240 
of this young specimen are: length 61, breadth 55, height 21, 
thickness of marginal part 4—5 mm. 
The measurements of the larger specimens with central calicle 
are given in the following table: 
Locality 
Greater 
dici meter 
mm 
Lesser 
diameter 
mm 
Heij^ht 
Banda 
123 
119 
49 
182 
195 
190 
Amboina 
206 
205 
97 
Banda 
235 
227 
73 
>5 
238 
235 
190 
yj 
245 
230 
130 
yj 
296 
293 
145 
The thickness of the corallum varies between 7 and 15 mm. 
The colonies of Halomitra philippinensis may grow out to a much 
larger size, one specimen which doubtless belongs to the same 
species measures 56 cm in diameter (cf. Mortensen 1923 p. 77). 
It has regenerated from a fragment but has a very regular shape. 
All the larger specimens in my material have an arched form, 
some are very high in comparison with the diameter of the mar¬ 
ginal part, e. g. the second and the fifth specimen of the table. 
The figured larger specimens present the following peculiarities: 
One arched specimen (fig. 105) has a very large central calicle 
and secondary calicles arranged in more or less circular rows. 
The secondary calicles project somewhat above the neighbouring 
parts. Another specimen (fig. 106) is regularly arched, the central 
calicle is less distinet, though easily to be distinguished from the 
secondary calicles. These latter project only very little above the 
neighbouring parts and they are more crowdedly distributed over 
the upper surface. A third specimen (fig. 111) is much higher than 
broad, it has a large central calicle and very little projecting secon¬ 
dary calicles. There are comparatively few calicles in this colony. 
The fourth specimen (fig. 118) is much flatter than the three preceding 
ones, it has a large central calicle and its secondary calicles, of 
which there are a great number, considerably project above their 
neighbourhood. 
