233 
developed in quite the same way as in young stages of circular 
Fungiae. In older specimens the septa are divided into so many 
Locality 
Greater 
diameter 
Maximum 
of lesser 
diameter 
Maximal 
height 
Number 
of calicles 
in axial 
furro w 
Banda 
43 
13 
8 
7 
» 
54 
11 
7.5 
7 
60 
11 
8 
12 
91 
12.5 
7 
20 
» 
96 
22 
12 
14 
Amboina 
125 
56 
19 
23 
Banda 
141 
25 
14 
25 
202 
47 
26 
32 
?? 
248 
28 
17 
52 
Amboina 
287 
73 
49 
— 
Doelah laut 
314 
97 
73 
— 
Amboina 
383 
100 
82 
Banda 
458 
55 
36 
75 
small pieces by the formation of the secondary mouths that the 
septal arrangement of the corallum presents little likeness to that 
of Fungia. 
Halomitra Dana 
The study of the specimen of Zoopilus echinatus Dana (probably 
the type-specimen) in the U. S. National Museum in Washington 
has convinced me that this form in its essential characteristics 
belongs to the genus Halomitra. Its structure proves that it is the 
most primitive form of this genus hitherto known. More peculiarities 
concerning this specimen will be found below under Halomitra 
echinatus. 
I include in this genus also the specimens belonging to Gar- 
diner’s genus Ddderleinia, which differ from the other species by 
their thickness and their rough, more or less ramified costal spines 
and strong granulation of both surfaces. These differences are 
of slight importance, in all essential characteristics these species 
agree with the other species of Halomitra, which have more or less 
smooth costal spines. Moreover Halomitra echinatus represents in 
