A. deeatur@ns.is (6) 
ence to a plan© of symmetry* There is some variation from the 
following plan hut it apparently expressed the fundamental 
condition. At one end of the callce is a solitary directive, 
the opposite direction forms part of a triplet, a smaller septum 
fusing to each aide of it. Between the solitary directive and 
the directive-triplet there is on each side three pairs of 
septa; two pairs, these next the directive-triplet, are fused 
into a quartet group by the prolongation of the outer septa of 
the group. The accompanying diagram exhibits these relations. 
The actual details here given do not occur in all calices, but 
the presence of a directive plane and the grouping of the septa 
into pairs, with an occasional triplet is characteristic* Pali 
occur at the junctions of the inner ends of the septa - there 
are at least 5, The interseptal loculi are quite open, if any 
synapticula are present, they are very rare. 
Columella quite well developed, composed of septal pro- 
cesses 
