VoJ. 56.] FOSSIL CORALS AND ECH.INIDS OF SOMALILAND. 31 



the real fossil was displayed, and proved to be a Stylo phora instead 

 of a Latusastraean coral as had been at first suspected. 



The main characters of the species are the narrowness of the 

 eoenenchyma and the crowded arrangement of the corallites. 



Genus Stylina, Lamarck, 1816. 



1. Stylina subtabulata, sp. nov. (PI. I, figs. 2 a & 2 b.) 



Diagnosis. — Form of corallum unknown. The corallites are of 

 medium size and crowded. They are circular or elliptical in trans- 

 verse section. 



The septal symmetry is pentagonal or hexagonal, rarely heptagonal. 

 The septa belong to two complete cycles, with one or two small septa 

 representing the third cycle in a few of the primary loculi. The 

 primary septa are thick and conspicuous, whereas the secondary 

 septa are short and thin. Costae short, thick, and prominent. 



The columella is very small. 



The dissepiments are stout, and in longitudinal sections may 

 resemble tabulae. 



Dimensions. — Diameter of corallites =3 to 5 mm. ; distance of 

 calicinal centres =4 to 7 mm. 



Distribution. — Dobar Limestone: Dobar, south of Berbera. 

 Coll. Mrs. Lort Phillips. 



Affinities. — In general aspect, this coral closely resembles 

 Cryptocoenia Picteti, Koby, from the Swiss Urgonian ; but in the 

 Somaliland coral there is a distinct columella in many corallites, 

 and the diameter of the corallites is, on the average, nearly twice as 

 great. In septal characters the species agrees with the Upper 

 Senonian Stylina geminata (Goldf.), from Maastricht ; but the coral- 

 lites are larger and the columella is smaller. 



An interesting feature in this species is the strong development 

 and subtabulate arrangement of the dissepiments ; the presence of 

 definite tabulae in the closely-allied genus CyathopJiora may be thus 

 explained as merely exaggerated dissepiments. 1 



2. Sttlina Lort-Phtllipsi, Gregory. 



1896. Cryptocoenia Lort-Phillipsi, Gregory, Geol. Mag. p. 291. 

 Distribution. — Dobar Limestone, Dobar. Coll. Mrs. Lort- 

 Phillips. 



Genus Calamophyllia, de Blainville, 1830. 



Calamophyllia Aylmeri, sp. nov. (PI. I, fig. 3.) 



Diagnosis.' — Corallum with the corallites widely separated, the 

 interspaces being usually wider than the diameter of the corallites. 

 The corallites are circular or elliptical in transverse section, and are 

 slightly sinuous. They are connected by occasional collerettes, 

 which are somewhat thick and lamellar. 



1 Koby, Mem. Soc. Pal. Suisse, vol. xxiii, 'Mori. Polyp. Cr'et. Suisse' pt. ii 

 (1897) p. 82 & pi. ii, fig. 11. 



