the Nomenclature of the Foraniinifera. 283 



plates XXIV., XXV., xxvi.) indicate a sea-depth of from 30 to 

 40 fathoms. In broad terms, they may be said to be not of 

 shallow water nor of very great depths, neither littoral nor 

 abyssal, but decidedly within 20 and 90 fathoms. 



Species and notable Varieties of Foraniinifera from the Num- 

 mulitic Limestone of Oyzeh and Mokattam^ Egyptj figured 

 hy Ehrenherg. 



1. Lagena globosa [Montagu). 



2. Cristellaria cultrata (Monff). 



3. Bolivina punctata, Z)' Orb. 



4. dilatata, Reuss. 



5. Virgulina Hemprichii (Ehr.). 



6. Textilaria agglutinans, Z)' Orb. 



7. sagittula, Defrance. 



8. • gibbosa, i)'C>rJ. 



9. globulosa, Ehr. 



10. Globigerina bulloides, D' Orb. 



11. Planorbulina farcta [F. & 31.), varr. 



12. globulosa (Ehr.). 



13. ammonoides (Ess.). 



14. ariminensis (D^Orb.). 



15. Pulvinulina Pharaonum (Ehr.). 



16. Rotalia ammoniformis (Lam.). 



17. Nonionina scapha (F. & M.). 



18. Operculina complanata {Defrance). 



19. Nummulina gyzehensis (Forskal). 



20. curvispira, Meneg. 



21. • Guettardi, B''Arch. &, Haime. 



VII. Limestone from the Tombs at Thebes j Egypt. (Abhandl. 

 1838, p. 94, table xiv., pi. 4. no. viii. ; Annals Nat. Hist, 

 vol. vii. July 1841, p. 374 &c.) 



This very interesting Foraminiferal Limestone, " halibio- 

 lith " (Ehrenberg), or marine organic rock, is, both by rela- 

 tive position* and contents, older than the Nummulitic Lime- 

 stone. The presence of Globigerina cretacea, D'Orb., goes 

 far to prove this halibiolithic formation to be of Secondary 

 age. 



The limestones of Benisouef, Siout, and Thebes, on the 

 western banks of the Nile, are represented in this analysis, 



Plate XXIV. figs. 1, 2, Cenchridium dactylus (" compare 

 Monatsber. 1845, p. 358"). This is a long-ovate and sub- 



* See Newbold's description and section, Quart. .Tourn. Geol. Soc. 

 vol. iv. p. .328 ; also Russegger's * Reisen ' and Atlas, 1841-42. 



20* 



