250 Dr. J. W. Gregory — Egyptian Corals. 



corallites with the columella are shown on PI. VIII, Fig. 6, The 

 coralluin occurs in cylindrical or flat branches. 



Genus LITHAR^A, Edwards & Haime, 1849. 

 LiTHAK^A EPiTHEOATA, Duncan, 1880.^ 



Distribution. — Cardila Beaumonti Series : Sind. Lower Eocene 

 — Libyan Series : a little south of Silsila, on the Nile (lat. 20° 40'), 

 Upper Egypt : Coll. Geol. Surv. Egypt, Nos. 165, 176, 183 ; Dungul 

 Wells (lat. 23° 30', long. 31° 20'), Upper Egypt; same coll., No. 306. 



Description of Figures. — PL VIII, Fig. 7, part of the surface 

 of a young corallum with deep calices (No. 183), x 2 diam. ; 

 PI. IX, Fig. 6, part of a hemispherical corallum (No. 306), x 2 diam. 



Remarks. — The coral is represented in the Egyptian collection by 

 two forms — one with a low, flat, broad corallum, like the type of the 

 species ; and the other, hemispherical, like Duncan's var. hemispherica. 

 I do not see how these Egyptian corals can be specifically separated 

 from the Sind specimens, and so describe them as a geographical 

 variety. 



Litharcea epithecata is closely allied to L. rndis, Eeuss,^ but the 

 septa are stouter and stronger than in that Oligocene form, which 

 has been recorded by Felix from the Wadi Ramlieh in Egypt. 



IV. CEETACEOTJS.^ 



Genus PHYLLOCCENIA, Edwards & Haime, 1848. 



Phylloocenia Toucasi, De Fromentel, 1884. 



"Pal. Fran§. Terr. Cret.," Zooph., p. 549, pi. cliii. 



Var. jEgyptiaca. 



Characters. — This coral differs from the typical form of the 

 species by the smaller size of the corallites, which are, moreover, 

 somewhat more crowded. In other respects the corallum agrees 

 precisely with the specimen figured by De Fromentel : the costge are 

 not always alternately unequal, but then they do not appear to be 

 so in the original figure. 



Dimensions. 



Type. Var. ^gyptiaca. 



Height of corallum — 42 mm. 



Diameter of corallum — 61 x 87 mm. 



Average diameter of corallite ... 8 mm. 4-5 mm. 



Average distance of calicinal centres 10 mm. 5-6 mm. 



Septa 3 complete cycles. 3 complete cycles. 



1 " Foss. Cor. Sind" : Pal. Indica, ser. xiv, pt. 1, p. 23, pi. ii. 



2 Yon Eeuss, "Pal. Stud. alt. Tert. Alpen" : Denk. Akad. Wiss. Wien, 

 vol. xxix (1869), p. 251, pi. xxvii, fig. 2. 



^ A description of the Cretaceous rocks of Abu Eoasch, with a diagrammatic map 

 of the fault system in the district, has been given by J. Walther, " L' Apparition de 

 la Craie aux Environs des Pyramides " : Eull. Inst. Egypt, ser. 2, No. 8 (1887), 

 pp. 3-13 ; 2 pis. 



