13 
ZaPERENTIS (PlEROPHTLLUE ?) CULLENI, Sp. 710V. 
PI. IX, Pigs. 1-7. 
Sp). Chm '. — Coralliim small, slender, and corniite in a greater or less 
degree, sometimes slightly tnrhinate; base sharp and pointed, at times 
slightly constricted and the extremity becoming appendage-like ; growth 
accretions nnmerons at irregular distances apart, and sometimes ill-defined. 
Calice deep, circular ; month probably horizontal, or strictly at right angles 
to the growth. Septa twenty-two to twenty-fonr, primary and secondary, 
the former large and passing to the centre, where they become lost on a small 
tahulum, the latter thorn-like, short, and peripheral ; stereoplasma greatly 
developed ; dissepiments apparently absent ; fossnla not distingnishahle. 
Rugae fine and regular, but to some extent obliterated by the regular 
epitheca, which is thick and concentrically striate. 
Ohs . — This little coral is very characteristic of the Ronchel Brook 
beds, and ajipears to be nndescribed so far as Australian species are concerned. 
It is named after Mr. Charles Cullen, Collector to the Geological Survey, as 
an acknowledgment of his services in collecting material for the elaboration 
of this Memoir. 
The form of the corallnm in Z. Oidleni varies from gently cornnte 
to nearly straight, but one extreme case has been observed where the 
curvature of the corallum Avas acute (PI. IX, Pig. 1). The base is always 
sliarp, rendered so usually by a sudden diminution in size of the corallum, 
imparting to the base a minutely petiolate or appendage-like appearance. 
There is a well-marked epitheca which more or less obliterates the sharpness 
of the costae. A considerable development of stcreoplasma takes place 
around each septum individually, but on one side of the corallnm this is 
much greater than the other, tending to obliterate many of the remaining 
features of the calice. Dissepiments appear to bo wholly wanting, although 
loculi are left between the stereoplasmically-thickened septa; nor have I 
been able to detect a fossnla Avith certainty. 
The late Prof, de Koninck referred a single small coral from Colocolo 
to the well-knoAAui European species Zaphi^entis I^hilUpsi, Ed. and II., AAutli 
some doubt. The number of septa described in this specimen totally forbids 
its reference to the European form, and there is the possibility of its identity 
