22 
A section taken immediately above the base of the calice shows a 
small central space (PL X, Pig. C), to which the septa have not converged, 
whilst in another taken somewhat lower in the coralliim they appear to be 
gathered together on a small tabulate area, and there is also an indefinite 
subdivision into gronjis (PI X, Pig. 5). The development of stereoplasma 
ahoiit the outer ends of the sejita and the peripheral dissepiments gives rise 
to the appearance of a well-marked zone (PI. X, Pigs. 5 and G). 
LocalUij and Horizon . — Binge Berry, Bouchel Brook, Hunter Biver, 
Co. Durham {C. Cullen): — Horizon doubtful, but probably Carboaifeous. 
CyATIIOPHYLLUM IlETIFORME, Sp. nOV. 
PI. X, Pigs. 13-15. 
Sp. Char . — Corallum simple, cylindro-conical, straight, tapering very 
slowly; section oval or circular. Septa fifty-eight, with an equal numher of 
secondary lamellre, the former proceeding direct to the centre, although here 
and there a little curved ; secondary lamclhc about half the length of the 
primary septa, very regular in size, length, and apj)earancc, both more or less 
thickened with stereoplasma ; dissepiments irregular in size and direction, 
forming Avith large and corresponding vesicles an outer zone; in an inter- 
mediate area between the thickened portions of the septa, the dissepiments 
are very short and small, the A'esicles small and generally quadrangular, 
producing a more or less retiform appearance, Avhilst heyond the ends of the 
secondary lamelhn the dissepiments are less in number, distant, and direct, 
with oblong and narrow A^esicles ; stereoplasma thickening the septa but not 
infilling the loculi. Tabulate area small, and probably undulating or er'cn 
A'esicular. 
Ohs . — Although but an imjAerfect specimen the minute structure of 
this coral is so different from any other Australian Cyathophyloid that I feel 
called upon to name it as a memorandum for further investigation. There is 
an exterior zone of vesicular tissue in which the A^csieles are moderately 
large and A^ery irregular, practically forming the theca ; internal to this is an 
intermediate area in which the secondary septa play their part. Here the 
A^esicles are small, more or less quadrangular, bounded by direct dissepiments, 
producing a marked nct-like appearance AAdiich is constant at A'arious levels 
throughout the corallum. HTien seen in polished section on the specimen 
