32 DK. J. W. GEEGOEf ON THE GEOLOGY AND [Feb. I9OO, 



The septa are very thin, and belong to three cycles. There is no 

 columella, and the endotheca is very scanty. 



Dimensions. — Diameter of corallites = 1*5 to 2 mm. ; average 

 distance of calicinal centres = 5 mm. 



Distribution. — Uradu Limestone, near TJradu; north of the 

 foot of the Rugga Pass. Coll. Mrs. Lort Phillips. 



Affinities. — This species resembles G. radiata (Lamx.), 1 from 

 the Bathonian, in the small size of its corallites ; but it differs from 

 that coral by the more open growth of the corallum, the greater 

 number of septa, and less sinuous corallites. The general characters 

 of the corallum are more like those of Stylosmilia than of Calamo- 

 pliyllia ; but owing to the absence of the columella it is included in 

 the latter genus. In the description of the Kach corals I have 

 expressed doubt as to the continued separation of these two genera ; 2 

 the presence of the-well developed columella is the distinctive 

 feature of Stylosmilia. 



Genus Galaxea, Oken, 1815. 

 Galaxea ikeegulaeis (Milne-Edwards & Haime). 



1848. Sarcinula irregularis, Milne-Edwards & Haime, ' Monogr. des Astreides ' 

 Ann. Sci. Nat. ser. 3, vol. x, p. 316. 



1851. Galaxea irregularis, Milne-Edwards & Haime, 'Polyp. Foss. des Terr. 

 Pak'oz.' Arch. Mus. Hist. Nat. vol. v, p. 71 ; 1857. 'Hist. Nat. Cor.' vol. ii, p. 229 & 

 pi. D 2, fig. 2 j 1879. Klunzinger, ' Korallth. roth. Meer.' pt. ii, p. 78 & pi. vii, fig. 11. 



Distribution. — Raised reefs. In the Guban, near Berbera. 

 Coll. Capt. E. T. Marshall. 



Genus Oebicella, Dana, 1848. 

 Oebicella mammillosa, Klunzinger. 



1879. Orbicella mammillosa, Klunzinger, ' Korallth. roth. Meer.' pt. iii, p. 49 & 

 pi. v, fig. 5, pi. x, figs. 10 rt-10 c. 



Distribution. — Raised Reefs. In the Guban, near Berbera. 

 Coll. Capt. E. T. Marshall. 



Genus Coltjmnastejea, 3 d'Orbigny, 1849. 



The inclusion of the following fossils in this genus necessitates 

 a slight alteration in its accepted definition, which we owe to 

 Milne-Edwards & Haime; for in one species, if not in more, 

 there are two crowns of pali instead of only one, as in the type- 

 species. The genus is nearly allied to Cyathomorpha, which has 

 more numerous septa. 



1. COLUMNASTEJEA BICOEONATA, 4 Sp. UOV. (PL II, figS. 7~9.) 



Diagnosis. — Corallum massive, apparently in nodular or hemi- 

 spherical masses. 



The corallites are of medium size ; the average diameter is 



1 Eunomia radiata, Lamouroux, Exp. Meth. p. 83 & pi. lxxxi, figs. 10-11. 



2 Gregory, ' Jur. Fauna Cutch ' Pal. Ind. ser. 9, vol. ii, pt. ii, pp. 49-50. 



3 This name was originally spelt Colwmastrma by d'Orbigny. 



4 Having two crowns of pali. 



