DESCRIPTIONS OF NEW SPECIES OF CORALS FROM THE 
AUSTRALIAN TERTIARIES. 
Ву J. Dennant, F.G.S. 
[Read October 4, 1904.) 
PART VII. 
¡PRATES ANIN TO KKV. 
FAMILY TURBINOLIDÆ. 
GENUS FLABELLUM. 
Flabellum medioplicatum, spec. nov. РІ. xxii., fig. 2. 
The corallum is compressed, especially towards the base 
and at its lateral edges; these edges are crested, not only 
inferiorly, as in its near ally, F. distinctum, but also 
superiorly. Тһе most characteristic feature of the coral is a 
strong medial plication on its anterior and posterior surfaces. 
This commences at the base, and becomes gradually broader 
and stronger as it ascends on the sides of the corallum. The 
base is prolonged into a straight tapering pedicel, which at 
the point shows a mark of former attachment. Тһе whole 
surface is covered with a strong epitheca, which is crossed by 
several well marked transverse bands. These bands are 
convex and most prominent on the upper portions of the 
medial plications, where they form a series of crested ridges. 
Beneath the epitheca the costae are traceable as numerous, 
faint, and closely packed projections, broad at the summit 
of the corallum, but gradually narrowing as they reach the 
base. The central ones are straight, and continue to the 
extremity of the peduncle; the rest converge towards this 
point, but at the same time curve gently inwards. The wall 
is thin and thus easily fractured during fossilization. Owing 
to this the specimens obtained are all more or less imperfect. 
The calice describes two convex curves which meet sharply 
at the lateral edges. Its major and minor axes are approxi- 
mately as 100 to 56. Іп the type specimen one half of the 
calice is fairly well preserved and shows 50 septa, or 100 
for the whole calice. On its medial boundaries the septa 
are apparently arranged in three orders, of which the first 
is fairly stout, and reaches to the central fossula, the second 
thinner and nearly as long, with the third very slender and 
much shorter. Towards the lateral edges the septa become 
alternately long and short. 
The columella is rudimentary and deeply placed in the 
narrow fossula. 
