Dr. Fowrtau—LEchimid Fauna of the Neogene. 359 
sandstones. Only flat Clypeasters are found in these beds. In the 
northern part of the eastern basin, between Cairo and Suez, the 
Lithothamnium and foraminiferal beds alternate with soft sandy 
limestones and coral reefs. Their fauna is richer and the Clypeasters 
are higher, whilst the southern part of the same basin possesses 
a very sparse fauna, this being due, in spite of the abundance of 
limestones, to the influence of the phenomena which have given rise 
to the oilfields. 
On the other hand, the Lower Miocene deposits are detrital or of 
purely littoral origin in the western basin, whilst in the eastern basin 
their facies indicates neritic and bathyal formations except at the 
eastern foot of the Geneifa range, where they are littoral as in the 
western basin. 
Now, the abundance of Scutelle, which in places form a very 
shell-breccia, indicates a general facies of littoral or sub- littoral 
characters, this being confir med by the relative rarity of the Cidaride *- 
and also of Brissopsis, an essentially deep-sea genus. 
STAGES. HORIZONS. CHARACTERISTIC HCHINIDS. 
Upper Plaisancian— | Clypeaster egyptiacus, Wright. 
Neogene. Astian. Echinolampas hoffmanni, Desor. 
Western Basin. EKastern Basin. 
4 ( 
’ Middle Vindobonian. | Amphiope fuchsi, Four- | Leiocidaris sismondat, 
Neogene. tau, Scwtella huntert,| Mayer, Clypeaster isth- 
Fourtau, Clypeaster| muicus, Fuchs, Scutella 
martini, var. rohlfst, | deflersi, Gauthier, Plio- 
Fuchs, Hchimolampas | lampas pioti, Gauthier, 
amplus, Fuchs, H.| Echinolampas amplus, 
plagiosomus, Agassiz, | var.meridionalis, Four- 
‘ H. hemisphericus,| tau. 
Lamarck. 
Lower Burdigalian.’ | Scwtellazitteli, Beyrich.| Scutella zitteli, Beyrich, 
Neogene. Clypeaster  depereti, 
Gauthier, Hchinolam: 
pas orlebari, Gauthier, 
Brissopsis crescenticus, 
race fraast, Fuchs, 
Maretia tuberosa, 
Fraas. 
From the point of view of stratigraphical divisions and their 
synchronization with the horizons noted in the different regions of 
1 The recent discovery of the Echinolampas discus, Desor, by Lieut.-Colonel 
W. EH. Jennings-Bramly, at Gebel Hamamia, near Birket Mogara, in the 
Western Desert, seems to indicate the presence in Egypt of marine deposits 
belonging to the lowest horizon of the Neogene, the Aquitanian. 
