229 
also in the synonymy of his Madrepora Umax. From his description, 
however, clearly results that Esper’s Madrepora Umax is based 
on specimens closely agreeing with Ellis and Solander’s 
Madrepora pileus, and that Madrepora Umax Esper therefore only 
includes specimens of the present genus Herpolitha. 
As may be concluded from the foregoing comparison of the 
older literature, van der Horst’s suggestion that Esper’s species 
has a right to the name Herpolitha pileus cannot be maintained, 
for the name pileus was originally only confmed to specimens 
resembling Rumphius’ „Mitra polonica“, which was a represen¬ 
tative of the present genus Halomitra. 
During the Danish Expedition to the Kei Islands I paid special 
attention to the collecting of the very young stages of the Fungids, 
and I succeeded in obtaining by the help of a native diver in the 
Banda Islands a number of small specimens, some of which have 
not yet developed secondary calicles. The dimensions of the smallest 
specimens are in mm: 
Greater 
diameter 
Lesser 
diameter 
Thickness 
of central 
part 
Number 
of calicles 
24 
17 
5 
1 
29 
18.5 
5 
1 
29.5 
22 
6 
2 
33 
22.5 
6 
1 
33 
23 5 
7 
1 
50 
23 
8 
5 
53 
27 
9 
5 
55 
28 
8 
3 
58 
27 
7 
4 
61 
34.5 
8.5 
4 
All these specimens possess a definite scar of detachment with 
a diameter of 4 to 7 mm. The smallest specimens closely resemble 
a young Fungia with an enlarged greater diameter (figs. 78—85). 
In the first specimen of the table there are five complete cycles 
of septa and besides a number of septa of the higher cycles, which 
are yet incomplete. Between the two lateral septa of the first cycle 
the septa of the higher cycles develop in quite the same way as 
