283 
Height of corallum, 5 mm.; length of calice, 3 mm.; breadth 
of calice, 2 mm. 
Localities. —Kocene; Shelford (type) and Muddy Creek, 
Victoria. 
GENUS STEPHANOPHYLLIA. 
Stephanophyllia implexa, spec. nov. Pl. x., figs. la, }, ¢, d. 
The corallum is free, circular, and in shape like a crown, with 
convex upper surface and sub-plane base. 
_ The septa rise almost vertically from the basal margin, and 
then arch round to a small, shallow, and elongate fossula. They 
are in six systems, with five complete cycles. The primaries are 
free and reach almost to the columella; two of them are in a 
line with this and straight, but the other four curve slightly from 
it just at their inner extremities. The secondaries are also 
straight, and equal in length to the primaries; at about three- 
fourths from the margin they are fused with the tertiaries, either 
directly or by means of synapticular lamine ; for the remaining 
one-fourth of their length their upper margins are lobed and 
deeply notched. The other orders of septa are straight for a 
short distance from the margin, but then describe a remarkable 
‘series of curves, each cycle finally uniting with that of the order 
immediately preceding. The tertiaries curve gently towards the 
secondaries but, before actually uniting with them, bend round 
and run parallel with them for some distance. The two 
‘quaternaries in each half system are unequal in length, that 
nearest the primary being much longer than the other. Both 
bend from side to side, and describe an irregular triple curve 
before joining the intervening tertiary at distances corresponding 
to their lengths. The quinaries curve towards and join the 
quaternaries, but in each half system all four differ in length. 
The first and third in order of length unite with the longer of 
the two quaternaries, and the second and fourth with the shorter. 
In the case of both sets of quinaries the shorter of the two is 
that adjacent to the tertiary septum. Near the wall the septa 
are slender and equal, but become stouter medially. Their 
upper margins are strongly serrated by a regular series of trans- 
verse granular projections with alternating shallow notches. The 
serrations are not confined to the edges of the septa, but can be 
traced vertically downward for a short distance till they 
gradually cease. 
Not only are the septa from the second to the fifth, or highest 
order, connected in the manner described by a series of tortuous 
curves, but the chambers so formed are usually closed at their 
outer ends by synapticular processes which unite adjoining lamine 
where the intervening spaces are narrowest. The whole calice 
