213 
former specimen, and the septa are arranged around them in quite 
the same manner as in Halomitra. The axial fossa of the mother- 
corallum has also lost its usual form; it has divided itself into 
six parts, some of the septa on either side of the corallum having 
fused across it. Four of the six secondary mouths that are derived 
directly from the original axial fossa, though being easily recognis- 
able, are but little larger than the secondary mouths that have 
arisen between the septa of the mother-corallum. In this specimen 
the occurrence of the secondary mouths can still be explained as 
an abnormally developed condition of a formerly simple Fungia. 
If the development of secondary calicles had gone faither so as 
to divide the old axial fossa into even more parts, the specimen 
could not have been recognized as a Fungia and would have to 
be classified among Halomitra. The way of transition of Fungia 
into a form greatly reminding of Halomitra is in this special case 
a very irregular one. In the young stages of Halomitra the central 
calicle is much less elongated and does not divide itself into 
smaller ones. The new calicles develop by budding between the 
central calicle and the margin of the corallum. It is a very 
remarkable faet that in this specimen of Fungia moluccensis by the 
United action of fission and budding a compound corallum has 
been formed, in which the distribution of the calicles over the 
oral surface strongly resembles that found in Halomitra, whilst in 
this latter genus all calicles develop by budding. 
There is one more specimen in the collection in which the 
derivatives of the former axial fossa and the secondary calicles, 
formed at the sides of the elevated central portion of the corallum, 
are all approximately of the same size. This specimen, however, 
bears on the whole less resemblance to Halomitra than that of 
fig. 76.' Around each of the secondary mouths the septa are clearly 
arranged in a radial manner and the calicles are larger than in 
the specimen described above. In another specimen there are two 
mouths of about equal size, separated by somewhat irregular small 
septa. Probably the two mouths are the result of fission of the old 
axial fossa into two halves. 
One small specimen consists of two individuals fused with the 
central part of their aboral surface. On one side of the compound 
corallum the septa belonging to one individual pass gradually into 
