70 
bellum. The specimens are often much worn, and the epi- 
theca then becomes almost or quite smooth. The coste are 
very faintly marked as parallel lines beneath the epitheca. 
The calice is shallow and either circular or just elliptical. 
The septa are slender, minutely porous, and sparingly granu- 
lar. They are in six systems with four cycles, which are ar- 
ranged on the same plan as those of the species just describ- 
edi The calice illustrated belongs to the tallest example 
collected, and has only two of its systems complete; in two 
others the higher orders are partially developed, while in the 
remaining two they are wholly wanting. The columella is 
moderate in size, spongy, and longitudinally placed. 
Diameters of calice, 7 mm. and 65 mm. Height of coral- 
lum figured, 17 mm. The tall individual mentioned has a 
height of 25 mm., but though its calice is well preserved, the 
epitheca is much worn, and in places entirely removed, the 
porous wall beneath being thus exposed. 
Locality, ete.—Eocene. Spring Creek, near Geelong, 13 
examples; Cape Otway, 2 examples; Wilkinson’s No. 4, 1 
example. Those from the two last mentioned localities and 
one from Spring Creek are much smaller than the rest. 
This species is distinguished from the preceding by its 
complete epitheca. It is also of more slender habit. 
Balanophyllia fossata, spec. nov. Pl. xxv., figs. 2a, b. 
The corallum is moderately long, curved, conico-cylindri- 
cal, and regularly tapering to a small pedicellate base. The 
wall is porous, granular, and stout. It is encircled by a 
partial epitheca, which is banded and occasionally raised in 
growth ridges. Towards the base the epitheca is stronger 
and more persistent than in the superior portions of the 
corallum. The costæ are either faintly marked, or, as in the 
type, barely traceable on the wall. 
The calice is slightly elliptical, very deep, and has a broad 
margin. At the bottom of the central fossa, which in the 
well preserved calice figured is narrow as well as deep, a 
small, delicate, spongy, and longitudinally placed columella 
is just perceptible. The septa are minutely granular, and 
in six systems with four cycles. All are slender, but the 
primaries, secondaries, and also the tertiaries below their 
junction with the higher orders are rather stouter than the 
rest. The higher orders are absent in one half-system of 
the type calice, but are otherwise regularly developed. They 
slope rapidly ‘downwards, and, bending towards the terti- 
aries, join them at about one- third from the margin. Below 
this junction the tertiaries increase in size, and, passing be- 
yond the first two orders, descend abruptly in the fossa. 
