24 
central area, composed of talDulm, usually vesicular, but sometimes complete 
— wlieii incomplete the vesicles arc large, low, and directed upwards — the 
marginal vesicles much bent downwards at their junction with those of 
the interlocular area, and thus assisting to form the so-called inner mural 
investment ; when viewed horizontally this space has the appearance of a 
tabulate area, and the primary septa impinge somewhat on it. Possula 
slightly longer than the primary septa, the cardinal septum very short, 
and the counter septum not specially developed. Epitheca thin ; rugrn 
corresponding to the interseptal loculi. 
Obs. — The definite tripartite division of the corallum assigns this 
coral at once to the Clisiophyllidie, whilst the development of a talmlate 
central area, representing the pseudo-columellarian mass of other members 
of the family, with the inner mural investment, indicates, to my mind, 
the genus Aulophijllum, Edwards and Haime, as emended l)y Euncan 
and Thomson. 
The broken concentric lines visible on the central tabulate area, at first 
sight, partake, to some extent at least, of the characters of the spirally- 
twisted plates forming the centred mass of CUsiophyllmn, Rhodophyllum, 
lYih lino pliy Hum, and other members of the family; but a glance at a vertical 
section (El. XI, Eig. 3) will at once dispel this idea, and show that these 
lines arc simply the cut or broken edges of vesicular tabulae, the specimens 
having been more or less compressed laterally. 
Erom Aiilopliyllum JEdioardsi, E. & T., the type of the genus, our 
species is distinguished by its much greater size, less number of septa, and 
relatively wider areas. 
A. Davidis is named in honour of Mr. T. W. Edgeworth Eavid, B.A., 
of the Geological Survey. 
Locality and Horizon . — Binge Berry, liouchel Brook, Hunter lliver, 
Co. Eurliam ((7. Cullen) : — Horizon doubtful, but prol)ably Carboniferous. 
Torryburn, Logan’s Station, twelve miles from Paterson, Co. Eurham 
{Uev. IV. II. Yarrington, 31. A.) : — Horizon ditto. 
