K0.1526. CORALS FROM FRENCH 80MALILAND—VAVGHAN. 263 



ing- corallum. As Bernard attaches no specific names to the forms 

 described by him, the one here proposed will stand, even if it should 

 be synonymous with one of his. 



GONIOPORA DJIBOUTIENSIS, new species. 

 Plate XXVI; Plate XXVII, tig. 2. 



Corallum rounded on the upper surface, transverse outline irregu- 

 lar, somewhat reniform; corallites rising from a small base, diverging 

 upward, new corallites appearing in the angle between the older ones. 

 The basal portion throug-h a distance of from 44 to about 75 mm., 

 depending upon where measured, is dead, and the epitheca, should it 

 once have been present, has been eroded awa}'. The edge of the liv- 

 ing portion in places slightl}^ projects downward over the dead portion, 

 in other places it is flush with the dead. The projecting living edge 

 is supported b}^ epitheca; that part of the living portion flush with 

 the dead is margined by epitheca. The epitheca is irregularh' and 

 flneh" wrinkled. 



Dimensions of the corallum: Height, 104 nmi.; greater transverse 

 diameter, 131 mm.; lesser, 29 to 75 mm. 



Calices subpolj^gonal or circular in outline; shallow, superficial to 

 1.5 mm. deep; fully grown ones, 5 to 5.5 mm. in diameter. The walls 

 have a rough upper surface, about 1 mm. across, formed b}' the outer 

 ends of septa. 



Septal formula complete, 24 septa, with the typical gonioporid 

 arrangement. Interseptal loculi open, in width equaling or slightly 

 exceeding the thickness of the septa. Septal faces roughly granulate; 

 margins with several dentations corresponding to inwardly inclined, 

 ascending trabecule. About six pali in the superficial calices; indis- 

 tinct or absent in the deeper ones. 



Columella tangle large, more than half the diameter of the calice, 

 extending outward to the inner ends of the tertiary septa; composed 

 of concentrically arranged synapticula and fused inner ends of the 

 septa; upper surface roughly spinulose. 



Ty2?e. — Museum cFHistoire Naturelle, Paris; a piece in the United 

 States National Museum. 



GONIOPORA STOKESI Milne-Edwards and Haime. 



Plate XXVIII, figs. 1, 2. 



1860. Gimiopora ?tokei<i Milne Edwards, Hist. nat. Corall., Ill, p. 192. 



Corallum forming masses that are hemispherical or domed above; 

 base epithecate, flat, concentrically corrugated, concave, or, in the 

 largest specimen obtained, truncate and inversely conical. The living 

 portion is hemispherical or domed. 



