38 DR. J. W. GREGORY ON THE GEOLOGY AND [Feb. TQOO, 



size, with broad, shallow calices, sometimes separated by raised 

 walls 1 mm. thick. 



The columella is distinct, and stands up as a blunt prominence,' 

 surrounded by six paliform lobes formed by the union of the primary 

 and secondary septa. 



Septa in three cycles ; those of the first two cycles meet near the 

 columella. 



Dimensions (of two specimens). — 



mm. mm. 



Diameter of calices 3 to 4 3 to 4 



Distance of calicinal centres 4 to 5 4 to 5 



Diameter of branch of corallum ... 20 16 



Distribution. — Cherty Limestone: Somali Plateau. Coll. 

 Mr. F. B. Parkinson. 



Affinities. — This interesting coral appears on first examina- 

 tion similar to a Thamnastrcea, though the application of a hand- 

 lens at once shows that it is a perforate species. The presence of 

 six pali in some corallites raised doubts in my mind as to the generic 

 position of the coral ; from a study of the specimens collected by 

 Mr. Parkinson it seems probable, however, that there are no true 

 pali, but only paliform lobes. The species may thus enter Litharcca, 

 where its nearest ally is L. epithecata. Dune, from the Upper Cre- 

 taceous of Sind; Duncan's species has, however, a small hemispherical 

 and not a branched corallum. 



The specimen was collected from the cherty limestones which 

 overlie the cave-forming Net-in era-limestone above the Miriya Pass, 

 and around God-la- Yareh, south of Eur Dab (8° 30' lat. N. & 

 40° 30' long. E.). 



Genus Dendracis, Milne-Edwards & Haime, 1849. 



Dendracis sp. 



Mr. Parkinson's collection includes a worn branch of a dendroid 

 coral, which measures 9 mm. in diameter; the calices are slightly over 

 1 mm. in diameter, and the calicular margins are well raised. The 

 species is closely allied to D. nodosa, Ess. 1 but the specimen is too 

 small for definite determination. 



The specimen came from the cherty limestone, which overlies 

 the iVmwera-limestone. 



Genus Turbinacts, nov. 



Diagnosis. — Corallum arborescent. Coenenchyma in narrow 

 bands, variable in width. Calices small, circular, usually crowded. 

 Septa in adult calices numerous and subequal ; six large primary 

 septa in young calices. Columella large and parietal. No pali. 

 Tabulae present. 



1 A. E. von Reuss, 'Pal. Stud, liber die alteren Tertiarsebichten der Alpen : 

 pt. i, Anthozoen der Schicbten von Castelgomberto ' Denkschr. d. k. Akad. 

 "Wissenscb. Wien, vol. xxviii (1868 J pp. 172, 178 & pi. xy ? figs. 2, 5. 



