114 
correspond to the three first orders of septa. There are no coste 
of the fourth order. The ridges which constitute the lateral 
costz are larger than the others, and can be traced almost to the 
terminal pedicel ; two or three of those on the middle of the faces 
reach as far, but the remainder are successively cut off by the 
lateral slope of the cone. All become less conspicuous as they 
approach the base. 
The epitheca is strong aud continuous on the surface of the 
corallum ; it forms a transverse ornament of wavy lines both on 
the coste and their interspaces. 
Height, 30 mm.; length of calice, 18 mm.; breadth of calice, 
10 mm. 
Locality.—Rare in the Eocene cliffs at Spring Creek, 14 miles 
south of Geelong, Victoria. 
Flabellum curtum, spec. nov. PI. iii., fig. 3 a, b. 
The corallum is compressed, especially inferiorly, and in outline 
almost an equilateral triangle, of which the upper margin repre- 
sents the base, and the short swollen pedicel the apex ; its lateral 
borders are gently rounded. The calice is shallow and elliptical, 
the ratio of the axes of the ellipse being as 100 to 52; the plane 
of the shorter axis is considerably higher than that of the longer, 
and the summits of the faces are consequently much arched. 
The septa are granulated, slightly curved, and faintly waved 
on their upper margins. They are in six systems, with five 
cycles, four only of which are developed in the end systems. 
Fach of the latter contains two principal septa, viz., the primary 
and either the secondary or one of the tertiaries; the higher 
orders are present, but correspondingly few in number. The half 
calice figured shows only two quinaries in the end systems instead 
of four, none being developed on either side of the quaternaries 
which flank the middle system. In other calices examined the 
quinaries are present in these spaces, but are wanting on the 
sides of the adjoining quaternaries at the extremities of the 
middle system. For the three systems figured there are 28 septa, 
or 56 for the entire calice. The primaries, secondaries, and 
tertiaries are stout and equal, and bound a moderately broad and 
deep axial fossa; the quaternaries are nearly as long, but much 
thinner, while the quinaries are still smaller and very short. The 
inner margins of the principal septa are.vertical in the fossa and 
strongly wrinkled; they are free for a considerable distance 
down, and then unite by stoutish, twisted processes to form a 
rudimentary columella. 
The cost are marked on the surface by broad rugose bands 
with narrow interspaces, and radiate from the pedicel to the 
arched margin. They are of equal width for their inferior two- 
