314 F. Chapnan — Tertiary Foraminifera 



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

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

 Sinai. 



Discorhina glohidans (d'Orbigny). (PI. XIV, Fig. 8.) 



Bosalina glohularis, d'Orb., 1826 : Ann. Sci. Nat., vol. vii, p. 271, No. 1, pi. xiii, 



figs. 1-4 ; Modeles, 1826, No. 69. 

 Diseorbi'na glohularis (d'Orb.), 1897, Jones & Chapman, in Professor Judd's 



Second Eeport on specimens of the deposits of the Nile Delta : Proc. 



Eoy. Soc, vol. Ixi, p. 38. 



The specimen seen in section is that of a simple, strongly inflated 

 Discorhina, similar to the above-named species. It has already been 

 recorded from slices of Eocene pebbles from the Nile Delta, and it 

 is also known from the Eocene of Grignon. It occurs in nearly all 

 fossiliferous strata dating from Tertiary times to the present. In 

 recent deposits D. glohularis is most abundant in shallow water, 

 averaging about 50 fathoms. 



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

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

 Sinai. 



Truncatulina, d'Orbigny [1826]. 



Trnncatulina umhonifera (Schwager). (PI. XIV, Figs. 10a, b.) 



Discorhina umhonifera, Schwager, 1883 : Palseontographica, vol. xxx. Pal. TheU, 

 p. 126, pi. xxvii (iv), figs, lia-d. 



The specimen obtained from the limestone of Sinai is apparently 

 a depauperated or irregularly grown individual of the above species. 

 The affinities of the original specimens and also of the present appear 

 to be nearer Trnncatulina than Discorhina. Schwager's specimens 

 came from the Libyan Series of El-Guss-Abu-Said, Egypt. 



Coll. Geol. Surv. Egypt, No. 3,598, Box No. 131. Mokattam 

 Series (Middle Eocene) : Wadi Khadahid, Sinai. 



EoTALiA, Lamarck [1804]. 



Botalia calcari/ormis (Schwager). (PI. XIV, Fig. 11.) 



Distorhina calcariformis, Schwager, 1883 : Palseontographica, vol. xxx. Pal. Theil, 

 p. 120, pi. xxvii, figs. 9«-rf. 



The specimens seen in these sections show a true rotaliform 

 structure in the shell-wall, with an interseptal canal system. 

 Schwager's figures also show secondary shell-thickening, and we 

 therefore refer them to the genus Botalia. B. calcariformis is not 

 far removed in outline from B. calcar of the present day, but since 

 the latter species shows a marked tendency to vary in the direction 

 of the elongation of the cuspid processes on the outer segments, 

 and B. calcariformis has a somewhat blunt cusp, the two series of 

 specimens may reasonably be kept distinct. 



B. calcariformis was found in the argillaceous beds of El-Guss- 

 Abu-Said (Libyan Series), Egypt. 



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

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

 Sinai. Frequent. 



