242 
this specimen there are seven buds, one of which is attached to 
the lateral surface of an older one. The youngest stage (fig. 121) 
is already clearly stalked, but its uppermost part has not yet 
enlarged. In the course of further development the stalk becomes 
longer and the marginal part of the bud broadens. The largest bud has 
a conical form, its upper surface is deeply hollowed and at the bot- 
tom several calical centres are to be seen. The shape of these 
buds is quite different from that of young specimens of Halomitra 
which have developed from planulae, these latter are much thinner 
and much flatter than the lateral buds. A further difference is 
found in the arrangement of the septa: in the lateral buds these 
are fairly radially arranged but the different cycles cannot be distin- 
guished with any certainty, whilst in normal young specimens of 
Halomitra these are easily found. 
Some colonies were found lying upside down on the bottom. 
This abnormal situation has caused a reversed mode of growth of 
the marginal part, which has folded towards the lower surface of 
the corallum and now the septal faces of the new part of the 
corallum are turned again towards the light (fig. 1 19). This folded 
marginal part had already reached a fairly large size, the coralla 
had therefore already been in the reversed condition during some 
time. Notwithstanding that they were on the whole in a healthy State. 
Halomitra robusta (Quelch). 
(PI. VIII, figs. 99-104. PI. IX, figs. 107, 108, 112-116, 120, 122, PI. X, figs. 130- 133). 
Podabacia robusta Quelch 1886. 
Halomitra irregularis Gardiner 1898. 
Podabacia irregularis Studer 1901. 
Podabacia robusta Studer 1901. 
Podabacia robusta Bedot 1907. 
Ddderleinia irregularis Gardiner 1909. 
Ddderleinia robusta Gardiner 1909. 
Ddderleinia robusta van der Horst 1921. 
Ddderleinia irregularis van der Horst 1921. 
Ddderleinia sluiteri van der Horst 1921. 
Localities: D. Exp. t. Kei I si.: Amboina, 0—2 m, 2 ex.; Doelah laut, 
Kei Islands, reef, 1 ex.; Banda, 0—25 m, 59 ex. 
The study of the comparatively large collection of specimens 
in my material belonging to Gardiner’s genus Ddderleinia com- 
