187 
the living parts of large specimens in which the mouth and its 
surroundings were destroyed. The further development of these 
buds took place in quite the same way as in normally developing 
anthoblasts and, therefore, we may assume that also the very young 
anthoblasts of F. fungites which have developed from planulae have 
only six septa. Moreover the specimens described by Gardiner 
aS' Cycloseris hexagonalis do not in reality belong to this species. 
I have examined a number of Gardiner’s specimens and as I 
already pointed out elsewhere (1923 c) these have to be placed in 
Ddderlein’s repanda-gTOup. Therefore from none of the species 
of the former genus Cycloseris (i. e. the patella-group) the youngest 
stages are till now described. Fortunately I have in my material 
a large amount of specimens with very young buds, belonging to 
two species of the patella-group, viz. Fungia hexagonalis and mar- 
ginata, and in each of these two the first six septa develop before 
the septa of the second cycle make their appearance. The development 
of the first cycles of septa therefore presents no difference between 
' Cycloseris and Fungia. 
Ofteri specimens of Fungia echinata are found in which the 
axial fossa has been divided into several components which results 
in the formation of a colonial corallum. These specimens have 
developed abnormally, for as a rule F. echinata is a simple form 
and therefore there is no reason to separate these compound spe¬ 
cimens from it as representatives of another genus. Also in other 
species budding or fission gives often rise to a quite unusual form of 
corallum. In the following pages some compound coralla are described 
amongst the species of Fungia, but all these are abnormal repre¬ 
sentatives of a species which usually has a simple mouth (cf. F. 
fungites and F. moluccensis). It is, however, quite a different case 
when from a certain species only compound adult coralla are known. 
In this case the colonial form is a feature inherent to the species 
and it must then be classified in another genus. Therefore in this 
paper the species Herpolitha {Fungia) simplex Gardiner and Fungia 
weberi van der Horst are placed in the genus Herpolitha on account 
of the faet that their axial fossa has undergone fission by the fusion 
of pairs of opposite septa across it. 
For the greater part of the species of Fungia I have not given 
the complete list of synonyms; these are, however, to be found 
