223 
genus Fiingia. They represent more or less intermediate forms 
between the species of the genus Fiingia and Herpolitha Umax, 
From this latter species they differ in having no secondary calicles 
on the lateral parts of the disc^). The two species have to be 
classified in the genus Flerpolitha on account of the division of 
their fossa into secondary calicles. 
In many species of Fungia the axial furrow is sometimes divided 
into separate secondary calicles, but these specimens are only 
abnormal forms of a species in which as a rule there is only one 
mouth. The two species dealt with below are, besides some young 
specimens of FI. simplex, only known in the colonial form. They 
differ in constant characteristics from the species of Fungia and 
also from Flerpolitha Umax. 
Herpolitha simplex Gardiner. 
(Plate VII, figs. G8-70j. 
Herpolitha simplex Gardiner 1905. 
Fungia simplex Gardiner 1909. 
Herpolitha simplex Folkeson 1919. 
Fungia echinata \ar. parvispina van der Horst 1921. 
Locality: D. Exp. t. Kei I si.: Banda, 0—14 m, 8 ex. 
Among my material there are eight specimens which 1 first 
thought to be representatives of Fungia echinata, but which differ 
from this species by their having much smaller costal spines (fig. 
69). Excepting the three youngest specimens these coralla with minute 
spines all have the axial fossa divided into secondary calicles by 
the fusion of opposite pairs of septa. In Fungia echinata this 
division' of the original mouth into two or more parts is also often 
found, especially in larger specimens, but in these specimens with 
a quite different structure of the lower surface the colonial form 
seems to be constant in the adult stage. As in F. echinata there 
are a large number of prominent septa which alternate with one 
or more septa of lesser height. These less prominent septa are in 
F. echinata as a rule very thin, whilst in the eight specimens from 
Banda they are strongly granulated and appear therefore much 
thicker. 
9 In Herpolitha weberi the very First traces of the formation of secon¬ 
dary calicles on the lateral parts of the disc are visible (cp. below). 
