52 Prof. J. W. Gregory — Fossil Corah from Egypt, etc. 



II. MIOCENE. 



FAVIA, Oken, 1815. 



Favia humei, n.sp. (PI. VI, Fig. 2.) 



Diagnosis. — Corallum massive ; surface subplane. Compact and 

 dense in texture, with the exotheca well developed in horizontal, 

 platform-like layers. 



Corallites mostly elliptical and deformed ; rarely circular. Their 

 diameter is small. Corallites crowded, but the calicular edges are 

 separated by well-marked furrows, 1-1 2 nim. across. 



Septa, complete cj'^cles ; an incomplete fourth cycle may be 

 present. Paliform lobes indistinct. 



Calices shallow. 



Dimensions. — The fragment of corallum measures : — 



Length 80mm. 



Width 56 „ 



Thickness 45 ,, 



Corallites : — 



Diameter 3 or 4 mm. ■wide, by 4| mm. long. 



Calicinal centres : — 



Distance 5-6mm. 



Distribution. — Miocene. From Eeef No. 2, plateau between 

 Camps 27 and 28, Wadi Belih, Abu Sha'ar. Collected by Mr. T. 

 Barron, H 1780. 



Figxires. — PL VI, Fig. 2, part of the surface of the corallum, 

 hy \h diameter. 



Affinities. — This species is easily distinguished from those that 

 most nearly resemble it, by the small size of the corallites. Its 

 nearest ally seems to me to be -F. savignyi, Ed. & H.,' in which 

 the calices are 12-15 mm. wide and 4-5 mm. deep. 



Favia corollaris (Keuss) ■ has corallites from 7 to 8-5 mm. in 

 diameter, and they are more constantly circular in form. 



OEBICELLA, Dana, 1848. 

 1. Orbicella mellahica,^ n.sp. (PI. VI, Figs. 3 and 4.) 



Diagnosis. — Corallum large, massive, with subplane upper surface, 

 which is ornamented by the slightly raised calicinal borders ; by 

 the long and often confluent costce, between which are occasional 

 large granules. 



Corallites long, circular, or elliptical ; diameter from 4-5 mm. 

 Walls of medium strength, being about half a millimetre in thickness. 

 Calices very shallow in well-preserved corallites ; borders low. 

 Septa 3 cycles, with an occasional rudimentary septum of a fourth 

 cycle in the largest corallites. In larger corallites, with the best 



^ Edwards & Haime: Hist. nat. Cor., vol. ii, p. 437. 



- Yon Reuss. Kor. ost. ung. Mioc. : Denk. Akad. Wiss. "Wieu, vol. xxxi (1S72), 

 p. 238, pi. xii, tig. 3. 

 2 After Jebel MeUaha, the locality of the type-specimen. 



