247 
The scar is strongly perforated, in somewhat older specimens the 
central part of the corallum soon becomes solid. 
The very young stages with few calicles (figs. 100, 102) strongly 
remind one of young Fungiae, they have the same arrangement of 
Greater 
diameter 
mm 
Lesser 
diameter 
mm 
Height 
mm 
Number 
of 
calicles 
47 
35 
17 
1 
54 
39 
15 
2 
53 
45 
14 
14 
58 
53 
26 
30 
61 
50 
22 
15 
64 
49 
15 
18 
the septa. In the first two specimens of the table six complete cycles 
of septa are present and some members of the seventh cycle. 
The two largest specimens in the collection are a strongly arched 
one from Amboina (fig. 107, length 358, breadth 225, and height 
123 mm) and a horizontally spreading one with irregularly devel- 
oped marginal part from Banda (fig. 108, length 385, breadth 276, 
and height 47 mm). 
When collecling the specimens I made a special search for 
colonies presenting phenomena of regeneration and lateral budding, 
and I succeeded in obtaining a large number of specimens of this 
kind. In regenerated specimens the septa of the new formed parts 
are directed in many places at right angles to those of the original 
fragment (cf. Gardiner 1909, PI. 39, fig. 28), but the general 
appearance of the corallum does not differ much from normal 
colonies. Usually the central calicle is not to be found in such 
regenerated colonies. 
Budding at the lateral surface (the lower surface) of this species 
was first described by Gardiner in his type-specimen of H. 
irregularis which possesses at its lower surface two stages of these 
buds (cf. Gardiner 1898, PI. 43, fig. 2). In my material there 
are also a number of colonies showing the formation of these buds 
and owing to the very small size of some of them they undoubtedly 
have been formed at the lower surface and are therefore true 
I 
