Vol. 56.] FOSSIL CORALS AND ECHINIDS OF SOMALILAND. 33 



about 4 mm. The corallites are separated by distinct but narrow 

 spaces, with comparatively little exotheca. The walls are thick. 



Septa in three complete cycles ; they are thick at the base and 

 taper rapidly. 



The columella is small and inconspicuous. 



Pali : one crown of six strong cylindrical pali, alternating with 

 which are six thin, inconspicuous lamellar pali. 



Dimensions (of three specimens). — 



No. 31. No. 32. 1 No. 16. 

 mm. mm. mm. 



Diameter of the corallites 3 to 5 4 to 5 4 to 6 



Distance of calicinal centres 4*5 to 5*5 5 to 55 5 to 7 



Corallum: diameter broken fragment ... 75 bv 65 



height 70 by 50 85 40 



Distribution. — TTradu Limestone : near Uradu, south of Dobar, 

 and in the Duban. Coll. Mrs. Lort Phillips. 



Affinities. — Columnastrcea bicoronata differs from previously- 

 described species of the genus by its double crown of pali and the 

 greater size of the corallites. The spaces between the corallites 

 are sometimes completely filled by calcareous material, in such wise 

 that the corallites appear united by solid walls. 



2. COLUIMNASTE^A PhILLIPSI^], sp. UOV. (PI. II, fig. 10.) 



Diagnosis. — Corallum massive. 



Corallites very small : the average diameter being about 2 mm. 

 The corallites are closely crowded, but internally appear definitely 

 separated by narrow intermediate spaces. Exotheca very scanty. 

 The corallites in section are usually circular or elliptical, but are 

 sometimes subtrigonal. Distance of the calicinal centres = 2'5 mm. 



Septa very thin ; the primary are decidedly more distinct than 

 the secondary. There are three complete cycles and some repre- 

 sentatives of a fourth cycle. 



Columella small, and often appearing trabecular, owing to its 

 union with the pali. 



Pali in one complete crown, and in some corallites irregular 

 representatives of a second crown occur. 



Distribution. — Uradu Limestone : Uradu, near the foot of the 

 Eugga Pass. Coll. Mrs. Lort Phillips. 



Affinities. — This coral may be easily distinguished from the 

 other Somaliland Columnastrcece by the small size of its corallites. 

 In this character it approaches C. striata (Goldf.), 2 the type of the 

 genus ; and that Turonian species also has traces of a fourth cycle. 

 C. Phillipsice differs, however, from C. striata by having the coral- 

 lites more crowded, less uniform in shape, the pali less regular, and 

 the septa of the different cycles less equal in size. 



1 This specimen, from south of Dobar, has a much altered corallum, the pali 

 are obscurely indicated in a few calices only, and the determination is doubtful. 



2 Astrcea striata, G-oldfuss, 'Petref. Germ.' pt. i (1829; p. Ill & pi. xxxviii, 



"'Q.J.G.S. No. 221, d 



