 Gizeh, in the "Wadi Emsid-el-Flus, between Mer and Farafrah, on the 

 Garet-el-Dalleh, and near Eajan, between the Fajum and Beharieh. 



Coll. Geol. Surv. Egypt, No. -i,lll, Box No. U. Mokattam 

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

 Gharandel. Sinai. Frequent. No. 4,163, Box No. o/. Mokattam 

 Series (Middle Eocene) : near top of Jebel Safariat, Sinai. Frequent. 

 Also No. 3,598, Bos Xo. 13/. Mokattam Series (Middle Eocene) : 

 Wadi Khadahid, Sinai. Frequent. 



Nummulites curvispira, Savi & Meneghini. (PL XIII, Fig. 5.) 

 Nummiilina curvispira, Savi & Meneghini, 1851 : Consid. Geol. Toscana, p. 137. 

 Kummulitei curvispira (Menegh.), d'Archiac &: Haime, 1853 : Descr. Anim. groupe 

 nummulitique Inde, p. 127, pi. vi, tigs, \ba~d. Fraas, 1867 : Aus dem 

 Orient, p. 130. De la Harpe, 18S3 : Palaeontographica, vol. xxx, Pal. 

 Theil, p. 200, pi. xxxiv (v), figs. 42-67. 



This nummulite, although very variable, is generally of a flattened 

 lenticular shape, with rounded peripheral edge, sometimes more or 

 less sharp. In the latter feature it approaches N. Bouaulti, d'Arch. 

 and Haime. Clean fresh specimens often show the flesuose striation 

 ■which is characteristic of N. Gizehensis. The surface of specimens 

 slightly weathered is radially or sinuously striate, with granulations 

 sparsely scattered between them. The central chamber is usually 

 very large, and is followed by a semilunar segment. The whorls 

 are somewhat irregular, and there are usually six turns on a radius 

 of 3 mm. The chambers are elongate and greatly curved. 



N. curvispira has already been recorded from Sinai (Wadi 

 Gharandel) by Eupert Jones. It is commonly found at most of the 

 localities in Egypt in the Mokattam Series, at Mokattam, Gizeh, 

 Minieh, Beni Hassan, and the Libyan Desert. 



Coll. Geol. Surv. Egypt, No. 4,111, Box Xo. 1?. Mokattam Series 

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

 Sinai. Frequent. Xo. 3,593, Box Xo. 13?. Mokattam Series (Middle 

 Eocene) : Wadi Khadahid, Sinai. Very common. 



NnmmuUtes Barroni, sp. nov. (PI. XIV, Figs. 16a, h, c.) 



Test lenticular, swollen in the centre, hollowed near the periphery, 

 edge quite sharp. Surface striate and sometimes feebly granulate. 

 Average diameter, 5 mm. ; thickness at the centre, 2 mm. ; shell 

 with from •!• to 5 whorls ; 4 turns in a radius of 2 mm. Septa 

 strongly arched. Central chamber subspherical and very large, one 

 measuring -75 mm. 



This species recalls N. Bouaulti by its general shape, but the 

 edge is much sharper, and the thickness at the centre is greater in 

 relative proportion to size. 



The three species N. curvispira, N. Bouaulti, and N. Barroni are 

 probably related, and represent a group of the megalospheric type 

 ■which has a dimorphic relationship with N. Gizehensis and its 

 varieties. 



