16 F. Chapman — Egyptian Foraminifera. 



example of the more regularlj'-built G. globulus (Eeuss). Both 

 species date from the Miocene. 



Pliocene : near Erment, right bank of Nile Valley. A fragment. 



Family NUMMULINID^. 



Subfamily Nummulitin.I':. 



AMPHISTEGINA, d'Orbigny [1826]. 



Ajiphistegina Lessonii, d'0rbign3^ 



AmpJdsiegina Lessonii, d'Orb., 1826 : Ann. Sci. Nat., vol. vii, 



p. 304, No. 3, pi. xvii, figs. 1-4 ; Modcle, No. 98. 

 A. mamillata, d'Orb., 1846 : Foram. Foss. Vienne, p. 208, pi. xii, 



figs. 6-8. 

 A. rugosa, id. : ibid., p. 209, pi. xii, figs. 9-11. 

 A.gibbosa, Williamson, 1851 : Trans. Micr. Soc. Lond., ser. i, vol. iii^ 



p. 110, pi. xvii, figs. 1, 2. 

 A. Lessoni, d'Orbigny : Parker, Jones, & Brady, 1865, Ann. Mag.^ 



Nat. Hist., ser. iii, vol. xvi, p. 34, pi. iii, fig. 92. 

 A. semicostata, Kaufmann, 1867: Geol. Beschreib. des Pilatus, p. 149,. 



pi. viii, fig. 18. 

 Hemistegiiia rotiila, id. : ibid., p. 150, pi. viii, fig. 19. 

 A. Lessonii, d'Orb., Moebius, 1880 : Foram. Mauritius, p. 99, pi. x, 



figs. 10-14 ; pi. xi, figs. 1-3. 

 A. Parisiensis, Terquem, 1882 : Mem. Soc. geol. France, ser. in, 



vol. ii, Mem. iii, p. 124, pi. xiii, figs. 3a, 6. 

 A. Lessonii, d'Orbigny, Brady, 1884: Eep. Chall., vol. ix, p. 740, 

 pi. cxi, figs. 1-7. 

 The above synonymy refers especially to the thick varieties of 

 A. Lessonii, since the examples met with in the Operculina-Wmestone 

 belong to that group. The specimens are well-grown, and exhibit in 

 all cases a well-developed cone of non-tubulous shell material. 



Typical specimens of A. Lessonii date from the Eocene period, and 

 they abound in some rocks of Miocene and Pliocene ages. 



Pliocene : near Erment, right bank of Nile Valley. Frequent. 



OPERCULINA, d'Orbigny [1826]. 



Operculina ammonoides (Gronovius). (PI. II, Figs. 6, 7.) 



Nautilus ammonoides, Gronovius, 1781 : Zooph. Gron., p. 282. 



No. 1,220, and p. v (expl. Tab.). 

 N. Balthicus, Schroeter, 1782, Naturforscher, vol. xvii, p. 120; 



1783, Einleitung, vol. i, p. 20, ph i, fig. 2. 

 Operculina complanata (Defrance), Parker & Jones, 1857 : Ann. Mag. 



Nat. Hist., ser. ii, vol. xix, p. 285, pi. xi, figs. 3, 4. 

 0. ammonoides (Gronovius), Parker & Jones, 1861 : Ann. Mag. Nat. 



Hist., ser. in, vol. viii, pp. 229, 230. 

 Brady, 1884 : Eep. Chall., vol ix, p. 745, pi. cxii, figs. 1, 2. 

 A. Silvestri, 1893 : Mem. Pontif. Accad. N. Lincei, vol. ix, p. 217, 



pi. vi, fig. 5. 

 Eupert Jones, 1897 : Mon. Foram. Crag, pt. iv, p. 364, pi. vii, 



figs. 34a, h. Also, var. curvicamerata, Jones, ibid.. 



p. 365, pi. V, fig. 33. 



