Yol. 56.] FOSSIL CORALS AND ECHINIDS OF SOMALILAND. 35 



Genus Fa via, Oken, 1815. 



1. Favia lobata (Milne-Edwards & Haime). 



1849. Parastrcea lobata, M.-E. & H. ' Monogr. des Astreides ' Ann Sci. Nat. 

 ser. 3, vol. xii, p. 171. 



1857. Favia lobata, M.-E. & H. ' Hist. Nat. Cor.' vol. ii, p. 434 & pi. D 8, fig. 3. 



Distribution. — This coral is abundant in the existing reefs of 

 the Red Sea, and occurs in the raised reefs of Egypt and Sinai. 

 The specimen collected by Mrs. Lort Phillips is much altered; though 

 it has larger calices than is usually the case in F. lobata, there is no 

 doubt that it belongs to that species. It was found at Dobar, but was 

 probably carried there as building-material from the raised limestones 

 of the Somali coast, near Berbera. It is the only Pleistocene species 

 that is represented in Mrs. Lort Phillips's collection. 



2. Favia somall^nsis, sp. nov. (PI. I, figs. 4 a & 46.) 



Diagnosis. — Corallum nodular; small. 



Corallites of medium size, elliptical, quadrangular, or subtrigonal ; 

 in very short series. The walls are usually from 3 to 4 mm. thick, 

 although the walls between newly-separated corallites may be only 

 1 mm. thick. 



The septa belong to three complete cycles, with some represen- 

 tatives of a fourth. The septa of the primary and secondary cycles 

 are subequal. 



Dimensions. — Diameter of corallites = 5 to 8 mm. ; distance of 

 calicinal centres = 6 to 8 mm. ; corallum : diameter=55 by 70 mm. ; 

 height = 35 mm. 



Distribution. — Uradu Limestone : Uradu. Coll. Mrs. Lort 

 Phillips. 



Affinities. — This coral may be regarded as a larger, coarser 

 form of F. Lorioli, Koby, 1 from the Swiss Urgonian. Our coral 

 may be only a geographical variety of that species, having coral- 

 lites twice the width, owing to growth under more tropical condi- 

 tions. As the only known corallum, however, is no larger than 

 those of the Swiss species, this hypothesis must be regarded as 

 merely a tentative suggestion. 



Genus Metethmos, Gregory, 1899. 2 



Diagnosis. — Ethmotidae in which the corallum is simple and 

 the calice shallow ; some of the septa are perforated near their 

 inner and upper ends, but the pores in the older septa and near the 

 wall are closed by stereoplasm. Synapticulse scarce. Columella 

 well developed, papillary. 



Affinities. — This genus was founded for some Bathonian corals 

 from Kach, of which the type is M. Blanfordi, Greg. 



1 Koby, Mem. Soc. Pal. Suisse, vol. xxiii 'Monogr. Polyp. Cret. Suisse' pt. ii 

 (1897) p. 53 & pi. x, figs. 6-7. 



2 ' Jur. Fauna Outch ' Pal. Ind. ser. 9, vol. ii, pt. ii, p. 165. 



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