211 
visible in the marginal part, the central part of the lower surface 
of this corallum is only densely granulated (fig. 128). The central 
part of the oral surface of all specimens is markedly elevated round 
the axial fossa, the marginal part is much flatter. The septal edges 
are minutely dentated and granulated and the central parts of the 
chief septa are usually considerably thickened. Sometimes all septa 
are perforated, in other cases those of the lower cycles are solid; 
but on the whole the shape of the septa varies much in different 
specimens. The columella consists of a spongy mass of irregularly 
fused trabecula, 
Measurements of some comparatively regular specimens in mm: 
Greater 
diameter 
Lesser 
diameter 
Height 
Thickness 
round 
axial fossa 
168 
110 
80 
30 
132 
02 
69 
34 
121 
83 
45 
27 
110 
73 
39 
33 
87 
42 
30 
26 
As for its place among the other Fungiae this species seems 
to be allied to F. paumotensis. In this latter species there are some 
aberrant forms which present peculiarities as are found normally 
in F. moluccensis (cf. the description of these specimens in the 
following pages under F. paumotensis). On the other hånd F. moluc¬ 
censis has some resemblance to the specimens of F. cyclolites in 
which the thickened central part projects above the comparatively 
flat margin. Intermediate stages between F. cyclolites and F. moluc¬ 
censis >are found in the two species Fungia sibogae van der Horst 
and Fungia adrianae van der Horst. F. adrianae is characterized 
by its larger size and its strongly meandering costae, in all other 
respects it closely resembles F. cyclolites. On the contrary F. sibogae 
seems to be nearer allied to F. moluccensis. In F. sibogae the costae 
are provided only with very small spines, whilst in F. moluccensis 
the costal spines are usually well-developed. The upper surface of 
both forms is very similar, only the granulation of the septa is in 
most specimens of F. moluccensis more conspicuous than in F. sibogae, 
14 * 
