284 
is thus subdivided into a large number of chambers, which are 
repeated symmetrically in the systems. One of my specimens, 
which has the upper margins of the septa worn down to the 
level of the synapticule, shows this structure of the calice very 
clearly. In his description of Stephanophyllia complicata, a 
recent species, Moseley calls attention to an analogous sym- 
metrical arrangement of closed calicular chambers formed jointly 
by curved septa and synapticular processes.* As another 
instance I may quote S. elegans, Michelin, from the Italian 
Miocene. 
The columella is elongate, papillary, and not very conspicuous. 
From a dissected specimen I judge it to be a fairly compact 
structure reaching to the base. Some of the secondary septa are 
joined to it in the specimens examined, but not the primary, 
which are, superficially at least, separate from it. Pali are not 
present. 
The undersurface, or wall, is very slightly concave and barely 
projects beyond the superimposed crown-like calice. The coste- 
are thin, finely granular, well raised ridges, which radiate 
regularly from the centre to the circumference. At the central 
point a few eoste are irregularly fused together, but these 
immediately bifurcate, and so on successively till at the margin 
there are 96, or 16 in each system. Here they alternate with 
the septa, and extend just beyond them. 
The whole undersurface of the corallum is fenestrated by stout 
transverse bars alternating with approximately circular holes 
arranged in regular series in the interspaces of the coste. These 
openings or pores are largest at the margin and gradually 
diminish in size towards the centre. About 20 concentric rows 
of pores were counted in the large specimen figured. 
Diameter of base, 11 mm.; height of corallum, 5 mm. 
Locality — Eocene, Spring Creek, 13 miles south of Geelong, 
Victoria. Five fairly perfect specimens and a fragment of a 
sixth. 
The three species next to be described cannot be placed in any 
established genus. They possess the porous wall of the 
Eupsammide, but are defective in the incurving and _ lateral 
junction of the septa generally characteristic of that family. In 
some respects, and especially in the irregular development of 
their septa, they approach Milne-Edwards and Jules Haime’s 
genera Leptopsammia and ndopsammia, each of which was 
founded upon a single recent species. They stand apart, how- 
ever, from both, and I class them under the following new 
genus :— 
* Challenger Reports, Zoology, vol. I., pp. 198-201. 
